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Document And Entity Information (USD $)
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6 Months Ended | ||
|---|---|---|---|
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Jun. 30, 2013
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Aug. 05, 2013
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Jun. 30, 2012
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| Entity information [Abstract] | |||
| Entity Registrant Name | Great Plains Energy Inc | ||
| Entity Central Index Key | 0001143068 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Public Float | $ 3,273,153,264 | ||
| Entity Common Stock, Shares Outstanding | 153,782,529 | ||
| Document Fiscal Year Focus | 2013 | ||
| Document Fiscal Period Focus | Q2 | ||
| Document Type | 10-Q | ||
| Amendment Flag | false | ||
| Document Period End Date | Jun. 30, 2013 |
| X | ||||||||||
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- Definition
If the value is true, then the document is an amendment to previously-filed/accepted document. No definition available.
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| X | ||||||||||
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- Definition
End date of current fiscal year in the format --MM-DD. No definition available.
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| X | ||||||||||
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- Definition
This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY. No definition available.
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| X | ||||||||||
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- Definition
This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. No definition available.
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| X | ||||||||||
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- Definition
The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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| X | ||||||||||
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- Definition
The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other". No definition available.
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| X | ||||||||||
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- Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. No definition available.
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| X | ||||||||||
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- Definition
Indicate "Yes" or "No" whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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| X | ||||||||||
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- Definition
Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated) or (5) Smaller Reporting Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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| X | ||||||||||
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- Definition
State aggregate market value of voting and non-voting common equity held by non-affiliates computed by reference to price at which the common equity was last sold, or average bid and asked price of such common equity, as of the last business day of registrant's most recently completed second fiscal quarter. The public float should be reported on the cover page of the registrants form 10K. No definition available.
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- Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Indicate "Yes" or "No" if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. No definition available.
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| X | ||||||||||
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- Definition
Indicate "Yes" or "No" if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Sum of the carrying amounts of deferred costs for nuclear plant refueling outages that are expected to be recognized as a charge against earnings. No definition available.
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| X | ||||||||||
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- Definition
The total of investments and other long-term assets. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Period end amount of total net PPE in service No definition available.
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. No definition available.
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| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Items including common stock value, paid in capital, retained earnings, common stock purchased for the treasury and excluding noncontrolling interests (minority interests) and preferred stockholder interests. No definition available.
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| X | ||||||||||
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- Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of all Liabilities and Stockholders' Equity items (or Partners' Capital, as applicable), including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The carrying amount as of the balance sheet of nuclear fuel held as property plant and equipment. This amount is net of amortization based on the energy produced over the life of the fuel. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. No definition available.
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| X | ||||||||||
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- Definition
Period end amount of construction work in progress in public utility. No definition available.
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- Definition
Period end amount of total net PPE. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Period end amount of total gross PPE. No definition available.
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| X | ||||||||||
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- Definition
The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount at the balance sheet date of borrowings from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
|
| Utility Plant, at Original Cost | ||
| Nuclear fuel, amortization | $ 147.3 | $ 157.4 |
| Common shareholder's equity | ||
| Common stock - shares authorized (in shares) | 250,000,000 | 250,000,000 |
| Common stock-shares issued (in shares) | 153,894,724 | 153,779,806 |
| Treasury stock- shares (in shares) | 121,246 | 250,236 |
|
Cumulative Preferred Stock [Member] | Preferred Stock 3 Point 80 [Member]
|
||
| Cumulative preferred stock | ||
| Cumulative preferred stock par value (in dollars per share) | $ 100.00 | $ 100.00 |
| Cumulative preferred stock, Shares issued (in share) | 100,000 | 100,000 |
| Preferred Stock, Dividend Rate, Percentage | 3.80% | 3.80% |
|
Cumulative Preferred Stock [Member] | Preferred Stock 4 Point 50 [Member]
|
||
| Cumulative preferred stock | ||
| Cumulative preferred stock par value (in dollars per share) | $ 100.00 | $ 100.00 |
| Cumulative preferred stock, Shares issued (in share) | 100,000 | 100,000 |
| Preferred Stock, Dividend Rate, Percentage | 4.50% | 4.50% |
|
Cumulative Preferred Stock [Member] | Preferred Stock 4 Point 20 [Member]
|
||
| Cumulative preferred stock | ||
| Cumulative preferred stock par value (in dollars per share) | $ 100.00 | $ 100.00 |
| Cumulative preferred stock, Shares issued (in share) | 70,000 | 70,000 |
| Preferred Stock, Dividend Rate, Percentage | 4.20% | 4.20% |
|
Cumulative Preferred Stock [Member] | Preferred Stock 4 Point 35 [Member]
|
||
| Cumulative preferred stock | ||
| Cumulative preferred stock par value (in dollars per share) | $ 100.00 | $ 100.00 |
| Cumulative preferred stock, Shares issued (in share) | 120,000 | 120,000 |
| Preferred Stock, Dividend Rate, Percentage | 4.35% | 4.35% |
|
Kansas City Power and Light Company [Member]
|
||
| Utility Plant, at Original Cost | ||
| Nuclear fuel, amortization | $ 147.3 | $ 157.4 |
| Common shareholder's equity | ||
| Common stock - shares authorized (in shares) | 1,000 | 1,000 |
| Common stock-shares issued (in shares) | 1 | 1 |
| X | ||||||||||
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- Definition
Amortization based on the energy produced over the life of the fuel. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The percentage rate used to calculate dividend payments on preferred stock. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Consolidated Statements of Income and Comprehensive Income (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
||||
| Operating Revenues | |||||||
| Electric revenues | $ 600.3 | $ 603.6 | $ 1,142.5 | $ 1,083.3 | |||
| Operating Expenses | |||||||
| Fuel | 121.2 | 138.1 | 253.4 | 257.4 | |||
| Purchased power | 34.9 | 26.9 | 73.7 | 51.6 | |||
| Transmission of electricity by others | 12.9 | 8.8 | 24.3 | 16.1 | |||
| Utility operating and maintenance expenses | 166.4 | 164.1 | 321.6 | 327.2 | |||
| Depreciation and amortization | 72.6 | 67.9 | 142.8 | 135.3 | |||
| General taxes | 48.1 | 45.0 | 95.9 | 89.5 | |||
| Other General and Administrative Expense | 0.6 | 2.8 | 1.1 | 7.2 | |||
| Costs and Expenses, Total | 456.7 | 453.6 | 912.8 | 884.3 | |||
| Operating Income (Loss) | 143.6 | 150.0 | 229.7 | 199.0 | |||
| Non-operating income | 4.4 | 1.6 | 6.9 | 2.5 | |||
| Non-operating expenses | (2.2) | (5.8) | (3.5) | (7.6) | |||
| Interest charges | (49.4) | (55.8) | (99.1) | (122.7) | |||
| Income before income tax (expense) benefit and income (loss) from equity investments | 96.4 | 90.0 | 134.0 | 71.2 | |||
| Income tax (expense) benefit | (32.7) | (31.8) | (44.2) | (22.3) | |||
| Income (loss) from equity investments, net of income taxes | (0.1) | (0.1) | (0.2) | (0.1) | |||
| Net income (loss) | 63.6 | 58.1 | 89.6 | 48.8 | |||
| Less: Net income (loss) attributable to noncontrolling interest | 0 | 0 | 0 | 0.2 | |||
| Net income (loss) attributable to Great Plains Energy | 63.6 | 58.1 | 89.6 | 49.0 | |||
| Preferred stock dividend requirements | 0.4 | 0.4 | 0.8 | 0.8 | |||
| Earnings (loss) available for common shareholders | 63.2 | 57.7 | 88.8 | 48.2 | |||
| Average number of common shares outstanding (in shares) | 153.5 | 139.6 | 153.4 | 137.7 | |||
| Average number of diluted common shares outstanding | 153.8 | 142.0 | 153.7 | 140.6 | |||
| Basic earnings (loss) per common share | |||||||
| Basic earnings per share | $ 0.41 | $ 0.41 | $ 0.58 | $ 0.35 | |||
| Diluted earnings (loss) per common share | |||||||
| Diluted earnings per share | $ 0.41 | $ 0.41 | $ 0.58 | $ 0.34 | |||
| Cash dividends per common share | $ 0.2175 | $ 0.2125 | $ 0.435 | $ 0.425 | |||
| Comprehensive Income | |||||||
| Net income (loss) | 63.6 | 58.1 | 89.6 | 48.8 | |||
| Other comprehensive income | |||||||
| Gain (loss) on derivative hedging instruments | 0 | 0.1 | 0 | (0.2) | |||
| Income tax benefit (expense) | 0 | 0 | 0 | 0.1 | |||
| Net gain (loss) on derivative hedging instruments | 0 | 0.1 | 0 | (0.1) | |||
| Reclassification to expenses, net of tax | 2.9 | 3.1 | 6.1 | 6.2 | |||
| Derivative hedging activity, net of tax | 2.9 | 3.2 | 6.1 | 6.1 | |||
| Amortization of net losses included in net periodic benefit costs | 0.3 | 0.1 | 0.3 | 0.2 | |||
| Income tax benefit (expense) | (0.1) | (0.1) | (0.1) | (0.1) | |||
| Net change in unrecognized pension expense | 0.2 | 0 | 0.2 | 0.1 | |||
| Total other comprehensive income (loss) | 3.1 | 3.2 | 6.3 | [1] | 6.2 | ||
| Comprehensive income (loss) | 66.7 | 61.3 | 95.9 | 55.0 | |||
| Less: comprehensive income (loss) attributable to noncontrolling interest | 0 | 0 | 0 | 0.2 | |||
| Comprehensive income (loss) attributable to Great Plains Energy | 66.7 | 61.3 | 95.9 | 55.2 | |||
|
Kansas City Power and Light Company [Member]
|
|||||||
| Operating Revenues | |||||||
| Electric revenues | 410.8 | 409.1 | 777.5 | 736.1 | |||
| Operating Expenses | |||||||
| Fuel | 86.0 | 98.7 | 180.5 | 183.3 | |||
| Purchased power | 18.6 | 6.6 | 37.7 | 13.6 | |||
| Transmission of electricity by others | 8.8 | 6.1 | 16.8 | 11.1 | |||
| Utility operating and maintenance expenses | 116.7 | 115.9 | 224.9 | 233.8 | |||
| Depreciation and amortization | 49.6 | 46.0 | 97.2 | 91.7 | |||
| General taxes | 37.7 | 35.9 | 74.7 | 71.1 | |||
| Costs and Expenses, Total | 317.4 | 309.2 | 631.8 | 604.6 | |||
| Operating Income (Loss) | 93.4 | 99.9 | 145.7 | 131.5 | |||
| Non-operating income | 3.8 | 0.8 | 5.5 | 1.3 | |||
| Non-operating expenses | (1.2) | (2.7) | (1.6) | (3.4) | |||
| Interest charges | (31.5) | (31.3) | (63.5) | (63.7) | |||
| Income before income tax (expense) benefit and income (loss) from equity investments | 64.5 | 66.7 | 86.1 | 65.7 | |||
| Income tax (expense) benefit | (20.3) | (23.0) | (25.7) | (19.7) | |||
| Net income (loss) | 44.2 | 43.7 | 60.4 | 46.0 | |||
| Comprehensive Income | |||||||
| Net income (loss) | 44.2 | 43.7 | 60.4 | 46.0 | |||
| Other comprehensive income | |||||||
| Gain (loss) on derivative hedging instruments | 0 | 0.1 | 0 | (0.2) | |||
| Income tax benefit (expense) | 0 | 0 | 0 | 0.1 | |||
| Net gain (loss) on derivative hedging instruments | 0 | 0.1 | 0 | (0.1) | |||
| Reclassification to expenses, net of tax | 1.3 | 1.3 | 2.8 | 2.7 | |||
| Derivative hedging activity, net of tax | 1.3 | 1.4 | 2.8 | 2.6 | |||
| Total other comprehensive income (loss) | 1.3 | 1.4 | 2.8 | 2.6 | |||
| Comprehensive income (loss) attributable to Great Plains Energy | $ 45.5 | $ 45.1 | $ 63.2 | $ 48.6 | |||
|
|||||||
| X | ||||||||||
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- Definition
Equity component of Allowance for Funds Used During Construction and the aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. No definition available.
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| X | ||||||||||
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- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
|
- Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Cost incurred for transmission operations and maintenance by total kilowatt-hours paid to sources other than affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Total costs of sales and operating expenses for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
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| X | ||||||||||
|
- Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
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| X | ||||||||||
|
- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
|
- Definition
The aggregate revenue, whether regulated or unregulated, derived from the generation, transmission and distribution of electricity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
|
- Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
|
| X | ||||||||||
|
- Definition
Net of tax and reclassification adjustments amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
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| X | ||||||||||
|
- Definition
Net of tax and reclassifications amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Tax effect, net of reclassification adjustments, of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Before tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Before tax amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. No definition available.
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The amount of fuel used charged against earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Discloses the amount of operating expense for the period for routine plant maintenance, repairs and operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of purchased power charged against earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Cash Flows from Operating Activities | ||
| Net income (loss) | $ 89.6 | $ 48.8 |
| Adjustments to reconcile income to net cash from operating activities: | ||
| Depreciation and amortization | 142.8 | 135.3 |
| Amortization of: | ||
| Nuclear fuel | 8.7 | 9.1 |
| Other | 28.9 | 9.2 |
| Deferred income taxes, net | 45.5 | 26.8 |
| Investment tax credit amortization | (0.9) | (1.2) |
| Loss from equity investments, net of income taxes | 0.2 | 0.1 |
| Other operating activities | (139.4) | (62.8) |
| Net cash from operating activities | 175.4 | 165.3 |
| Cash Flows from Investing Activities | ||
| Utility capital expenditures | (339.8) | (263.4) |
| Allowance for borrowed funds used during construction | (4.6) | (2.7) |
| Purchases of nuclear decommissioning trust investments | (54.8) | (11.7) |
| Proceeds from nuclear decommissioning trust investments | 53.1 | 10.0 |
| Other investing activities | (13.1) | (7.5) |
| Net cash from investing activities | (359.2) | (275.3) |
| Cash Flows from Financing Activities | ||
| Issuance of common stock | 2.6 | 290.3 |
| Issuance of long-term debt | 412.5 | 0 |
| Issuance fees | (4.3) | (2.6) |
| Repayment of long-term debt | (9.3) | (13.4) |
| Net change in short-term borrowings | (151.1) | (167.0) |
| Net change in collateralized short-term borrowings | 1.0 | 67.0 |
| Dividends paid | (67.6) | (58.7) |
| Other financing activities | (1.4) | (4.9) |
| Net cash from financing activities | 182.4 | 110.7 |
| Net Change in Cash and Cash Equivalents | (1.4) | 0.7 |
| Cash and Cash Equivalents at Beginning of Year | 9.3 | 6.2 |
| Cash and Cash Equivalents at End of Period | 7.9 | 6.9 |
|
Kansas City Power and Light Company [Member]
|
||
| Cash Flows from Operating Activities | ||
| Net income (loss) | 60.4 | 46.0 |
| Adjustments to reconcile income to net cash from operating activities: | ||
| Depreciation and amortization | 97.2 | 91.7 |
| Amortization of: | ||
| Nuclear fuel | 8.7 | 9.1 |
| Other | 17.1 | 14.9 |
| Deferred income taxes, net | 25.6 | 20.2 |
| Investment tax credit amortization | (0.5) | (0.9) |
| Other operating activities | (93.2) | (26.1) |
| Net cash from operating activities | 115.3 | 154.9 |
| Cash Flows from Investing Activities | ||
| Utility capital expenditures | (261.2) | (208.6) |
| Allowance for borrowed funds used during construction | (4.1) | (1.4) |
| Purchases of nuclear decommissioning trust investments | (54.8) | (11.7) |
| Proceeds from nuclear decommissioning trust investments | 53.1 | 10.0 |
| Net money pool lending | (36.3) | 0 |
| Other investing activities | (8.3) | (6.3) |
| Net cash from investing activities | (311.6) | (218.0) |
| Cash Flows from Financing Activities | ||
| Issuance of long-term debt | 412.5 | 0 |
| Issuance fees | (4.3) | 0 |
| Repayment of long-term debt | (2.6) | (12.3) |
| Net change in short-term borrowings | (161.0) | (136.0) |
| Net change in collateralized short-term borrowings | 0 | 11.0 |
| Net money pool borrowings | (3.8) | 250.9 |
| Dividends paid | (46.0) | (50.0) |
| Net cash from financing activities | 194.8 | 63.6 |
| Net Change in Cash and Cash Equivalents | (1.5) | 0.5 |
| Cash and Cash Equivalents at Beginning of Year | 5.2 | 1.9 |
| Cash and Cash Equivalents at End of Period | $ 3.7 | $ 2.4 |
| X | ||||||||||
|
- Definition
Cash outflow due to change during the period in the allowance for other funds used during construction classified as an investing activity. No definition available.
|
| X | ||||||||||
|
- Definition
The noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of nuclear fuel over the operating cycle of the nuclear plant. No definition available.
|
| X | ||||||||||
|
- Definition
Net proceeds (payments) in money pool borrowings. No definition available.
|
| X | ||||||||||
|
- Definition
Net money pool lending No definition available.
|
| X | ||||||||||
|
- Definition
Total of increase or decrease in operating capital plus other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The charge against earnings in the period representing the allocation of deferred costs to periods expected to benefit from such costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow for the purchase of investments that will be held in a decommissioning trust fund. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from the sale of assets held in a decommissioning trust fund. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Consolidated Statements of Common Shareholders' Equity and Noncontrolling Interest (USD $)
In Millions, except Share data, unless otherwise specified |
Total
|
Kansas City Power and Light Company [Member]
|
Common Stock [Member]
|
Common Stock [Member]
Kansas City Power and Light Company [Member]
|
Retained Earnings [Member]
|
Retained Earnings [Member]
Kansas City Power and Light Company [Member]
|
Treasury Stock [Member]
|
Accumulated Other Comprehensive Income (Loss) [Member]
|
Accumulated Other Comprehensive Income (Loss) [Member]
Kansas City Power and Light Company [Member]
|
Noncontrolling Interest [Member]
|
|---|---|---|---|---|---|---|---|---|---|---|
| Beginning balance at Dec. 31, 2011 | $ 2,330.6 | $ 1,563.1 | $ 684.7 | $ 513.8 | $ (5.6) | $ (49.8) | $ (31.4) | $ 1.0 | ||
| Beginning balance (in shares) at Dec. 31, 2011 | 136,406,306 | 1 | (264,567) | |||||||
| Issuance of common stock | 290.3 | |||||||||
| Issuance of common stock (in shares) | 17,248,954 | |||||||||
| Equity compensation expense, net of forfeitures | 0.1 | |||||||||
| Unearned Compensation [Abstract] | ||||||||||
| Issuance of restricted common stock | (3.2) | |||||||||
| Forfeiture of restricted common stock | 1.0 | |||||||||
| Compensation expense recognized | 1.6 | |||||||||
| Stockholders' Equity, Other | 0.5 | |||||||||
| Net income (loss) attributable to Great Plains Energy | 49.0 | 49.0 | 46.0 | |||||||
| Loss on reissuance of treasury stock | (0.3) | |||||||||
| Dividends: | ||||||||||
| Common stock | (57.9) | (50.0) | ||||||||
| Preferred stock - at required rates | (0.8) | |||||||||
| Performance shares | 0 | |||||||||
| Treasury shares acquired | (2.9) | |||||||||
| Treasury shares acquired (in shares) | (145,701) | |||||||||
| Treasury shares reissued | 3.5 | |||||||||
| Treasury shares reissued (in shares) | 169,800 | |||||||||
| Derivative hedging activity, net of tax | 6.1 | 2.6 | 6.1 | 2.6 | ||||||
| Change in unrecognized pension expense, net of tax | 0.1 | 0.1 | ||||||||
| Net income (loss) attributable to noncontrolling interest | 0.2 | (0.2) | ||||||||
| Distribution | (0.6) | |||||||||
| Ending balance at Jun. 30, 2012 | 3,247.0 | 2,044.1 | 2,620.9 | 1,563.1 | 674.7 | 509.8 | (5.0) | (43.6) | (28.8) | 0.2 |
| Ending balance (in shares) at Jun. 30, 2012 | 153,655,260 | 1 | (240,468) | |||||||
| Beginning balance at Mar. 31, 2012 | ||||||||||
| Unearned Compensation [Abstract] | ||||||||||
| Net income (loss) attributable to Great Plains Energy | 58.1 | |||||||||
| Dividends: | ||||||||||
| Derivative hedging activity, net of tax | 3.2 | 1.4 | ||||||||
| Change in unrecognized pension expense, net of tax | 0 | |||||||||
| Net income (loss) attributable to noncontrolling interest | 0 | |||||||||
| Ending balance at Jun. 30, 2012 | 3,247.0 | 2,044.1 | 1,563.1 | |||||||
| Ending balance (in shares) at Jun. 30, 2012 | 1 | |||||||||
| Beginning balance at Dec. 31, 2012 | 3,340.0 | 2,096.7 | 2,624.7 | 1,563.1 | 758.8 | 559.4 | (5.1) | (38.4) | (25.8) | 0 |
| Beginning balance (in shares) at Dec. 31, 2012 | 153,779,806 | 1 | (250,236) | |||||||
| Issuance of common stock | 2.6 | |||||||||
| Issuance of common stock (in shares) | 114,918 | |||||||||
| Equity compensation expense, net of forfeitures | 0.2 | |||||||||
| Unearned Compensation [Abstract] | ||||||||||
| Issuance of restricted common stock | (1.7) | |||||||||
| Forfeiture of restricted common stock | 0 | |||||||||
| Compensation expense recognized | 1.0 | |||||||||
| Stockholders' Equity, Other | 0.5 | |||||||||
| Net income (loss) attributable to Great Plains Energy | 89.6 | 89.6 | 60.4 | |||||||
| Loss on reissuance of treasury stock | 0 | |||||||||
| Dividends: | ||||||||||
| Common stock | (66.8) | (46.0) | ||||||||
| Preferred stock - at required rates | (0.8) | |||||||||
| Performance shares | (0.2) | |||||||||
| Treasury shares acquired | (1.2) | |||||||||
| Treasury shares acquired (in shares) | (55,731) | |||||||||
| Treasury shares reissued | 3.7 | |||||||||
| Treasury shares reissued (in shares) | 184,721 | |||||||||
| Derivative hedging activity, net of tax | 6.1 | 2.8 | 6.1 | 2.8 | ||||||
| Change in unrecognized pension expense, net of tax | 0.2 | 0.2 | ||||||||
| Net income (loss) attributable to noncontrolling interest | 0 | 0 | ||||||||
| Distribution | 0 | |||||||||
| Ending balance at Jun. 30, 2013 | 3,373.2 | 2,113.9 | 2,627.3 | 1,563.1 | 780.6 | 573.8 | (2.6) | (32.1) | (23.0) | 0 |
| Ending balance (in shares) at Jun. 30, 2013 | 153,894,724 | 1 | (121,246) | |||||||
| Beginning balance at Mar. 31, 2013 | ||||||||||
| Unearned Compensation [Abstract] | ||||||||||
| Net income (loss) attributable to Great Plains Energy | 63.6 | |||||||||
| Dividends: | ||||||||||
| Derivative hedging activity, net of tax | 2.9 | 1.3 | ||||||||
| Change in unrecognized pension expense, net of tax | 0.2 | |||||||||
| Net income (loss) attributable to noncontrolling interest | 0 | |||||||||
| Ending balance at Jun. 30, 2013 | $ 3,373.2 | $ 2,113.9 | $ 1,563.1 | |||||||
| Ending balance (in shares) at Jun. 30, 2013 | 1 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. No definition available.
|
| X | ||||||||||
|
- Definition
Items including common stock value, paid in capital, retained earnings, common stock purchased for the treasury and excluding noncontrolling interests (minority interests) and preferred stockholder interests. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of preferred stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of cash dividends declared by an entity during the period and applicable to holders of share-based compensation, such as non-vested shares, stock options, or restricted stock units. This element includes paid and unpaid dividends declared during the period. No definition available.
|
| X | ||||||||||
|
- Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net of tax and reclassification adjustments amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net of tax and reclassifications amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. No definition available.
|
| X | ||||||||||
|
- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Value of stock related to Restricted Stock Awards forfeited during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Aggregate value of stock related to Restricted Stock Awards issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
In cases when treasury stock is reissued at a price lower than the cost to repurchase, the excess difference between the selling price and cost to repurchase is charged against retained earnings (assuming that all APIC arising from treasury stock transactions has first been exhausted). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Consolidated Statements of Common Shareholders' Equity and Noncontrolling Interest Consolidated Statements of Common Shareholders' Equity and Noncontrolling Interest (Parenthetical) (USD $)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Stock Transactions, Parenthetical Disclosures [Abstract] | ||||
| Common Stock, Dividends, Per Share, Declared | $ 0.2175 | $ 0.2125 | $ 0.435 | $ 0.425 |
| X | ||||||||||
|
- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Summary of Significant Accounting Policies
|
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
|
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Significant Accounting Policies [Text Block] | 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization Great Plains Energy, a Missouri corporation incorporated in 2001, is a public utility holding company and does not own or operate any significant assets other than the stock of its subsidiaries. Great Plains Energy's wholly owned direct subsidiaries with operations or active subsidiaries are as follows:
Each of Great Plains Energy's and KCP&L's consolidated financial statements includes the accounts of their subsidiaries. Intercompany transactions have been eliminated. Great Plains Energy's sole reportable business segment is electric utility. See Note 16 for additional information. Basic and Diluted Earnings per Common Share Calculation To determine basic EPS, preferred stock dividend requirements and net loss attributable to noncontrolling interest are deducted from net income before dividing by the average number of common shares outstanding. The effect of dilutive securities, calculated using the treasury stock method, assumes the issuance of common shares applicable to performance shares, restricted stock and Equity Units. Great Plains Energy settled the Equity Units in June 2012. The following table reconciles Great Plains Energy's basic and diluted EPS.
Anti-dilutive shares excluded from the computation of diluted EPS are detailed in the following table.
Dividends Declared In August 2013, Great Plains Energy's Board of Directors (Board) declared a quarterly dividend of $0.2175 per share on Great Plains Energy's common stock. The common dividend is payable September 20, 2013, to shareholders of record as of August 29, 2013. The Board also declared regular dividends on Great Plains Energy's preferred stock, payable December 1, 2013, to shareholders of record as of November 7, 2013. In August 2013, KCP&L’s Board of Directors declared a cash dividend payable to Great Plains Energy of $23 million payable on September 19, 2013. |
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- Details
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| X | ||||||||||
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- Definition
The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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|
Supplemental Cash Flow Information
|
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Supplemental Cash Flow Elements [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cash Flow, Supplemental Disclosures [Text Block] | 2. SUPPLEMENTAL CASH FLOW INFORMATION
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| X | ||||||||||
|
- Definition
The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
|
|
Receivables
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Receivables [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Receivables [Text Block] | 3. RECEIVABLES Great Plains Energy's and KCP&L's receivables are detailed in the following table.
Great Plains Energy's and KCP&L's other receivables at June 30, 2013, and December 31, 2012, consisted primarily of receivables from partners in jointly owned electric utility plants and wholesale sales receivables. Sale of Accounts Receivable – KCP&L and GMO KCP&L and GMO sell all of their retail electric and steam service accounts receivable to their wholly owned subsidiaries, KCP&L Receivables Company and GMO Receivables Company, respectively, which in turn sell an undivided percentage ownership interest in the accounts receivable to Victory Receivables Corporation, an independent outside investor. Each of KCP&L Receivables Company's and GMO Receivables Company's sale of the undivided percentage ownership interest in accounts receivable to Victory Receivables Corporation is accounted for as a secured borrowing with accounts receivable pledged as collateral and a corresponding short-term collateralized note payable recognized on the balance sheets. At June 30, 2013, and December 31, 2012, Great Plains Energy's accounts receivable pledged as collateral and the corresponding short-term collateralized note payable were $175.0 million and $174.0 million, respectively. At June 30, 2013, and December 31, 2012, KCP&L's accounts receivable pledged as collateral and the corresponding short-term collateralized note payable were $110.0 million. KCP&L and GMO each sell their receivables at a fixed price based upon the expected cost of funds and charge-offs. These costs comprise KCP&L's and GMO's loss on the sale of accounts receivable. KCP&L and GMO service the receivables and receive annual servicing fees of 1.5% and 1.25%, respectively, of the outstanding principal amount of the receivables sold to KCP&L Receivables Company and GMO Receivables Company. KCP&L and GMO do not recognize a servicing asset or liability because management determined the collection agent fees earned by KCP&L and GMO approximate market value. KCP&L's agreement expires in September 2014 and allows for $110 million in aggregate outstanding principal amount at any time. GMO's agreement expires in September 2014 and allows for $80 million in aggregate outstanding principal during the period of June 1 through October 31 and $65 million in aggregate outstanding principal during the period of November 1 through May 31 of each year. Information regarding KCP&L's sale of accounts receivable to KCP&L Receivables Company and GMO's sale of accounts receivable to GMO Receivables Company is reflected in the following tables.
(a) Any net gain (loss) is the result of the timing difference inherent in collecting receivables and over the life of the agreement will net to zero. |
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Includes disclosure of claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables. Also provides the disclosures pertaining to a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangements. No definition available.
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Nuclear Plant
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Jun. 30, 2013
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| Nuclear Plant [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Nuclear Plant | 4. NUCLEAR PLANT KCP&L owns 47% of Wolf Creek Generating Station (Wolf Creek), its only nuclear generating unit. Wolf Creek is located in Coffey County, Kansas, just northeast of Burlington, Kansas. Wolf Creek's operating license expires in 2045. Wolf Creek is regulated by the Nuclear Regulatory Commission (NRC) with respect to licensing, operations and safety-related requirements. Spent Nuclear Fuel and High-Level Radioactive Waste Under the Nuclear Waste Policy Act of 1982, the Department of Energy (DOE) is responsible for the permanent disposal of spent nuclear fuel. KCP&L pays the DOE a quarterly fee of one-tenth of a cent for each kWh of net nuclear generation delivered and sold for the future disposal of spent nuclear fuel. These disposal costs are charged to fuel expense. In 2010, the DOE filed a motion with the NRC to withdraw its then pending application to the NRC to construct a national repository for the disposal of spent nuclear fuel and high-level radioactive waste at Yucca Mountain, Nevada. An NRC board denied the DOE's motion to withdraw its application, and the DOE appealed that decision to the full NRC. In 2011, the NRC issued an evenly split decision on the appeal and ordered the licensing board to close out its work on the DOE's application due to a lack of funding. These agency actions prompted multiple states and a municipality to file a lawsuit in a federal court of appeals asking the court to compel the NRC to resume its review and to issue a decision on the license application. The court has not yet issued a final decision in the case. Wolf Creek has an on-site storage facility designed to hold all spent fuel generated at the plant through 2025, and believes it will be able to expand on-site storage as needed past 2025. Management cannot predict when, or if, an alternative disposal site will be available to receive Wolf Creek's spent nuclear fuel and will continue to monitor this activity. Low-Level Radioactive Waste Wolf Creek disposes of most of its low-level radioactive waste (Class A waste) at an existing third-party repository in Utah. Management expects that the site located in Utah will remain available to Wolf Creek for disposal of its Class A waste. Wolf Creek has contracted with a waste processor that will process, take title and dispose in another state most of the remainder of Wolf Creek's low-level radioactive waste (Classes B and C waste, which is higher in radioactivity but much lower in volume). Should on-site waste storage be needed in the future, Wolf Creek has current storage capacity on site for about four years' generation of Classes B and C waste and believes it will be able to expand that storage capacity as needed if it becomes necessary to do so. Nuclear Decommissioning Trust Fund The following table summarizes the change in Great Plains Energy's and KCP&L's nuclear decommissioning trust fund.
The nuclear decommissioning trust is reported at fair value on the balance sheets and is invested in assets as detailed in the following table.
The weighted-average maturity of debt securities held by the trust at June 30, 2013, was approximately 7 years. The costs of securities sold are determined on the basis of specific identification. The following table summarizes the realized gains and losses from the sale of securities in the nuclear decommissioning trust fund.
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This element can be used to encapsulate the entire disclosure for plant used in connection with the generation of nuclear energy. No definition available.
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| Compensation and Retirement Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pension Plans and Other Employee Benefits | 5. PENSION PLANS AND OTHER EMPLOYEE BENEFITS Great Plains Energy maintains defined benefit pension plans for substantially all active and inactive employees, including officers, of KCP&L, GMO and Wolf Creek Nuclear Operating Corporation (WCNOC) and incurs significant costs in providing the plans. Pension benefits under these plans reflect the employees' compensation, years of service and age at retirement. In addition to providing pension benefits, Great Plains Energy provides certain post-retirement health care and life insurance benefits for substantially all retired employees of KCP&L, GMO and WCNOC. KCP&L and GMO record pension and post-retirement expense in accordance with rate orders from the Public Service Commission of the State of Missouri (MPSC) and The State Corporation Commission of the State of Kansas (KCC) that allow the difference between pension and post-retirement costs under Generally Accepted Accounting Principles (GAAP) and costs for ratemaking to be recognized as a regulatory asset or liability. This difference between financial and regulatory accounting methods is due to timing and will be eliminated over the life of the plans. The following tables provide Great Plains Energy's components of net periodic benefit costs prior to the effects of capitalization and sharing with joint owners of power plants.
Year to date June 30, 2013, the Company contributed $32.4 million to the pension plans and expects to contribute an additional $25.0 million in 2013 to satisfy the minimum Employee Retirement Income Security Act of 1974, as amended (ERISA) funding requirements and the MPSC and KCC rate orders, the majority of which is expected to be paid by KCP&L. Also in 2013, the Company expects to make contributions of $18.7 million to the post-retirement benefit plans, the majority of which is expected to be paid by KCP&L. |
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The entire disclosure for pension and other postretirement benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Equity Compensation
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity Compensation | 6. EQUITY COMPENSATION Great Plains Energy's Long-Term Incentive Plan is an equity compensation plan approved by Great Plains Energy's shareholders. The Long-Term Incentive Plan permits the grant of restricted stock, restricted stock units, bonus shares, stock options, stock appreciation rights, limited stock appreciation rights, director shares, director deferred share units and performance shares to directors, officers and other employees of Great Plains Energy and KCP&L. Forfeiture rates are based on historical forfeitures and future expectations and are reevaluated annually. The following table summarizes Great Plains Energy's and KCP&L's equity compensation expense and the associated income tax benefit.
Performance Shares Performance share activity year to date June 30, 2013, is summarized in the following table. Performance adjustment represents the number of shares of common stock related to performance shares ultimately issued that can vary from the number of performance shares initially granted depending on Great Plains Energy's performance over a stated period of time.
* weighted-average At June 30, 2013, the remaining weighted-average contractual term was 1.8 years. There were no shares granted for the three months ended June 30, 2013. The weighted-average grant-date fair value of shares granted was $24.16 year to date June 30, 2013. The weighted-average grant-date fair value of shares granted was $20.99 and $19.01 for the three months ended and year to date June 30, 2012, respectively. At June 30, 2013, there was $5.0 million of total unrecognized compensation expense, net of forfeiture rates, related to performance shares granted under the Long-Term Incentive Plan, which will be recognized over the remaining weighted-average contractual term. The total fair value of performance shares earned and paid year to date June 30, 2013, was $2.4 million. There were no performance shares earned and paid year to date June 30, 2012. The fair value of performance share awards is estimated using the market value of the Company's stock at the valuation date and a Monte Carlo simulation technique that incorporates assumptions for inputs of expected volatilities, dividend yield and risk-free rates. Expected volatility is based on daily stock price change during a historical period commensurate with the remaining term of the performance period of the grant. The risk-free rate is based upon the rate at the time of the evaluation for zero-coupon government bonds with a maturity consistent with the remaining performance period of the grant. The dividend yield is based on the most recent dividends paid and the actual closing stock price on the valuation date. For shares granted in 2013, inputs for expected volatility, dividend yield and risk-free rates were 19%, 3.88% and 0.35%, respectively. Restricted Stock Restricted stock activity year to date June 30, 2013, is summarized in the following table.
* weighted-average At June 30, 2013, the remaining weighted-average contractual term was 1.6 years. There were no shares granted for the three months ended June 30, 2013. The weighted-average grant-date fair value of shares granted was $22.45 year to date June 30, 2013. The weighted-average grant-date fair value of shares granted was $19.89 and $19.69 for the three months ended and year to date June 30, 2012, respectively. At June 30, 2013, there was $3.2 million of total unrecognized compensation expense, net of forfeiture rates, related to nonvested restricted stock granted under the Long-Term Incentive Plan, which will be recognized over the remaining weighted-average contractual term. The total fair value of shares vested was insignificant and $0.6 million for the three months ended and year to date June 30, 2013, respectively. The total fair value of shares vested was $1.3 million and $3.2 million for the three months ended and year to date June 30, 2012, respectively. |
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The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Short-term Borrowings and Short-term Bank Lines of Credit
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| Short-term Borrowings and Short-term Bank Lines of Credit [Abstract] | |
| Short-term Borrowings and Short-term Bank Lines of Credit [Text Block] | 7. SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT Great Plains Energy's $200 Million Revolving Credit Facility Great Plains Energy's $200 million revolving credit facility with a group of banks expires in December 2016. The facility's terms permit transfers of unused commitments between this facility and the KCP&L and GMO facilities discussed below, with the total amount of the facility not exceeding $400 million at any one time. A default by Great Plains Energy or any of its significant subsidiaries on other indebtedness totaling more than $50.0 million is a default under the facility. Under the terms of this facility, Great Plains Energy is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the facility, not greater than 0.65 to 1.00 at all times. At June 30, 2013, Great Plains Energy was in compliance with this covenant. At June 30, 2013, Great Plains Energy had $6.0 million of outstanding cash borrowings at a weighted-average interest rate of 2.00% and had issued letters of credit totaling $1.8 million under the credit facility. At December 31, 2012, Great Plains Energy had $12.0 million of outstanding cash borrowings at a weighted-average interest rate of 2.00% and had issued letters of credit totaling $1.8 million under the credit facility. KCP&L's $600 Million Revolving Credit Facility and Commercial Paper KCP&L's $600 million revolving credit facility with a group of banks provides support for its issuance of commercial paper and other general corporate purposes and expires in December 2016. Great Plains Energy and KCP&L may transfer up to $200 million of unused commitments between Great Plains Energy's and KCP&L's facilities. A default by KCP&L on other indebtedness totaling more than $50.0 million is a default under the facility. Under the terms of this facility, KCP&L is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the facility, not greater than 0.65 to 1.00 at all times. At June 30, 2013, KCP&L was in compliance with this covenant. At June 30, 2013, KCP&L had $200.0 million of commercial paper outstanding at a weighted-average interest rate of 0.35%, had issued letters of credit totaling $5.3 million and had no outstanding cash borrowings under the credit facility. At December 31, 2012, KCP&L had $361.0 million of commercial paper outstanding at a weighted-average interest rate of 0.48%, had issued letters of credit totaling $13.9 million and had no outstanding cash borrowings under the credit facility. GMO's $450 Million Revolving Credit Facility and Commercial Paper GMO's $450 million revolving credit facility with a group of banks provides support for its issuance of commercial paper and other general corporate purposes and expires in December 2016. Great Plains Energy and GMO may transfer up to $200 million of unused commitments between Great Plains Energy's and GMO's facilities. A default by GMO, Great Plains Energy or any of their significant subsidiaries on other indebtedness totaling more than $50.0 million is a default under the facility. Great Plains Energy currently guarantees this GMO credit facility. Under the terms of this facility, GMO is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the facility, not greater than 0.65 to 1.00 at all times. At June 30, 2013, GMO was in compliance with this covenant. At June 30, 2013, GMO had $185.0 million of commercial paper outstanding at a weighted-average interest rate of 0.80%, had issued letters of credit totaling $15.1 million and had no outstanding cash borrowings under the credit facility. At December 31, 2012, GMO had $169.1 million of commercial paper outstanding at a weighted-average interest rate of 0.94%, had issued letters of credit totaling $15.1 million and had no outstanding cash borrowings under the credit facility. |
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| Long-Term Debt | 8. LONG-TERM DEBT Great Plains Energy's and KCP&L's long-term debt is detailed in the following table.
Fair Value of Long-Term Debt The fair value of long-term debt is categorized as a Level 2 liability within the fair value hierarchy as it is based on market prices, with the incremental borrowing rate for similar debt used to determine fair value if market prices are not available. At June 30, 2013, the book value and fair value of Great Plains Energy's long-term debt, including current maturities, were $3.4 billion and $3.7 billion, respectively. At December 31, 2012, the book value and fair value of Great Plains Energy's long-term debt, including current maturities, were $3.0 billion and $3.5 billion, respectively. At June 30, 2013, the book value and fair value of KCP&L's long-term debt, including current maturities, were $2.3 billion and $2.5 billion, respectively. At December 31, 2012, the book value and fair value of KCP&L's long-term debt, including current maturities, were $1.9 billion and $2.2 billion, respectively. KCP&L Senior Notes In March 2013, KCP&L issued, at a discount, $300.0 million of 3.15% unsecured Senior Notes, maturing in 2023. EIRR Bond Remarketing In April 2013, KCP&L remarketed the following series of Environmental Improvement Revenue Refunding (EIRR) bonds:
In connection with the remarketing of the bonds, the municipal bond insurance policies issued by Syncora Guarantee Inc. relating to the Series 1992 EIRR bonds and the Series 1993 EIRR bonds and by Financial Guaranty Insurance Company (FGIC) relating to the Series 2007 EIRR bond were cancelled. In connection with the cancellation of the policy relating to the Series 2007 EIRR bonds, KCP&L’s Mortgage Bond Series 2007 EIRR Insurer due 2035 was retired. This mortgage bond, in the amount of $146.5 million, was issued and delivered to FGIC in 2009 to collateralize FGIC’s claim on KCP&L under the related insurance agreement. In July 2013, KCP&L remarketed its unsecured Series 2008 EIRR bonds maturing in 2038 totaling $23.4 million at a fixed rate of 2.875% through July 1, 2018. |
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Commitments and Contingencies
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| Commitments and Contingencies Disclosure [Abstract] | |
| Commitments and Contingencies | 9. COMMITMENTS AND CONTINGENCIES Environmental Matters Great Plains Energy and KCP&L are subject to extensive federal, state and local environmental laws, regulations and permit requirements relating to air and water quality, waste management and disposal, natural resources and health and safety. In addition to imposing continuing compliance obligations and remediation costs, these laws, regulations and permits authorize the imposition of substantial penalties for noncompliance, including fines, injunctive relief and other sanctions. The cost of complying with current and future environmental requirements is expected to be material to Great Plains Energy and KCP&L. Failure to comply with environmental requirements or to timely recover environmental costs through rates could have a material effect on Great Plains Energy's and KCP&L's results of operations, financial position and cash flows. Great Plains Energy's and KCP&L's current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction (AFUDC) and property taxes) to comply with current final environmental regulations where the timing is certain is approximately $700 million. The actual cost of compliance with any existing, proposed or future laws and regulations may be significantly different from the cost estimate provided. The current estimate of approximately $700 million of capital expenditures reflects costs to install environmental equipment at KCP&L's La Cygne Nos. 1 and 2 by June 2015 to comply with the Best Available Retrofit Technology (BART) rule and environmental upgrades at other coal-fired generating units through 2016 to comply with the Mercury and Air Toxics Standards (MATS) rule. In September 2011, KCP&L commenced construction of the La Cygne projects and at June 30, 2013, had incurred approximately $311 million of cash capital expenditures, which is included in the approximate $700 million estimate above. Great Plains Energy and KCP&L estimate that other capital projects at coal-fired generating units for compliance with the Clean Air Act and Clean Water Act based on proposed or final environmental regulations where the timing is uncertain could be approximately $600 million to $800 million for Great Plains Energy, which includes approximately $350 million to $450 million for KCP&L. However, these other projects are less certain and the timeframe cannot be estimated and therefore are not included in the approximately $700 million estimated cost of compliance discussed above. The Companies expect to seek recovery of the costs associated with environmental requirements through rate increases; however, there can be no assurance that such rate increases would be granted. The Companies may be subject to materially adverse rate treatment in response to competitive, economic, political, legislative or regulatory factors and/or public perception of the Companies' environmental reputation. The following discussion groups environmental and certain associated matters into the broad categories of air and climate change, water, solid waste and remediation. Clean Air Act and Climate Change Overview The Clean Air Act and associated regulations enacted by the Environmental Protection Agency (EPA) form a comprehensive program to preserve and enhance air quality. States are required to establish regulations and programs to address all requirements of the Clean Air Act and have the flexibility to enact more stringent requirements. All of Great Plains Energy's and KCP&L's generating facilities, and certain of their other facilities, are subject to the Clean Air Act. Clean Air Interstate Rule (CAIR) and Cross-State Air Pollution Rule (CSAPR) The CAIR requires reductions in SO2 and NOx emissions in 28 states, including Missouri, accomplished through statewide caps. Great Plains Energy's and KCP&L's fossil fuel-fired plants located in Missouri are subject to CAIR, while their fossil fuel-fired plants in Kansas are not. In July 2008, the U.S. Court of Appeals for the D.C. Circuit (D.C. Circuit Court) vacated CAIR in its entirety and remanded the matter to the EPA to promulgate a new rule consistent with its opinion. In December 2008, the court issued an order reinstating CAIR pending EPA's development of a replacement regulation on remand. In July 2011, the EPA finalized the CSAPR to replace the currently-effective CAIR. The CSAPR required states within its scope to reduce power plant SO2 and NOx emissions that contribute to ozone and fine particle nonattainment in other states. Compliance with the CSAPR was scheduled to begin in 2012. Multiple states, utilities and other parties, including KCP&L, filed requests for reconsideration and stays with the EPA and/or the D.C. Circuit Court. In August 2012, the D.C. Circuit Court issued its opinion in which it vacated the CSAPR and remanded the rule to the EPA to revise in accordance with its opinion. The D.C. Circuit Court directed the EPA to continue to administer the CAIR until a valid replacement is promulgated. Best Available Retrofit Technology Rule The EPA BART rule directs state air quality agencies to identify whether visibility-reducing emissions from sources subject to BART are below limits set by the state or whether retrofit measures are needed to reduce emissions. BART applies to specific eligible facilities including KCP&L's La Cygne Nos. 1 and 2 in Kansas; KCP&L's Iatan No. 1, in which GMO has an 18% interest, and KCP&L's Montrose No. 3 in Missouri; GMO's Sibley Unit No. 3 and Lake Road Unit No. 6 in Missouri; and Westar Energy, Inc.'s (Westar) Jeffrey Unit Nos. 1 and 2 in Kansas, in which GMO has an 8% interest. Both Missouri and Kansas have approved BART plans. KCP&L has a consent agreement with the Kansas Department of Health and Environment (KDHE) incorporating limits for stack particulate matter emissions, as well as limits for NOx and SO2 emissions, at its La Cygne Station that will be below the presumptive limits under BART. KCP&L further agreed to use its best efforts to install emission control technologies to reduce those emissions from the La Cygne Station prior to the required compliance date under BART, but in no event later than June 1, 2015. In August 2011, KCC issued its order on KCP&L's predetermination request that would apply to the recovery of costs for its 50% share of the environmental equipment required to comply with BART at the La Cygne Station. In the order, KCC stated that KCP&L's decision to retrofit La Cygne was reasonable, reliable, efficient and prudent and the $1.23 billion cost estimate is reasonable. If the cost for the project is at or below the $1.23 billion estimate, absent a showing of fraud or other intentional imprudence, KCC stated that it will not re-evaluate the prudency of the cost of the project. If the cost of the project exceeds the $1.23 billion estimate and KCP&L seeks to recover amounts exceeding the estimate, KCP&L will bear the burden of proving that any additional costs were prudently incurred. KCP&L's 50% share of the estimated cost is $615 million. KCP&L began the project in September 2011. Mercury and Air Toxics Standards Rule In December 2011, the EPA finalized the MATS rule that will reduce emissions of toxic air pollutants, also known as hazardous air pollutants, from new and existing coal- and oil-fired electric utility generating units with a capacity of greater than 25 MWs. The rule establishes numerical emission limits for mercury, particulate matter (a surrogate for non-mercury metals) and hydrochloric acid (a surrogate for acid gases). The rule establishes work practices, instead of numerical emission limits, for organic air toxics, including dioxin/furan. Compliance with the rule would need to be achieved by installing additional emission control equipment, changes in plant operation, purchasing additional power in the wholesale market or a combination of these and other alternatives. The rule allows three to four years for compliance. Industrial Boiler Rule In December 2012, the EPA issued a final rule that would reduce emissions of hazardous air pollutants from new and existing industrial boilers. The final rule establishes numeric emission limits for mercury, particulate matter (as a surrogate for non-mercury metals), hydrogen chloride (as a surrogate for acid gases) and carbon monoxide (as a surrogate for non-dioxin organic hazardous air pollutants). The final rule establishes emission limits for KCP&L's and GMO's existing units that produce steam other than for the generation of electricity. The final rule does not apply to KCP&L's and GMO's electricity generating boilers, but would apply to most of GMO's Lake Road boilers, which also serve steam customers, and to auxiliary boilers at other generating facilities. The rule allows three to four years for compliance. New Source Review The Clean Air Act's New Source Review program requires companies to obtain permits and, if necessary, install control equipment to reduce emissions when making a major modification or a change in operation if either is expected to cause a significant net increase in regulated emissions. In 2010, Westar settled a lawsuit filed by the Department of Justice on behalf of the EPA and agreed to install a selective catalytic reduction (SCR) system at one of the three Jeffrey Energy Center units by the end of 2014. The Jeffrey Energy Center is 92% owned by Westar and operated exclusively by Westar. GMO has an 8% interest in the Jeffrey Energy Center and is generally responsible for its 8% share of the facility's operating costs and capital expenditures. Westar has estimated the cost of this SCR at approximately $240 million. Depending on the NOx emission reductions attained by that SCR and attainable through the installation of other controls at the other two units, the settlement agreement may require the installation of a second SCR system on one of the other two units. Westar has informed the EPA that they believe that the terms of the settlement can be met through the installation of less expensive NOx reduction equipment rather than a second SCR system and they plan to complete this project in 2014. GMO expects to seek recovery of its share of these costs through rate increases; however, there can be no assurance that such rate increases would be granted. SO2 NAAQS In June 2010, the EPA strengthened the primary NAAQS for SO2 by establishing a new 1-hour standard at a level of 0.075 ppm and revoking the two existing primary standards of 0.140 ppm evaluated over 24 hours and 0.030 ppm evaluated over an entire year. In July 2013, the EPA designated a part of Jackson County, Missouri, which is in the Companies' service territory, as a nonattainment area for the new 1-hour SO2 standard. The Missouri Department of Natural Resources (MDNR) will now develop and submit their plan to the EPA to return the area to attainment of the standard, which may include stricter controls on certain industrial facilities. Particulate Matter (PM) NAAQS In December 2012, the EPA strengthened the annual primary NAAQS for fine particulate matter (PM2.5). With the final rule, the EPA provided recent ambient air monitoring data for the Kansas City area indicating it would be in attainment of the revised fine particle standard. States will now make recommendations to designate areas as meeting the standards or not meeting them with the EPA making the final designation. Climate Change The Companies are subject to existing greenhouse gas reporting regulations and certain greenhouse gas permitting requirements. Management believes it is possible that additional federal or relevant state or local laws or regulations could be enacted to address global climate change. At the international level, while the United States is not a current party to the international Kyoto Protocol, it has agreed to undertake certain voluntary actions under the non-binding Copenhagen Accord and pursuant to subsequent international discussions relating to climate change, including the establishment of a goal to reduce greenhouse gas emissions. International agreements legally binding on the United States may be reached in the future. Such new laws or regulations could mandate new or increased requirements to control or reduce the emission of greenhouse gases, such as CO2, which are created in the combustion of fossil fuels. The Companies' current generation capacity is primarily coal-fired and is estimated to produce about one ton of CO2 per MWh, or approximately 25 million tons and 19 million tons per year for Great Plains Energy and KCP&L, respectively. Legislation concerning the reduction of emissions of greenhouse gases, including CO2, is being considered at the federal and state levels. The timing and effects of any such legislation cannot be determined at this time. In the absence of new Congressional mandates, the EPA is proceeding with the regulation of greenhouse gases under the existing Clean Air Act. In March 2012, the EPA proposed new source performance standards for emissions of CO2 for new affected fossil-fuel-fired electric utility generating units. This action pursuant to the Clean Air Act would, for the first time, set national limits on the amount of CO2 that power plants built in the future can emit. The proposal would not apply to Great Plains Energy's and KCP&L's existing units including modifications to those units. In June 2013, United States President Barack Obama announced a climate action plan and issued a presidential memorandum to address one element of the plan which is to reduce power plant carbon pollution. The memorandum directs the EPA to: (1) issue a new proposal addressing new units no later than September 20, 2013, and finalize the rule in a timely fashion; (2) issue proposed carbon pollution standards, regulations or guidelines, as appropriate, for modified, reconstructed and existing power plants by no later than June 1, 2014; (3) issue final standards, regulations or guidelines, as appropriate, for modified, reconstructed and existing power plants by no later than June 1, 2015; (4) include in the guidelines addressing existing power plants a requirement that states submit to the EPA the implementation plans by no later than June 30, 2016; and (5) engage with states, leaders in the power sector and other stakeholders on issues related to the rules. Greenhouse gas legislation or regulation has the potential of having significant financial and operational impacts on Great Plains Energy and KCP&L, including the potential costs and impacts of achieving compliance with limits that may be established. However, the ultimate financial and operational consequences to Great Plains Energy and KCP&L cannot be determined until such legislation is passed and/or regulations are issued. Management will continue to monitor the progress of relevant legislation and regulations. Laws have been passed in Missouri and Kansas, the states in which the Companies' retail electric businesses are operated, setting renewable energy standards, and management believes that national clean or renewable energy standards are also possible. While management believes additional requirements addressing these matters will possibly be enacted, the timing, provisions and impact of such requirements, including the cost to obtain and install new equipment to achieve compliance, cannot be reasonably estimated at this time. A Kansas law enacted in May 2009 required Kansas public electric utilities, including KCP&L, to have renewable energy generation capacity equal to at least 10% of their three-year average Kansas peak retail demand by 2011 increasing to 15% by 2016 and 20% by 2020. A Missouri law enacted in November 2008 required at least 2% of the electricity provided by Missouri investor-owned utilities (including KCP&L and GMO) to their Missouri retail customers to come from renewable resources, including wind, solar, biomass and hydropower, by 2011, increasing to 5% in 2014, 10% in 2018, and 15% in 2021, with a small portion (estimated to be about 2 MW for each of KCP&L and GMO) required to come from solar resources. KCP&L and GMO project that they will be compliant with the Missouri renewable requirements, exclusive of the solar requirement, through 2023 for KCP&L and 2018 for GMO. KCP&L and GMO project that the acquisition of solar renewable energy credits will be sufficient for compliance with the Missouri solar requirements for the foreseeable future. KCP&L also projects that it will be compliant with the Kansas renewable requirements through 2015. Clean Water Act The Clean Water Act and associated regulations enacted by the EPA form a comprehensive program to restore and preserve water quality. Like the Clean Air Act, states are required to establish regulations and programs to address all requirements of the Clean Water Act, and have the flexibility to enact more stringent requirements. All of Great Plains Energy's and KCP&L's generating facilities, and certain of their other facilities, are subject to the Clean Water Act. In March 2011, the EPA proposed regulations pursuant to Section 316(b) of the Clean Water Act regarding cooling water intake structures pursuant to a court approved settlement. KCP&L generation facilities with cooling water intake structures would be subject to a limit on how many fish can be killed by being pinned against intake screens (impingement) and would be required to conduct studies to determine whether and what site-specific controls, if any, would be required to reduce the number of aquatic organisms drawn into cooling water systems (entrainment). The EPA agreed to finalize the rule by November 2013. Although the impact on Great Plains Energy's and KCP&L's operations will not be known until after the rule is finalized, it could have a significant effect on Great Plains Energy's and KCP&L's results of operations, financial position and cash flows. KCP&L holds a permit from the MDNR covering water discharge from its Hawthorn Station. The permit authorizes KCP&L to, among other things, withdraw water from the Missouri River for cooling purposes and return the heated water to the Missouri River. KCP&L has applied for a renewal of this permit and the EPA has submitted an interim objection letter regarding the allowable amount of heat that can be contained in the returned water. Until this matter is resolved, KCP&L continues to operate under its current permit. KCP&L cannot predict the outcome of this matter; however, while less significant outcomes are possible, this matter may require KCP&L to reduce its generation at Hawthorn Station, install cooling towers or both, any of which could have a significant impact on KCP&L's results of operations, financial position and cash flows. The outcome could also affect the terms of water permit renewals at KCP&L's Iatan Station and at GMO's Sibley and Lake Road Stations. In April 2013, the EPA proposed to revise the technology-based effluent limitations guidelines and standards regulation to make the existing controls on discharges from steam electric power plants more stringent. The proposal sets the first federal limits on the levels of toxic metals in wastewater that can be discharged from power plants. The new requirements for existing power plants would be phased in between 2017 and 2022. The EPA is under a consent decree to take final action on the proposed rule by May 2014. The proposal includes a variety of options to reduce pollutants that are discharged into waterways by coal ash, air pollution control waste and other waste from steam electric power plants. Depending on the option, the proposed rule would establish new or additional requirements for wastewaters associated with the following processes and byproducts at certain KCP&L and GMO stations: flue gas desulfurization, fly ash, bottom ash, flue gas mercury control, combustion residual leachate from landfills and surface impoundments, and non-chemical metal cleaning wastes. The EPA also announced its intention to align this proposal with a related rule for coal combustion residuals (CCRs) proposed in May 2010 under the Resource Conservation and Recovery Act (RCRA). The EPA is considering establishing best management practices requirements that would apply to surface impoundments containing CCRs. The cost of complying with the proposed rules has the potential of having a significant financial and operational impact on Great Plains Energy and KCP&L. However, the financial and operational consequences to Great Plains Energy and KCP&L cannot be determined until the final regulation is enacted. Solid Waste Solid and hazardous waste generation, storage, transportation, treatment and disposal is regulated at the federal and state levels under various laws and regulations. In May 2010, the EPA proposed to regulate CCRs under the RCRA to address the risks from the disposal of CCRs generated from the combustion of coal at electric generating facilities. The EPA is considering two options in this proposal. Under the first option, the EPA would regulate CCRs as special wastes under subtitle C of RCRA (hazardous), when they are destined for disposal in landfills or surface impoundments. Under the second option, the EPA would regulate disposal of CCRs under subtitle D of RCRA (non-hazardous). The Companies use coal in generating electricity and dispose of the CCRs in both on-site facilities and facilities owned by third parties. The cost of complying with the proposed CCR rule has the potential of having a significant financial and operational impact on Great Plains Energy and KCP&L. However, the financial and operational consequences to Great Plains Energy and KCP&L cannot be determined until an option is selected by the EPA and the final regulation is enacted. Remediation Certain federal and state laws, including the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), hold current and previous owners or operators of contaminated facilities and persons who arranged for the disposal or treatment of hazardous substances liable for the cost of investigation and cleanup. CERCLA and other laws also authorize the EPA and other agencies to issue orders compelling potentially responsible parties to clean up sites that are determined to present an actual or potential threat to human health or the environment. GMO is named as a potentially responsible party at two disposal sites for polychlorinated biphenyl (PCB) contamination, and retains some environmental liability for several operations and investments it no longer owns. In addition, GMO also owns, or has acquired liabilities from companies that once owned or operated, former manufactured gas plant (MGP) sites, which are subject to the supervision of the EPA and various state environmental agencies. At June 30, 2013, and December 31, 2012, KCP&L had $0.3 million accrued for environmental remediation expenses, which covers ground water monitoring at a former MGP site. The amount accrued was established on an undiscounted basis and KCP&L does not currently have an estimated time frame over which the accrued amount may be paid. In addition to the $0.3 million accrual above, at June 30, 2013, and December 31, 2012, Great Plains Energy had $2.0 million accrued for the future investigation and remediation of certain additional GMO identified MGP sites and retained liabilities. This estimate was based upon review of the potential costs associated with conducting investigative and remedial actions at identified sites, as well as the likelihood of whether such actions will be necessary. This estimate could change materially after further investigation, and could also be affected by the actions of environmental agencies and the financial viability of other potentially responsible parties; however, given the uncertainty of these items the possible loss or range of loss in excess of the amount accrued is not estimable. GMO has pursued recovery of remediation costs from insurance carriers and other potentially responsible parties. As a result of a settlement with an insurance carrier, approximately $2.6 million in insurance proceeds less an annual deductible is available to GMO to recover qualified MGP remediation expenses. GMO would seek recovery of additional remediation costs and expenses through rate increases; however, there can be no assurance that such rate increases would be granted. |
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| Legal Proceedings [Text Block] | 10. LEGAL PROCEEDINGS GMO Western Energy Crisis In response to complaints of manipulation of the California energy market, The Federal Energy Regulatory Commission (FERC) issued an order in July 2001 requiring net sellers of power in the California markets from October 2, 2000, through June 20, 2001, at prices above a FERC-determined competitive market clearing price, to make refunds to net purchasers of power in the California market during that time period. Because MPS Merchant was a net purchaser of power during the refund period, it has received approximately $8 million in refunds through settlements with certain sellers of power. MPS Merchant estimates that it is entitled to approximately $12 million in additional refunds under the standards FERC has used in this case. FERC has stated that interest will be applied to the refunds but the amount of interest has not yet been determined. In December 2001, various parties appealed the July 2001 FERC order to the United States Court of Appeals for the Ninth Circuit (Ninth Circuit) seeking review of a number of issues, including expansion of the refund period to include periods prior to October 2, 2000 (the Summer Period). MPS Merchant was a net seller of power during the Summer Period. On August 2, 2006, the Ninth Circuit issued an order finding, among other things, that FERC did not provide a sufficient justification for refusing to exercise its remedial authority under the Federal Power Act to determine whether market participants violated FERC-approved tariffs during the Summer Period. The court remanded the matter to FERC for further consideration. If FERC determines that MPS Merchant violated then-existing tariffs or laws during the Summer Period and that such violations affected market clearing prices in California, MPS Merchant could be found to owe refunds. Due to the uncertainties remaining in this case, the potential refund or range of potential refunds owed by MPS Merchant are not reasonably estimable. |
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| Related Party Transactions and Relationships | 11. RELATED PARTY TRANSACTIONS AND RELATIONSHIPS KCP&L employees manage GMO's business and operate its facilities at cost. These costs totaled $24.4 million and $49.6 million, respectively, for the three months ended and year to date June 30, 2013. These costs totaled $26.7 million and $52.9 million, respectively, for the same periods in 2012. Additionally, KCP&L and GMO engage in wholesale electricity transactions with each other. KCP&L's net wholesale sales to GMO were $4.6 million and $10.0 million for the three months ended and year to date June 30, 2013, respectively. KCP&L's net wholesale sales to GMO were $7.4 million and $12.8 million, respectively, for the same periods in 2012. KCP&L and GMO are also authorized to participate in the Great Plains Energy money pool, an internal financing arrangement in which funds may be lent on a short-term basis to KCP&L and GMO from Great Plains Energy and between KCP&L and GMO. At June 30, 2013, KCP&L had a money pool receivable from GMO of $36.3 million. At December 31, 2012, KCP&L had a money pool payable to Great Plains Energy of $3.8 million. The following table summarizes KCP&L's related party net receivables.
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| Derivative Instruments and Hedging Activities Disclosure [Text Block] | 12. DERIVATIVE INSTRUMENTS Great Plains Energy and KCP&L are exposed to a variety of market risks including interest rates and commodity prices. Management has established risk management policies and strategies to reduce the potentially adverse effects that the volatility of the markets may have on Great Plains Energy's and KCP&L's operating results. Great Plains Energy's and KCP&L's interest rate risk management activities have included using derivative instruments to hedge against future interest rate fluctuations on anticipated debt issuances. Commodity risk management activities, including the use of certain derivative instruments, are subject to the management, direction and control of an internal commodity risk committee. Management maintains commodity price risk management strategies that use derivative instruments to reduce the effects of fluctuations in fuel and purchased power expense caused by commodity price volatility. Counterparties to commodity derivatives expose Great Plains Energy and KCP&L to credit loss in the event of nonperformance. This credit loss is limited to the cost of replacing these contracts at current market rates. Derivative instruments, excluding those instruments that qualify for the normal purchases and normal sales (NPNS) election, which are accounted for by accrual accounting, are recorded on the balance sheet at fair value as an asset or liability. Changes in the fair value of derivative instruments are recognized currently in net income unless specific hedge accounting criteria are met, except hedges for GMO's utility operations that are recorded to a regulatory asset or liability consistent with MPSC regulatory orders, as discussed below. Great Plains Energy and KCP&L have posted collateral, in the ordinary course of business, for the aggregate fair value of all derivative instruments with credit risk-related contingent features that are in a liability position. At June 30, 2013, Great Plains Energy and KCP&L have posted collateral in excess of the aggregate fair value of their derivative instruments; therefore, if the credit risk-related contingent features underlying these agreements were triggered, Great Plains Energy and KCP&L would not be required to post additional collateral to their counterparties. For derivative contracts with counterparties under master netting agreements, Great Plains Energy and KCP&L can net all receivables and payables with each respective counterparty. Commodity Risk Management KCP&L's risk management policy is to use derivative instruments, as needed, in order to mitigate its exposure to market price fluctuations on a portion of its projected natural gas purchases to meet generation requirements for retail and firm wholesale sales. KCP&L designates these natural gas hedges as cash flow hedges. The fair values of these instruments are recorded as derivative assets or liabilities with an offsetting entry to OCI for the effective portion of the hedge. To the extent the hedges are not effective, any ineffective portion of the change in fair market value would be recorded currently in fuel expense. At June 30, 2013, KCP&L had no hedges for its projected natural gas usage for retail load and firm MWh sales. KCP&L did not record any ineffectiveness on natural gas hedges for the three months ended and year to date June 30, 2013 and 2012. Additionally, KCP&L's risk management policy uses derivative instruments to mitigate exposure to market price fluctuations for wholesale power prices. KCP&L has designated these financial contracts as economic hedges (non-hedging derivatives). The fair values of these instruments are recorded as derivative assets or liabilities with an offsetting entry to the consolidated statements of income. GMO's risk management policy is to use derivative instruments to mitigate exposure to natural gas price volatility in the market. At June 30, 2013, GMO had financial contracts in place to hedge approximately 38%, 23% and 3% of its expected on-peak natural gas generation and natural gas equivalent purchased power price exposure for the remainder of 2013, 2014 and 2015, respectively. The fair value of the portfolio will settle against actual purchases of natural gas and purchased power. GMO has designated its natural gas hedges as economic hedges (non-hedging derivatives). In connection with GMO's 2005 Missouri electric rate case, it was agreed that the settlement costs of these contracts would be recognized in fuel expense. The settlement cost is included in GMO's Fuel Adjustment Clause (FAC). A regulatory asset has been recorded to reflect the change in the timing of recognition authorized by the MPSC. Recovery of actual costs incurred will not impact earnings, but will impact cash flows due to the timing of the recovery mechanism. MPS Merchant, which has certain long-term natural gas contracts remaining from its former non-regulated trading operations, manages the daily delivery of its remaining contractual commitments with economic hedges (non-hedging derivatives) to reduce its exposure to changes in market prices. Within the trading portfolio, MPS Merchant takes certain positions to hedge physical sale or purchase contracts. MPS Merchant records the fair value of physical trading energy contracts as derivative assets or liabilities with an offsetting entry to the consolidated statements of income. The notional and recorded fair values of open positions for derivative instruments are summarized in the following table. The fair values of these derivatives are recorded on the consolidated balance sheets. The fair values below are gross values before netting agreements and netting of cash collateral.
The fair values of Great Plains Energy's and KCP&L's open derivative positions are summarized in the following tables. The tables contain both derivative instruments designated as hedging instruments as well as non-hedging derivatives under GAAP. The fair values below are gross values before netting agreements and netting of cash collateral.
The following tables provide information regarding Great Plains Energy's and KCP&L's offsetting of derivative assets and liabilities at June 30, 2013, and December 31, 2012.
The following tables summarize the amount of gain (loss) recognized in OCI or earnings for interest rate and commodity hedges.
The following table summarizes the amount of loss recognized in a regulatory asset or earnings for GMO utility commodity hedges. GMO utility commodity derivatives fair value changes are recorded to either a regulatory asset or liability consistent with MPSC regulatory orders.
Great Plains Energy's income statement reflects the gain (loss) for the change in fair value of commodity contract derivatives not designated as hedging instruments of $1.0 million for the three months ended June 30, 2013, and an insignificant amount year to date June 30, 2013, and $(0.3) million and $(1.1) million, respectively, for the same periods in 2012. KCP&L's income statement reflects the gain for the change in fair value of commodity contract derivatives not designated as hedging instruments of $1.6 million and $0.6 million, respectively, for the three months ended and year to date June 30, 2013. The amounts recorded in accumulated OCI related to the cash flow hedges are summarized in the following table.
Great Plains Energy's accumulated OCI in the table above at June 30, 2013, includes $19.3 million that is expected to be reclassified to expenses over the next twelve months. KCP&L's accumulated OCI in the table above at June 30, 2013, includes $8.7 million that is expected to be reclassified to expenses over the next twelve months. |
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The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| Fair Value Measurements | 13. FAIR VALUE MEASUREMENTS GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. GAAP establishes a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad categories, giving the highest priority to quoted prices in active markets for identical assets or liabilities and lowest priority to unobservable inputs. A definition of the various levels, as well as discussion of the various measurements within the levels, is as follows: Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets that Great Plains Energy and KCP&L have access to at the measurement date. Assets and liabilities categorized within this level consist of Great Plains Energy's and KCP&L's various exchange traded derivative instruments and equity and U.S. Treasury securities that are actively traded within KCP&L's decommissioning trust fund and GMO's Supplemental Executive Retirement Plan (SERP) rabbi trusts. Level 2 – Market-based inputs for assets or liabilities that are observable (either directly or indirectly) or inputs that are not observable but are corroborated by market data. Assets categorized within this level consist of Great Plains Energy's and KCP&L's various non-exchange traded derivative instruments traded in over-the-counter markets and certain debt securities and fixed income funds within KCP&L's decommissioning trust fund and GMO's SERP rabbi trusts. Level 3 – Unobservable inputs, reflecting Great Plains Energy's and KCP&L's own assumptions about the assumptions market participants would use in pricing the asset or liability. Assets categorized within this level consist of Great Plains Energy's various non-exchange traded derivative instruments traded in over-the-counter markets for which sufficiently observable market data is not available to corroborate the valuation inputs. The following tables include Great Plains Energy's and KCP&L's balances of financial assets and liabilities measured at fair value on a recurring basis at June 30, 2013, and December 31, 2012.
The following tables reconcile the beginning and ending balances for all Level 3 assets and liabilities, net, measured at fair value on a recurring basis for the three months ended and year to date June 30, 2013 and 2012.
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The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| Accumulated Other Comprehensive Income (Loss) [Text Block] | 14. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following tables reflect the change in the balances of each component of accumulated other comprehensive loss for Great Plains Energy and KCP&L year to date June 30, 2013.
(a) Net of tax
The following tables reflect the effect on certain line items of net income from amounts reclassified out of each component of accumulated other comprehensive loss for Great Plains Energy and KCP&L for the three months ended and year to date June 30, 2013.
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The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Income Tax Disclosure [Text Block] | 15. TAXES Components of income tax expense are detailed in the following tables.
Effective Income Tax Rates Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.
Deferred Income Taxes At June 30, 2013, Great Plains Energy's current deferred income tax asset decreased $66.0 million and noncurrent deferred income tax liability decreased $16.8 million compared to December 31, 2012, primarily due to the reclassification of $60.3 million of net operating losses from current deferred income tax asset to noncurrent deferred income tax liability driven by the expected timing of their utilization due to the extension of 50% bonus depreciation with the January 2, 2013, enactment of the American Taxpayer Relief Act of 2012. The decrease in noncurrent deferred income tax liability was offset by an increase in temporary differences mostly as a result of bonus depreciation. Uncertain Tax Positions At June 30, 2013, and December 31, 2012, Great Plains Energy had $22.0 million and $21.4 million, respectively, of liabilities related to unrecognized tax benefits. Of these amounts, $6.7 million and $7.3 million at June 30, 2013, and December 31, 2012, respectively, were expected to impact the effective tax rate if recognized. At June 30, 2013, and December 31, 2012, KCP&L had $11.8 million and $10.5 million, respectively, of liabilities related to unrecognized tax benefits. None of these amounts were expected to impact the effective tax rate if recognized. The following table reflects activity for Great Plains Energy and KCP&L related to the liability for unrecognized tax benefits.
Great Plains Energy and KCP&L recognize interest related to unrecognized tax benefits in interest expense and penalties in non-operating expenses. At June 30, 2013, and December 31, 2012, amounts accrued for interest related to unrecognized tax benefits for Great Plains Energy were $3.3 million and $3.5 million, respectively. Amounts accrued for penalties with respect to unrecognized tax benefits for Great Plains Energy were $0.6 million and $0.7 million at June 30, 2013, and December 31, 2012, respectively. At June 30, 2013, and December 31, 2012, amounts accrued for interest and penalties with respect to unrecognized tax benefits for KCP&L were insignificant. The IRS is currently auditing Great Plains Energy and its subsidiaries for the 2009 tax year. In July 2013, the IRS provided guidance to the Company regarding the audit of certain income tax accounting methods for the capitalization of assets. Based on this new guidance, the Company expects to reduce unrecognized tax benefits for these income tax accounting methods by $11.8 million for Great Plains Energy and KCP&L in the third quarter of 2013. This $11.8 million reduction in unrecognized tax benefits will be offset by an increase to deferred income tax liabilities since a significant portion of the unrecognized tax benefits were related to temporary tax differences. The Company also estimates that it is reasonably possible that $0.9 million for Great Plains Energy of other unrecognized tax benefits may be recognized in the next twelve months due to statute expirations or settlement agreements with tax authorities. |
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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| Segment Reporting [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segments and Related Information | 16. SEGMENTS AND RELATED INFORMATION Great Plains Energy has one reportable segment based on its method of internal reporting, which segregates reportable segments based on products and services, management responsibility and regulation. The one reportable business segment is electric utility, consisting of KCP&L, GMO's regulated utility operations and GMO Receivables Company. Other includes GMO activity other than its regulated utility operations and unallocated corporate charges. The summary of significant accounting policies applies to the reportable segment. Segment performance is evaluated based on net income attributable to Great Plains Energy. The following tables reflect summarized financial information concerning Great Plains Energy's reportable segment.
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The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Regulatory Matters
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6 Months Ended |
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| Regulated Operations [Abstract] | |
| Regulatory Matters | 17. REGULATORY MATTERS KCP&L Missouri Rate Case Proceedings On January 9, 2013, the MPSC issued an order for KCP&L authorizing an increase in annual revenues of $67.4 million effective January 26, 2013. Appeals of the January 9, 2013, MPSC order were filed in February 2013 with the Missouri Court of Appeals, Western District (Court of Appeals) by KCP&L and the Missouri Energy Consumers Group (MECG) regarding various issues. On May 16, 2013, the Court of Appeals granted KCP&L's request to withdraw its appeal. On January 23, 2013, the MPSC issued an order granting expedited treatment and approving compliance tariffs implementing rates reflecting the increase in annual revenues authorized in the January 9, 2013, order. On February 6, 2013, the Office of Public Counsel (OPC) filed a Writ of Mandamus asking the Court of Appeals to direct the MPSC to vacate and rescind its January 23, 2013, order approving the tariffs because the order did not provide the OPC with a reasonable amount of time to review and/or file a motion for rehearing on the tariffs. On March 13, 2013, the Court of Appeals preliminarily found that OPC may be entitled to the relief it requested. On March 28, 2013, the MPSC requested to the Court of Appeals that the OPC be denied its requested relief. The MECG also appealed the January 23, 2013, order in February 2013. The Court of Appeals has not yet issued its decision on the MECG appeal or the Writ of Mandamus. The rates established by the MPSC order are effective unless and until modified by the MPSC or stayed by a court. GMO Missouri Rate Case Proceedings On January 9, 2013, the MPSC issued an order for GMO authorizing an increase in annual revenues of $26.2 million for its Missouri Public Service division and $21.7 million for its St. Joseph Light & Power (L&P) division effective January 26, 2013. Appeals of the January 9, 2013, MPSC order were filed in February 2013 with the Court of Appeals by GMO and MECG regarding various issues. On January 23, 2013, the MPSC issued an order granting expedited treatment and approving compliance tariffs implementing rates reflecting the increase in annual revenues authorized in the January 9, 2013, order. On February 6, 2013, the OPC filed a Writ of Mandamus asking the Court of Appeals to direct the MPSC to vacate and rescind its January 23, 2013, order approving the tariffs because the order did not provide the OPC with a reasonable amount of time to review and/or file a motion for rehearing on the tariffs. On March 13, 2013, the Court of Appeals preliminarily found that OPC may be entitled to the relief it requested. On March 28, 2013, the MPSC requested to the Court of Appeals that the OPC be denied its requested relief. The MECG also appealed the January 23, 2013, order in February 2013. The Court of Appeals has not yet issued its decision on the appeals or the Writ of Mandamus. The rates established by the MPSC order are effective unless and until modified by the MPSC or stayed by a court. |
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The entire disclosure for public utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Significant Accounting Policies (Policies)
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Organization [Policy Text Block] | Organization Great Plains Energy, a Missouri corporation incorporated in 2001, is a public utility holding company and does not own or operate any significant assets other than the stock of its subsidiaries. Great Plains Energy's wholly owned direct subsidiaries with operations or active subsidiaries are as follows:
Each of Great Plains Energy's and KCP&L's consolidated financial statements includes the accounts of their subsidiaries. Intercompany transactions have been eliminated. Great Plains Energy's sole reportable business segment is electric utility. See Note 16 for additional information. |
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| Basic and Diluted Earnings per Common Share Calculation [Policy Text Block] | Basic and Diluted Earnings per Common Share Calculation To determine basic EPS, preferred stock dividend requirements and net loss attributable to noncontrolling interest are deducted from net income before dividing by the average number of common shares outstanding. The effect of dilutive securities, calculated using the treasury stock method, assumes the issuance of common shares applicable to performance shares, restricted stock and Equity Units. Great Plains Energy settled the Equity Units in June 2012. The following table reconciles Great Plains Energy's basic and diluted EPS.
Anti-dilutive shares excluded from the computation of diluted EPS are detailed in the following table.
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Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table reconciles Great Plains Energy's basic and diluted EPS.
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| Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | Anti-dilutive shares excluded from the computation of diluted EPS are detailed in the following table.
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Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Tabular disclosure of an entity's basic and diluted earnings per share calculations. No definition available.
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| Receivables [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of receivables [Table Text Block] | Great Plains Energy's and KCP&L's receivables are detailed in the following table.
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| Schedule of accounts receivable sold [Table Text Block] | Information regarding KCP&L's sale of accounts receivable to KCP&L Receivables Company and GMO's sale of accounts receivable to GMO Receivables Company is reflected in the following tables.
(a) Any net gain (loss) is the result of the timing difference inherent in collecting receivables and over the life of the agreement will net to zero. |
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| X | ||||||||||
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- Definition
Disclosure itemizing the receivables purchased (sold) and the gain (loss) on the sale. It also discloses the cash flows recognized on the sales of receivables. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Nuclear Plant (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Nuclear Plant [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Changes in nuclear decommissioning trust fund | The following table summarizes the change in Great Plains Energy's and KCP&L's nuclear decommissioning trust fund.
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| Detail of assets held in nuclear decommissioning trust fund | The nuclear decommissioning trust is reported at fair value on the balance sheets and is invested in assets as detailed in the following table.
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| Gains and losses from the sale of securities by the nuclear decommissioning trust fund | The costs of securities sold are determined on the basis of specific identification. The following table summarizes the realized gains and losses from the sale of securities in the nuclear decommissioning trust fund.
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| X | ||||||||||
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- Definition
A tabular disclosure that summarizes the change in nuclear decommissioning trust fund during the period. No definition available.
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| X | ||||||||||
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- Definition
This item represents the entire disclosure related to nuclear decommissioning trust fund which consist of all investments in certain debt and equity securities (and other assets). The nuclear decommission fund is maintained to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. No definition available.
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| X | ||||||||||
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- Definition
This item represents the entire disclosure related to realized gain or loss on sale of securities related to nuclear decommissioning trust fund. No definition available.
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- Details
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Pension Plans and Other Employee Benefits (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Defined Benefit Plan Disclosure [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Benefit Costs [Table Text Block] | The following tables provide Great Plains Energy's components of net periodic benefit costs prior to the effects of capitalization and sharing with joint owners of power plants.
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| X | ||||||||||
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- Definition
Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Equity Compensation (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity compensation expense and associated income tax benefits | The following table summarizes Great Plains Energy's and KCP&L's equity compensation expense and the associated income tax benefit.
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| Performance share activity |
* weighted-average |
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| Restricted stock activity | Restricted stock activity year to date June 30, 2013, is summarized in the following table.
* weighted-average |
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| X | ||||||||||
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- Definition
Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the changes in outstanding nonvested performance-based units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the changes in outstanding nonvested restricted stock units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Debt [Table Text Block] | Great Plains Energy's and KCP&L's long-term debt is detailed in the following table.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. No definition available.
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Related Party Transactions and Relationships (Tables)
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6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Related Party Transactions [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of related party receivables and payables | The following table summarizes KCP&L's related party net receivables.
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Tabular disclosure of related party receivables and payables. No definition available.
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- Details
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Derivative Instruments (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Values of open positions for derivative instruments [Table Text Block] | The notional and recorded fair values of open positions for derivative instruments are summarized in the following table. The fair values of these derivatives are recorded on the consolidated balance sheets. The fair values below are gross values before netting agreements and netting of cash collateral.
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| Fair value of open derivative positions, gross values before netting agreements and netting of cash collatral [Table Text Block] | The fair values of Great Plains Energy's and KCP&L's open derivative positions are summarized in the following tables. The tables contain both derivative instruments designated as hedging instruments as well as non-hedging derivatives under GAAP. The fair values below are gross values before netting agreements and netting of cash collateral.
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| Offsetting Derivative Assets and Liabilities [Table Text Block] | The following tables provide information regarding Great Plains Energy's and KCP&L's offsetting of derivative assets and liabilities at June 30, 2013, and December 31, 2012.
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| Gain (loss) recognized in other comprehensive income or earnings for interest rate and commodity hedges [Table Text Block] | The following tables summarize the amount of gain (loss) recognized in OCI or earnings for interest rate and commodity hedges.
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| Gain (loss) recognized in a regulatory balance sheet account or earnings for utility commodity hedges [Table Text Block] | The following table summarizes the amount of loss recognized in a regulatory asset or earnings for GMO utility commodity hedges. GMO utility commodity derivatives fair value changes are recorded to either a regulatory asset or liability consistent with MPSC regulatory orders.
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| Accumulated other comprehensive income related to cash flow hedges [Table Text Block] | The amounts recorded in accumulated OCI related to the cash flow hedges are summarized in the following table.
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This element can be used for disclosing the entity's tabular disclosure of utility commodity derivatives fair value changes recorded to either a regulatory asset or liability consistent with Missouri Public Service Commission regulatory orders No definition available.
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- Definition
[Table Text Block] for Tabular disclosure of derivative assets and liabilities that are subject to offsetting, including master netting arrangements. [Table] No definition available.
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This element can be used for disclosing the entity's tabular disclosure cash flow hedges included in accumulated other comprehensive income. No definition available.
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- Definition
Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value Measurements (Tables)
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Jun. 30, 2013
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of assets and liabilities | The following tables include Great Plains Energy's and KCP&L's balances of financial assets and liabilities measured at fair value on a recurring basis at June 30, 2013, and December 31, 2012.
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| Unobservable inputs reconciliation | The following tables reconcile the beginning and ending balances for all Level 3 assets and liabilities, net, measured at fair value on a recurring basis for the three months ended and year to date June 30, 2013 and 2012.
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- Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Accumulated Other Comprehensive Income (Loss) (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Accumulated Other Comprehensive Income (Loss) [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following tables reflect the change in the balances of each component of accumulated other comprehensive loss for Great Plains Energy and KCP&L year to date June 30, 2013.
(a) Net of tax
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| Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following tables reflect the effect on certain line items of net income from amounts reclassified out of each component of accumulated other comprehensive loss for Great Plains Energy and KCP&L for the three months ended and year to date June 30, 2013.
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- Definition
Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). No definition available.
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- Definition
Tabular disclosure of the components of accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Components of income tax expense are detailed in the following tables.
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| Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Effective Income Tax Rates Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.
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| Summary of Income Tax Contingencies [Table Text Block] | The following table reflects activity for Great Plains Energy and KCP&L related to the liability for unrecognized tax benefits.
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- Details
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- Definition
Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Segments and Related Information (Tables)
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Jun. 30, 2013
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| Segment Reporting [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment financial information | The following tables reflect summarized financial information concerning Great Plains Energy's reportable segment.
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| X | ||||||||||
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- Definition
Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Summary of Significant Accounting Policies Summary of Significant Accounting Policies Utility Plant (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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|---|---|---|
| Utility Plant, at original cost | ||
| Public Utilities, Property, Plant and Equipment, Plant in Service | $ 11,387.8 | $ 11,160.5 |
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Kansas City Power and Light Company [Member]
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| Utility Plant, at original cost | ||
| Public Utilities, Property, Plant and Equipment, Plant in Service | $ 8,118.6 | $ 7,971.4 |
| X | ||||||||||
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- Definition
Period end amount of total gross PPE. No definition available.
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| X | ||||||||||
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- Details
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Summary of Significant Accounting Policies Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Income [Abstract] | ||||
| Net income (loss) | $ 63.6 | $ 58.1 | $ 89.6 | $ 48.8 |
| Less: net income (loss) attributable to noncontrolling interest | 0 | 0 | 0 | (0.2) |
| Less: preferred stock dividend requirements | 0.4 | 0.4 | 0.8 | 0.8 |
| Earnings (loss) available for common shareholders | $ 63.2 | $ 57.7 | $ 88.8 | $ 48.2 |
| Common Shares Outstanding [Abstract] | ||||
| Average number of common shares outstanding (in shares) | 153.5 | 139.6 | 153.4 | 137.7 |
| Add: effect of dilutive securities (in shares) | 0.3 | 2.4 | 0.3 | 2.9 |
| Diluted average number of common shares outstanding (in shares) | 153.8 | 142.0 | 153.7 | 140.6 |
| Earnings per share [Abstract] | ||||
| Earnings Per Share, Basic | $ 0.41 | $ 0.41 | $ 0.58 | $ 0.35 |
| Earnings Per Share, Diluted | $ 0.41 | $ 0.41 | $ 0.58 | $ 0.34 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of net income or loss for the period allocated to noncontrolling shareholders, unit holders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than those noncontrolling interests already defined within the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. No definition available.
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| X | ||||||||||
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Summary of Significant Accounting Policies Antidilutive Securities (Details)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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|
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Performance Shares [Member]
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||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 55,271 | 0 | 55,271 | 0 |
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Restricted Stock [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 10,617 | 21,652 | 10,617 |
| X | ||||||||||
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- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Summary of Significant Accounting Policies Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
6 Months Ended |
|---|---|
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Jun. 30, 2013
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| Dividends Declared [Abstract] | |
| Subsequent Event Amount | $ 11.8 |
| Subsequent Event Description | In July 2013, the IRS provided guidance to the Company regarding the audit of certain income tax accounting methods for the capitalization of assets. Based on this new guidance, the Company expects to reduce unrecognized tax benefits for these income tax accounting methods by $11.8 million for Great Plains Energy and KCP&L in the third quarter of 2013. This $11.8 million reduction in unrecognized tax benefits will be offset by an increase to deferred income tax liabilities since a significant portion of the unrecognized tax benefits were related to temporary tax differences. |
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Dividend Declared [Member]
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| Dividends Declared [Abstract] | |
| Subsequent Event Date | Aug. 06, 2013 |
| Subsequent Event Description | Great Plains Energy’s Board of Directors declared a quarterly dividend on common stock and also declared regular dividends on Great Plains Energy's preferred stock. |
| Subsequent per common share amount (in dollars per share) | $ 0.2175 |
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Dividend Declared [Member] | Kansas City Power and Light Company [Member]
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| Dividends Declared [Abstract] | |
| Subsequent Event Date | Aug. 06, 2013 |
| Subsequent Event Amount | $ 23.0 |
| Subsequent Event Description | KCP&L’s Board of Directors declared a cash dividend payable to Great Plains Energy |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Reflects the per common share amount of dividends declared subsequent to year end. No definition available.
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| X | ||||||||||
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- Definition
Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2013
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Jun. 30, 2012
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| Cash flows affected by changes in: | ||
| Receivables | $ (25.9) | $ 27.3 |
| Accounts receivable pledged as collateral | (1.0) | (67.0) |
| Fuel inventories | (7.2) | (13.7) |
| Materials and supplies | (2.1) | (5.7) |
| Accounts payable | (116.3) | (53.7) |
| Accrued taxes | 43.7 | 33.8 |
| Accrued interest | (0.2) | (3.6) |
| Deferred refueling outage costs | (26.4) | 9.0 |
| Pension and post-retirement benefit obligations | 21.0 | 13.5 |
| Increase (Decrease) in Allowance for Equity Funds Used During Construction | (5.0) | (0.1) |
| Fuel recovery mechanism | (6.4) | 10.5 |
| Other operating activities | (13.6) | (13.1) |
| Total other operating activities | (139.4) | (62.8) |
| Cash paid during the period: | ||
| Interest Paid, Net | 87.2 | 130.5 |
| Income Taxes Paid | 0.2 | 3.3 |
| Non-cash investing activities: | ||
| Liabilities accrued for capital expenditures | 32.8 | 48.9 |
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Kansas City Power and Light Company [Member]
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| Cash flows affected by changes in: | ||
| Receivables | (5.2) | 13.8 |
| Accounts receivable pledged as collateral | 0 | (11.0) |
| Fuel inventories | (7.5) | (12.7) |
| Materials and supplies | (1.7) | (4.5) |
| Accounts payable | (85.8) | (36.5) |
| Accrued taxes | 29.8 | 25.2 |
| Accrued interest | 0.1 | (3.5) |
| Deferred refueling outage costs | (26.4) | 9.0 |
| Pension and post-retirement benefit obligations | 22.3 | 14.9 |
| Increase (Decrease) in Allowance for Equity Funds Used During Construction | (5.0) | 0 |
| Fuel recovery mechanism | (3.1) | (4.4) |
| Other operating activities | (10.7) | (16.4) |
| Total other operating activities | (93.2) | (26.1) |
| Cash paid during the period: | ||
| Interest Paid, Net | 57.4 | 61.3 |
| Income Taxes Paid | 0 | 0 |
| Non-cash investing activities: | ||
| Liabilities accrued for capital expenditures | $ 29.2 | $ 44.3 |
| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the amount due within one year (or one business cycle) from customers for the credit sale of goods and services where those amounts have been pledged as collateral. No definition available.
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| X | ||||||||||
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- Definition
The increase (decrease) in deferred refueling outage costs. No definition available.
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| X | ||||||||||
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- Definition
Total of increase or decrease in operating capital plus other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities. No definition available.
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| X | ||||||||||
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- Definition
Future cash outflow to pay for construction in progress expenditures that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes. No definition available.
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the capitalized cost of equity (based on assumed rate of return) and / or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. As a result of this capitalization, net income is increased. This element pertains to certain regulated industries, such as public utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the value of fuel held in inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the value of the asset or liability created by an over or under recovery. An over under-recovery means that the basic energy price based on the daily product price and exchange rate is less (over) or more (under) than the basic energy price used in the calculation of the monthly retail energy product. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the value of raw materials, packaging materials and supplies held in inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities). No definition available.
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| X | ||||||||||
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- Details
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Receivables Accounts, Notes, and Financing (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Allowance for doubtful accounts | $ (5.0) | $ (2.6) |
| Other Receivables, Gross, Current | 77.3 | 98.8 |
| Receivables, net | 180.8 | 154.5 |
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Kansas City Power and Light Company [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Allowance for doubtful accounts | (2.9) | (1.5) |
| Other Receivables, Gross, Current | 62.9 | 81.8 |
| Receivables, net | 208.4 | 163.2 |
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Trade Accounts Receivable [Member] | Unbilled Revenues [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | 108.5 | 58.3 |
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Trade Accounts Receivable [Member] | Unbilled Revenues [Member] | Kansas City Power and Light Company [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | 72.9 | 42.9 |
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Intercompany Receivables [Member] | Kansas City Power and Light Company [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | $ 75.5 | $ 40.0 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amounts of other receivables due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed. No definition available.
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| X | ||||||||||
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- Definition
The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Receivables Narrative (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
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Jun. 30, 2013
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Dec. 31, 2012
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| Accounts receivable pledged as collateral | $ 175.0 | $ 174.0 |
| Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 175.0 | 174.0 |
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Kansas City Power and Light Company [Member]
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| Accounts receivable pledged as collateral | 110.0 | 110.0 |
| Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 110.0 | 110.0 |
| Contractually Specified Servicing Fees Percentage Amount | 1.50% | |
| Maximum amount of outstanding principal under receivables agreement | 110 | |
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KCPL Greater Missouri Operations [Member]
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| Contractually Specified Servicing Fees Percentage Amount | 1.25% | |
| Maximum amount of outstanding principal under receivables agreement from June 1 to October 31 of each year | 80 | |
| Maximum amount of outstanding principal under receivables agreement from November 1 to May 31 of each year | $ 65 |
| X | ||||||||||
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- Definition
Percentage amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. No definition available.
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| X | ||||||||||
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- Definition
Maximum amount of outstanding principal under receivables agreement No definition available.
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| X | ||||||||||
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- Definition
Maximum amount of outstanding principal under receivables agreement from June 1 to October 31 of each year. No definition available.
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| X | ||||||||||
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- Definition
Maximum amount of outstanding principal under receivables agreement from November 1 to May 31 of each year No definition available.
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| X | ||||||||||
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- Definition
Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Receivables (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | $ 0 | $ 0 | $ 0 | $ 0 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (0.6) | [1] | (1.1) | [1] | (0.6) | [1] | (0.7) | [1] | ||
| Servicing fees received (paid) | 0 | 0 | 0 | 0 | ||||||
| Fees paid to outside investor | (0.3) | (0.4) | (0.9) | (0.7) | ||||||
| Cash from customers (transferred) received | 0 | 0 | 0 | 0 | ||||||
| Cash received from (paid for) receivables purchased | 0 | 0 | 0 | 0 | ||||||
| Intercompany Interest Income (Expense) On Notes | 0 | 0 | ||||||||
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Kansas City Power and Light Company [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | 0 | 0 | 0 | 0 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (0.4) | [1] | (0.7) | [1] | (0.4) | [1] | (0.3) | [1] | ||
| Servicing fees received (paid) | 0 | 0 | 0 | 0 | ||||||
| Fees paid to outside investor | (0.3) | (0.3) | (0.6) | (0.6) | ||||||
| Cash from customers (transferred) received | 0 | 0 | 0 | 0 | ||||||
| Cash received from (paid for) receivables purchased | 0 | 0 | 0 | 0 | ||||||
| Intercompany Interest Income (Expense) On Notes | 0 | 0 | ||||||||
|
Kansas City Power And Light Company Unconsolidated [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | (373.3) | (368.6) | (708.0) | (662.1) | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (4.8) | [1] | (4.7) | [1] | (9.0) | [1] | (8.4) | [1] | ||
| Servicing fees received (paid) | 0.6 | 0.6 | 1.2 | 1.1 | ||||||
| Fees paid to outside investor | 0 | 0 | 0 | 0 | ||||||
| Cash from customers (transferred) received | (345.6) | (319.4) | (682.3) | (646.6) | ||||||
| Cash received from (paid for) receivables purchased | 341.3 | 315.3 | 673.8 | 638.4 | ||||||
| Intercompany Interest Income (Expense) On Notes | 0.1 | 0.1 | ||||||||
|
KCPL Receivables Company [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | 373.3 | 368.6 | 708.0 | 662.1 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | 4.4 | [1] | 4.0 | [1] | 8.6 | [1] | 8.1 | [1] | ||
| Servicing fees received (paid) | (0.6) | (0.6) | (1.2) | (1.1) | ||||||
| Fees paid to outside investor | (0.3) | (0.3) | (0.6) | (0.6) | ||||||
| Cash from customers (transferred) received | 345.6 | 319.4 | 682.3 | 646.6 | ||||||
| Cash received from (paid for) receivables purchased | (341.3) | (315.3) | (673.8) | (638.4) | ||||||
| Intercompany Interest Income (Expense) On Notes | (0.1) | (0.1) | ||||||||
|
KCPL Greater Missouri Operations [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | (202.7) | (91.7) | (388.1) | (91.7) | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (2.6) | [1] | (1.2) | [1] | (4.9) | [1] | (1.2) | [1] | ||
| Servicing fees received (paid) | 0.3 | 0.1 | 0.6 | 0.1 | ||||||
| Fees paid to outside investor | 0 | 0 | 0 | 0 | ||||||
| Cash from customers (transferred) received | (184.6) | (64.7) | (369.5) | (64.7) | ||||||
| Cash received from (paid for) receivables purchased | 182.3 | 63.9 | 364.9 | 63.9 | ||||||
| Intercompany Interest Income (Expense) On Notes | 0 | 0 | ||||||||
|
GMO Receivables Company Member
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | 202.7 | 91.7 | 388.1 | 91.7 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | 2.4 | [1] | 0.8 | [1] | 4.7 | [1] | 0.8 | [1] | ||
| Servicing fees received (paid) | (0.3) | (0.1) | (0.6) | (0.1) | ||||||
| Fees paid to outside investor | 0 | (0.1) | (0.3) | (0.1) | ||||||
| Cash from customers (transferred) received | 184.6 | 64.7 | 369.5 | 64.7 | ||||||
| Cash received from (paid for) receivables purchased | (182.3) | (63.9) | (364.9) | (63.9) | ||||||
| Intercompany Interest Income (Expense) On Notes | $ 0 | $ 0 | ||||||||
|
||||||||||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
All amounts that are due or paid to outside investor related specifically to accounts receivable sold. No definition available.
|
| X | ||||||||||
|
- Definition
Cash received from (paid to) transferring entity for sale of accounts receivable No definition available.
|
| X | ||||||||||
|
- Definition
Amount received (paid) for interest on intercompany notes No definition available.
|
| X | ||||||||||
|
- Definition
Cash received from customers or (transferred) to receivables company. No definition available.
|
| X | ||||||||||
|
- Definition
Receivables (sold) to wholly owned subsidiary receivables company or purchased by parent company. No definition available.
|
| X | ||||||||||
|
- Definition
All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Reflects the net positive or negative amount derived from subtracting from net proceeds of sale, the carrying amounts, net of allocated reserves, of accounts receivable transferred to a third party in a transaction that qualifies for sales treatment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Nuclear Plant (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | $ 134.8 | $ 134.8 | $ 130.4 | |||
| Gross Unrealized Gains | 32.2 | 32.2 | 26.0 | |||
| Gross Unrealized Losses | (2.3) | (2.3) | (1.7) | |||
| Fair Value, Nuclear decommissioning trust fund | 164.7 | 164.7 | 154.7 | 135.3 | ||
| Weighted average maturity of debt securities (in years) | 7 | 7 | ||||
| Realized Gains on investments in decommissioning trust fund | 0.4 | 0.2 | 1.9 | 0.7 | ||
| Realized Losses on investments in decommissioning trust fund | 0 | (0.1) | (0.4) | (0.2) | ||
|
Equity Securities [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | 82.5 | 82.5 | 80.6 | |||
| Gross Unrealized Gains | 29.2 | 29.2 | 21.1 | |||
| Gross Unrealized Losses | (1.8) | (1.8) | (1.6) | |||
| Fair Value, Nuclear decommissioning trust fund | 109.9 | 109.9 | 100.1 | |||
|
Debt Securities [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | 46.6 | 46.6 | 46.6 | |||
| Gross Unrealized Gains | 3.0 | 3.0 | 4.9 | |||
| Gross Unrealized Losses | (0.5) | (0.5) | (0.1) | |||
| Fair Value, Nuclear decommissioning trust fund | 49.1 | 49.1 | 51.4 | |||
|
Other Securities [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | 5.7 | 5.7 | 3.2 | |||
| Gross Unrealized Gains | 0 | 0 | 0 | |||
| Gross Unrealized Losses | 0 | 0 | 0 | |||
| Fair Value, Nuclear decommissioning trust fund | 5.7 | 5.7 | 3.2 | |||
|
Kansas City Power and Light Company [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Fair Value, Nuclear decommissioning trust fund | $ 164.7 | $ 164.7 | $ 154.7 | |||
| X | ||||||||||
|
- Definition
This represents the weighted average number of years when the debt securities held in the decommissioning trust fund are scheduled to be fully repaid. No definition available.
|
| X | ||||||||||
|
- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. No definition available.
|
| X | ||||||||||
|
- Definition
Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Nuclear Plant Decommissioning Trust (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
|
| Nuclear decommissioning trust fund [Roll Forward] | ||
| Nuclear decommissioning trust fund, beginning balance | $ 154.7 | $ 135.3 |
| Contributions to nuclear decommissioning trust fund | 1.7 | 3.3 |
| Nuclear decommissioning trust fund earned income, net of fees | 1.2 | 3.0 |
| Net realized gains (losses) on nuclear decommissioning trust fund | 1.5 | 1.0 |
| Net unrealized gains (losses) on nuclear decommissioning trust fund | 5.6 | 12.1 |
| Nuclear decommissioning trust fund, ending balance | 164.7 | 154.7 |
|
Kansas City Power and Light Company [Member]
|
||
| Nuclear decommissioning trust fund [Roll Forward] | ||
| Nuclear decommissioning trust fund, ending balance | $ 164.7 | $ 154.7 |
|
Wolf Creek Unit [Member] | Kansas City Power and Light Company [Member]
|
||
| Jointly Owned Utility Plant Interests [Line Items] | ||
| Ownership percentage in Wolf Creek, a nuclear generating unit (in hundredths) | 47.00% |
| X | ||||||||||
|
- Definition
This represents total contributions to the decommissioning trust fund during the current period. No definition available.
|
| X | ||||||||||
|
- Definition
This represents income earned, net of fees, on decommissioning trust fund investments during the current period. No definition available.
|
| X | ||||||||||
|
- Definition
This represents the net realized gains (losses) on decommissioning trust fund investments during the current period. No definition available.
|
| X | ||||||||||
|
- Definition
This represents the net unrealized gains (losses) on decommissioning trust fund investments during the current period. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The proportionate share of interest (percent) in a jointly owned utility plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Pension Plans and Other Employee Benefits (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Dec. 31, 2012
|
|
| Amounts recognized in the consolidated balance sheets [Abstract] | |||||
| Pension and Other Postretirement Defined Benefit Plans, Current Liabilities | $ (2.8) | $ (2.8) | $ (2.8) | ||
| Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent | (549.9) | (549.9) | (557.5) | ||
| Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income Regulatory Assets/Liabilities [Abstract] | |||||
| Amortization of net losses included in net periodic benefit costs | (0.3) | (0.1) | (0.3) | (0.2) | |
|
Kansas City Power and Light Company [Member]
|
|||||
| Amounts recognized in the consolidated balance sheets [Abstract] | |||||
| Pension and Other Postretirement Defined Benefit Plans, Current Liabilities | (1.4) | (1.4) | (1.4) | ||
| Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent | (527.1) | (527.1) | (534.5) | ||
|
Pension Plans, Defined Benefit [Member]
|
|||||
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Defined Benefit Plan, Contributions by Employer | 32.4 | ||||
| Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 25.0 | 25.0 | |||
| Components of net periodic benefit costs [Abstract] | |||||
| Service cost | 10.5 | 8.8 | 21.0 | 17.7 | |
| Interest cost | 11.8 | 12.3 | 23.6 | 24.5 | |
| Defined Benefit Plan, Expected Return on Plan Assets | (11.8) | (10.7) | (23.6) | (21.4) | |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0.5 | 1.1 | 1.0 | 2.2 | |
| Defined Benefit Plan, Amortization of Gains (Losses) | 13.7 | 11.2 | 27.4 | 22.3 | |
| Defined Benefit Plan, Amortization of Transition Obligations (Assets) | 0 | 0 | 0 | 0 | |
| Net periodic benefit costs before regulatory adjustment | 24.7 | 22.7 | 49.4 | 45.3 | |
| Defined benefit plan, regulatory adjustment | (2.8) | (3.8) | (6.4) | (7.7) | |
| Defined Benefit Plan, Net Periodic Benefit Cost | 21.9 | 18.9 | 43.0 | 37.6 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 18.7 | 18.7 | |||
| Components of net periodic benefit costs [Abstract] | |||||
| Service cost | 1.1 | 0.8 | 2.2 | 1.6 | |
| Interest cost | 1.9 | 2.0 | 3.8 | 3.9 | |
| Defined Benefit Plan, Expected Return on Plan Assets | (0.5) | (0.4) | (1.0) | (0.9) | |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 1.8 | 1.8 | 3.6 | 3.6 | |
| Defined Benefit Plan, Amortization of Gains (Losses) | 0.4 | 0 | 0.9 | 0 | |
| Defined Benefit Plan, Amortization of Transition Obligations (Assets) | 0.1 | 0.2 | 0.1 | 0.5 | |
| Net periodic benefit costs before regulatory adjustment | 4.8 | 4.4 | 9.6 | 8.7 | |
| Defined benefit plan, regulatory adjustment | (0.6) | 0.3 | (1.1) | 0.7 | |
| Defined Benefit Plan, Net Periodic Benefit Cost | $ 4.2 | $ 4.7 | $ 8.5 | $ 9.4 | |
| X | ||||||||||
|
- Definition
The element used to encapsulate periodic benefit costs related to regulatory adjustments. No definition available.
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period before regulatory adjustment. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the transition obligation or asset recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. No definition available.
|
| X | ||||||||||
|
- Definition
An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Before tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Equity Compensation (Details) (USD $)
|
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Equity compensation expense | $ 300,000 | $ 1,800,000 | $ 2,100,000 | $ 2,800,000 | ||||
| Income tax benefit | 100,000 | 700,000 | 700,000 | 1,300,000 | ||||
|
Performance Shares [Member]
|
||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Expected volatility | 19.00% | |||||||
| Expected dividend yield | 3.88% | |||||||
| Risk-free interest rate | 0.35% | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] | ||||||||
| Beginning balance (in shares) | 370,560 | |||||||
| Granted (in shares) | 224,121 | |||||||
| Earned (in shares) | (104,453) | |||||||
| Forfeited (in shares) | (3,036) | |||||||
| Performance adjustment (in shares) | (51,542) | |||||||
| Ending balance (in shares) | 435,650 | 435,650 | ||||||
| Weighted average beginning balance (in dollars per share) | $ 23.05 | [1] | ||||||
| Weighted average granted (in dollars per share) | $ 0 | $ 20.99 | $ 24.16 | [1] | $ 19.01 | |||
| Weighted average earned (in dollars per share) | $ 23.37 | [1] | ||||||
| Weighted average forfeited (in dollars per share) | $ 24.33 | [1] | ||||||
| Weighted average performance adjustment (in dollars per share) | $ 23.37 | [1] | ||||||
| Weighted average ending balance (in dollars per share) | $ 23.49 | [1] | $ 23.49 | [1] | ||||
| Total unrecognized compensation expense | 5,000,000 | 5,000,000 | ||||||
| Remaining weighted-average contractual term (in years) | 1 year 10 months | |||||||
| Fair value of performance shares earned and paid | 2,400,000 | 0 | ||||||
|
Restricted Stock [Member]
|
||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] | ||||||||
| Beginning balance (in shares) | 277,439 | |||||||
| Granted (in shares) | 74,728 | |||||||
| Forfeited (in shares) | (1,013) | |||||||
| Vested (in shares) | (33,802) | |||||||
| Ending balance (in shares) | 317,352 | 317,352 | ||||||
| Weighted average beginning balance (in dollars per share) | $ 19.03 | [1] | ||||||
| Weighted average granted (in dollars per share) | $ 0 | $ 19.89 | $ 22.45 | [1] | $ 19.69 | |||
| Weighted average vested (in dollars per share) | $ 17.41 | [1] | ||||||
| Weighted average forfeited (in dollars per share) | $ 22.78 | [1] | ||||||
| Weighted average ending balance (in dollars per share) | $ 19.98 | [1] | $ 19.98 | [1] | ||||
| Total unrecognized compensation expense | 3,200,000 | 3,200,000 | ||||||
| Total fair value of shares vested | 1,300,000 | 600,000 | 3,200,000 | |||||
| Remaining weighted-average contractual term (in years) | 1 year 7 months | |||||||
|
Kansas City Power and Light Company [Member]
|
||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Equity compensation expense | 200,000 | 1,400,000 | 1,500,000 | 2,100,000 | ||||
| Income tax benefit | $ 0 | $ 500,000 | $ 400,000 | $ 1,000,000 | ||||
|
||||||||
| X | ||||||||||
|
- Definition
The total fair value of equity-based awards for which the grantee earned and was paid during the reporting period by satisfying service and performance requirements. No definition available.
|
| X | ||||||||||
|
- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were earned during the reporting period. No definition available.
|
| X | ||||||||||
|
- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee earned the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. No definition available.
|
| X | ||||||||||
|
- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were adjusted during the reporting period based on performance criteria. No definition available.
|
| X | ||||||||||
|
- Definition
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were adjusted during the reporting period based on performance criteria. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Short-term Borrowings and Short-term Bank Lines of Credit (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
|
| Short-term Debt [Line Items] | ||
| Amount of outstanding cash borrowings | $ 6.0 | $ 12.0 |
| Commercial paper outstanding | 385.0 | 530.1 |
|
Parent Company [Member]
|
||
| Short-term Debt [Line Items] | ||
| Amount of revolving credit facility | 200 | |
| Revolving credit facility expiration date | Dec. 01, 2016 | |
| Covenant term - amount considered in default | 50.0 | |
| Covenant Term Ratio of Consolidated Indebtedness to Consolidated Capitalization Ratio, Maximum | 0.65 | |
| Line of Credit Facility, Covenant Compliance | in compliance | |
| Amount of outstanding cash borrowings | 6.0 | 12.0 |
| Weighted-average interest rate from outstanding borrowings | 2.00% | 2.00% |
| Amount of letters of credit outstanding | 1.8 | 1.8 |
|
Kansas City Power and Light Company [Member]
|
||
| Short-term Debt [Line Items] | ||
| Amount of revolving credit facility | 600 | |
| Revolving credit facility expiration date | Dec. 01, 2016 | |
| Covenant term - amount considered in default | 50.0 | |
| Covenant Term Ratio of Consolidated Indebtedness to Consolidated Capitalization Ratio, Maximum | 0.65 | |
| Line of Credit Facility, Covenant Compliance | in compliance | |
| Amount of outstanding cash borrowings | 0 | 0 |
| Commercial paper outstanding | 200.0 | 361.0 |
| Weighted-average interest rate from outstanding borrowings | 0.35% | 0.48% |
| Amount of letters of credit outstanding | 5.3 | 13.9 |
|
KCPL Greater Missouri Operations [Member]
|
||
| Short-term Debt [Line Items] | ||
| Amount of revolving credit facility | 450 | |
| Revolving credit facility expiration date | Dec. 01, 2016 | |
| Covenant term - amount considered in default | 50.0 | |
| Covenant Term Ratio of Consolidated Indebtedness to Consolidated Capitalization Ratio, Maximum | 0.65 | |
| Line of Credit Facility, Covenant Compliance | in compliance | |
| Amount of outstanding cash borrowings | 0 | 0 |
| Commercial paper outstanding | 185.0 | 169.1 |
| Weighted-average interest rate from outstanding borrowings | 0.80% | 0.94% |
| Amount of letters of credit outstanding | $ 15.1 | $ 15.1 |
| X | ||||||||||
|
- Definition
Amount of other indebtedness considered a default under the revolving credit facility. No definition available.
|
| X | ||||||||||
|
- Definition
The maximum ratio of consolidated indebtedness to consolidated capitalization ratio, as defined in the agreement that the company is required to comply with at all times. No definition available.
|
| X | ||||||||||
|
- Definition
Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
|
| X | ||||||||||
|
- Definition
Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Date the credit facility terminates, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying amount at the balance sheet date of borrowings from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
||||||||
| Debt Instrument [Line Items] | |||||||||
| Current maturities | $ (257.1) | $ (263.1) | |||||||
| Long-term debt excluding current maturities | 3,165.9 | 2,756.8 | |||||||
|
Kansas City Power and Light Company [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Current maturities | 0 | (0.4) | |||||||
| Unamortized discount | (4.2) | (4.0) | |||||||
| Long-term debt excluding current maturities | 2,312.1 | 1,901.7 | |||||||
|
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds EIRR due 2015-2035 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 146.4 | 106.9 | |||||||
| Debt Instrument Maturity Date Range Start | Dec. 31, 2015 | ||||||||
| Debt Instrument Maturity Date Range End | Dec. 31, 2035 | ||||||||
| Long-term Debt, Weighted Average Interest Rate | 2.95% | [1] | |||||||
|
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds Series 2009 due 2019 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 400.0 | 400.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2019 | ||||||||
| Interest rates (in hundredths) | 7.15% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 8.59% | [2] | |||||||
|
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds EIRR series 2005 due 2035 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 50.0 | 50.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2035 | ||||||||
| Interest rates (in hundredths) | 4.65% | ||||||||
|
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds EIRR series 2007B due 2035 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 0 | 73.2 | |||||||
| Interest rates (in hundredths) | 5.375% | ||||||||
|
Kansas City Power and Light Company [Member] | Corporate Debt Securities [Member] | Senior notes due 2017 KCPL [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 250.0 | 250.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2017 | ||||||||
| Interest rates (in hundredths) | 5.85% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 5.72% | [2] | |||||||
|
Kansas City Power and Light Company [Member] | Corporate Debt Securities [Member] | Senior notes due 2018 KCPL [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 350.0 | 350.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2018 | ||||||||
| Interest rates (in hundredths) | 6.375% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 7.49% | [2] | |||||||
|
Kansas City Power and Light Company [Member] | Corporate Debt Securities [Member] | Senior Notes due 2023 KCPL [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 300.0 | 0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2023 | ||||||||
| Interest rates (in hundredths) | 3.15% | ||||||||
|
Kansas City Power and Light Company [Member] | Corporate Debt Securities [Member] | Senior notes due 2035 KCPL [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 250.0 | 250.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2035 | ||||||||
| Interest rates (in hundredths) | 6.05% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 5.78% | [2] | |||||||
|
Kansas City Power and Light Company [Member] | Corporate Debt Securities [Member] | Senior Notes Due 2041 KCPL [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 400.0 | 400.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2041 | ||||||||
| Interest rates (in hundredths) | 5.30% | ||||||||
|
Kansas City Power and Light Company [Member] | Environmental Improvement Revenue Refunding Bonds [Member] | Remarketed EIRR Bonds Series 2007A and 2007B due 2035 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 146.5 | 0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2035 | ||||||||
| Variable rate (in hundredths) | 0.089% | [3] | |||||||
|
Kansas City Power and Light Company [Member] | Environmental Improvement Revenue Refunding Bonds [Member] | EIRR bonds 4.90 percent Series 2008 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 23.4 | 23.4 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2038 | ||||||||
| Interest rates (in hundredths) | 4.90% | ||||||||
|
Kansas City Power and Light Company [Member] | Other Long-Term Debt [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 0 | 2.6 | |||||||
|
KCPL Greater Missouri Operations [Member] | GMO First Mortgage Bonds [Member] | First Mortgage Bonds due through 2021 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 9.0 | 10.1 | |||||||
| Debt Instrument Maturity Date Range Start | Dec. 31, 2014 | ||||||||
| Debt Instrument Maturity Date Range End | Dec. 31, 2021 | ||||||||
| Interest rates (in hundredths) | 9.44% | ||||||||
|
KCPL Greater Missouri Operations [Member] | GMO Pollution Control Bonds [Member] | Pollution control bonds Wamego Series 1996 due 2026 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 7.3 | 7.3 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2026 | ||||||||
| Variable rate (in hundredths) | 0.189% | [3] | |||||||
|
KCPL Greater Missouri Operations [Member] | GMO Pollution Control Bonds [Member] | Pollution control bonds state environmental 1993 due 2028 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 5.0 | 5.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2028 | ||||||||
| Variable rate (in hundredths) | 0.192% | [3] | |||||||
|
KCPL Greater Missouri Operations [Member] | GMO Pollution Control Bonds [Member] | Pollution control bonds SJLP due 2013 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 0 | 5.6 | |||||||
| Interest rates (in hundredths) | 5.85% | ||||||||
|
KCPL Greater Missouri Operations [Member] | GMO Senior Notes [Member] | Senior notes 8.27 percent series due 2021 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 80.9 | 80.9 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2021 | ||||||||
| Interest rates (in hundredths) | 8.27% | ||||||||
|
KCPL Greater Missouri Operations [Member] | GMO Medium Term Notes [Member] | Medium term notes 7.16 percent series due 2013 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 6.0 | 6.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2013 | ||||||||
| Interest rates (in hundredths) | 7.16% | ||||||||
|
KCPL Greater Missouri Operations [Member] | GMO Medium Term Notes [Member] | Medium term notes 7.33 percent series due 2023 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 3.0 | 3.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2023 | ||||||||
| Interest rates (in hundredths) | 7.33% | ||||||||
|
KCPL Greater Missouri Operations [Member] | GMO Medium Term Notes [Member] | Medium term notes 7.17 percent series due 2023 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 7.0 | 7.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2023 | ||||||||
| Interest rates (in hundredths) | 7.17% | ||||||||
|
Parent Company [Member] | Great Plains Energy Senior Notes [Member] | Senor notes due 2013 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 250.0 | 250.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2013 | ||||||||
| Interest rates (in hundredths) | 2.75% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 3.67% | [2] | |||||||
|
Parent Company [Member] | Great Plains Energy Senior Notes [Member] | Senior notes due 2017 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 100.0 | 100.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2017 | ||||||||
| Interest rates (in hundredths) | 6.875% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 7.33% | [2] | |||||||
|
Parent Company [Member] | Great Plains Energy Senior Notes [Member] | Senior Notes Due 2021 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 350.0 | 350.0 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2021 | ||||||||
| Interest rates (in hundredths) | 4.85% | ||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 7.34% | [2] | |||||||
|
Parent Company [Member] | Great Plains Energy Senior Notes [Member] | Senior Notes Due 2022 [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Principal outstanding | 287.5 | 287.5 | |||||||
| Debt Instrument, Maturity Date | Dec. 31, 2022 | ||||||||
| Interest rates (in hundredths) | 5.292% | ||||||||
|
Other Consolidated Entities [Member]
|
|||||||||
| Debt Instrument [Line Items] | |||||||||
| Current maturities | (257.1) | (262.7) | |||||||
| Unarmortized discount and premium, net | $ 5.2 | $ 5.4 | |||||||
|
|||||||||
| X | ||||||||||
|
- Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The effective interest rate at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time. No definition available.
|
|
Long-Term Debt Long-Term Debt Fair Value (Details) (USD $)
In Billions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
|
Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term Debt | $ 3.4 | $ 3.0 |
|
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Kansas City Power and Light Company [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term Debt | 2.3 | 1.9 |
|
Estimate of Fair Value, Fair Value Disclosure [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term debt fair value | 3.7 | 3.5 |
|
Estimate of Fair Value, Fair Value Disclosure [Member] | Kansas City Power and Light Company [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term debt fair value | $ 2.5 | $ 2.2 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
|
|
Long-Term Debt Long-Term Debt Remarketed (Details) (Kansas City Power and Light Company [Member], USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2013
|
|
|
Secured Debt [Member] | Secured Series 1993A Bonds [Member]
|
|
| Debt Instrument, Maturity Date | Dec. 31, 2023 |
| Interest rates (in hundredths) | 2.95% |
|
EIRR Bonds Remarketed Same Series [Member] | Corporate Debt Securities [Member] | Remarketed EIRR Bonds Series 2007B due 2035 [Member]
|
|
| EIRR Bonds Remarketed | $ 73.2 |
| Debt Instrument, Maturity Date | Dec. 31, 2035 |
|
EIRR Bonds Remarketed Same Series [Member] | Secured Debt [Member] | Secured 1992 Series EIRR Bonds [Member]
|
|
| EIRR Bonds Remarketed | 31.0 |
| Debt Instrument, Maturity Date | Dec. 31, 2017 |
| Interest rates (in hundredths) | 1.25% |
|
EIRR Bonds Remarketed Same Series [Member] | Secured Debt [Member] | Secured Series 1993B EIRR Bonds Member
|
|
| EIRR Bonds Remarketed No Longer Held | 39.5 |
| Debt Instrument, Maturity Date | Dec. 31, 2023 |
| Interest rates (in hundredths) | 2.95% |
|
EIRR Bonds Remarketed Same Series [Member] | Secured Debt [Member] | Secured Series 1993A Bonds [Member]
|
|
| EIRR Bonds Remarketed | 40.0 |
|
EIRR Bonds Remarketed Old Series [Member] | Corporate Debt Securities [Member] | General Mortgage bonds EIRR Series 2007A-1 due 2035 [Member]
|
|
| EIRR Bonds Remarketed No Longer Held | 10.0 |
|
EIRR Bonds Remarketed Old Series [Member] | Corporate Debt Securities [Member] | General Mortgage bonds EIRR series 2007A-2 due 2035 [Member]
|
|
| EIRR Bonds Remarketed No Longer Held | 63.3 |
|
EIRR Bonds Remarketed New Series [Member] | Corporate Debt Securities [Member] | Remarketed EIRR Bonds Series 2007A due 2035 [Member]
|
|
| EIRR Bonds Remarketed No Longer Held | 73.3 |
| Debt Instrument, Maturity Date | Dec. 31, 2035 |
|
Debt retired in connection with EIRR bonds remarketing [Member] | Secured Debt [Member] | Mortgage Bonds Series 2007 EIRR Issuer due 2035 [Member]
|
|
| Extinguishment of Debt, Amount | $ 146.5 |
| X | ||||||||||
|
- Definition
EIRR bonds remarketed by KCP&L. No definition available.
|
| X | ||||||||||
|
- Definition
EIRR bonds remarketed and no longer held by KCP&L. No definition available.
|
| X | ||||||||||
|
- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Gross amount of debt extinguished. No definition available.
|
|
Long-Term Debt Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2013
|
|
| Subsequent Event [Line Items] | |
| Subsequent Event Amount | $ 11.8 |
| Subsequent Event Description | In July 2013, the IRS provided guidance to the Company regarding the audit of certain income tax accounting methods for the capitalization of assets. Based on this new guidance, the Company expects to reduce unrecognized tax benefits for these income tax accounting methods by $11.8 million for Great Plains Energy and KCP&L in the third quarter of 2013. This $11.8 million reduction in unrecognized tax benefits will be offset by an increase to deferred income tax liabilities since a significant portion of the unrecognized tax benefits were related to temporary tax differences. |
|
Kansas City Power and Light Company [Member] | Subsequent Event [Member] | EIRR Bonds Remarketed Same Series [Member] | Corporate Debt Securities [Member] | EIRR bonds 4.90 percent Series 2008 [Member]
|
|
| Subsequent Event [Line Items] | |
| Subsequent Event Amount | $ 23.4 |
| Subsequent Event Date | Jul. 01, 2013 |
| Subsequent Event Description | In July 2013, KCP&L remarketed its unsecured Series 2008 EIRR bonds maturing in 2038 totaling $23.4 million at a fixed rate of 2.875% through July 1, 2018. |
| X | ||||||||||
|
- Definition
Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Commitments and Contingencies Environmental Matters (Details) (USD $)
|
Jun. 30, 2013
MW
T
|
Dec. 31, 2012
|
|---|---|---|
| Estimates Of Environmental Financial Impact And Related Issues [Line Items] | ||
| Current estimate of capital expenditures final regulations | $ 700,000,000 | |
| Current estimate of capital expenditures for proposed regulations, minimum | 600,000,000 | |
| Current estimate of capital expenditures for proposed regulations, maximum | 800,000,000 | |
| Clean Air Interstate Rule (CAIR) and Cross-State Air Pollution Rule (CSAPR) [Abstract] | ||
| Number Of States Required To Reduce Emissions Under Cair | 28 | |
| Mercury and Air Toxics Standards Rule [Abstract] | ||
| Capacity of electric steam generating units that fall under MACT standards (in megawatts) | 25 | |
| SO2 National Ambient Air Quality Standard (NAAQS) [Abstract] | ||
| Primary one-hour sulfur dioxide standard, as revised June 2010 (in parts per million) | 0.075 | |
| Primary twenty-four hour sulfur dioxide standard, prior to June 2010 (in parts per million) | 0.140 | |
| Primary one-year sulfur dioxide standard, prior to June 2010 (in parts per million) | 0.030 | |
| Climate Change [Abstract] | ||
| CO2 produced per year (in tons) | 25,000,000 | |
| Remediation [Abstract] | ||
| Amount accrued for future investigation remediation and of GMO retained liabilities | 2,000,000 | 2,000,000 |
|
LaCygne Station Environmental Retrofits [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Predetermination request for environmental equipment required at LaCygne Station to comply with BART | 1,230,000,000 | |
|
Kansas City Power and Light Company [Member]
|
||
| Estimates Of Environmental Financial Impact And Related Issues [Line Items] | ||
| Current estimate of capital expenditures final regulations | 700,000,000 | |
| Cash capital expenditures incurred for La Cygne environmental project | 311,000,000 | |
| Current estimate of capital expenditures for proposed regulations, minimum | 350,000,000 | |
| Current estimate of capital expenditures for proposed regulations, maximum | 450,000,000 | |
| Climate Change [Abstract] | ||
| CO2 produced per year (in tons) | 19,000,000 | |
| Minimum required renewable energy generation capacity percentage in Kansas by 2011 | 10.00% | |
| Minimum required renewable energy generation capacity percentage in Kansas by 2016 | 15.00% | |
| Minimum required renewable energy generation capacity percentage in Kansas by 2020 | 20.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2011 | 2.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2014 | 5.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2018 | 10.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2021 | 15.00% | |
| Estimated electricity required to come from solar resources (in megawatts) | 2 | |
| Remediation [Abstract] | ||
| Accrued environmental remediation expenses | 300,000 | 300,000 |
|
Kansas City Power and Light Company [Member] | LaCygne Station [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Entity's ownership percentage in facility (in hundredths) | 50.00% | |
|
Kansas City Power and Light Company [Member] | LaCygne Station Environmental Retrofits [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| KCPL share of predetermination request for environmental equipment required at LaCygne Station to comply with BART | 615,000,000 | |
|
KCPL Greater Missouri Operations [Member]
|
||
| Climate Change [Abstract] | ||
| Minimum required renewable energy generation capacity percentage in Missouri by 2011 | 2.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2014 | 5.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2018 | 10.00% | |
| Minimum required renewable energy generation capacity percentage in Missouri by 2021 | 15.00% | |
| Estimated electricity required to come from solar resources (in megawatts) | 2 | |
| Remediation [Abstract] | ||
| Estimated amount of insurance proceeds available to cover qualified remediation expenses | 2,600,000 | |
|
KCPL Greater Missouri Operations [Member] | Jeffrey Units Nos 1 and 2 [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Entity's ownership percentage in facility (in hundredths) | 8.00% | |
|
Westar Energy Inc [Member] | Jeffrey Units Nos 1 and 2 [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Entity's ownership percentage in facility (in hundredths) | 92.00% | |
| New Source Review [Abstract] | ||
| Estimated cost to install a selective catalytic reduction system at Jeffrey Energy Center pursuant to a settlement agreement | $ 240,000,000 |
| X | ||||||||||
|
- Definition
Total costs accrued as of the balance sheet date for the future investigation and remediation of certain additional GMO identified MGP sites, PCB sites and retained liabilities. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
New MACT rules will apply to all new or existing coal-fired electric generating units with a capacity equal to or greater than this amount. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of cash capital expenditures that have been incurred since commencement of the La Cygne environmental project and are included in the Company's total estimate of capital expenditures to comply with environmental regulations. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Represents the estimated cost to install a selective catalytic reduction system at Jeffrey Energy Center pursuant to a settlement agreement related to Westar Energy, Incorporated's alleged Clean Air Act violations. No definition available.
|
| X | ||||||||||
|
- Definition
Great Plains Energy's and KCPL's current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) to comply with current final environmental regulations. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the maximum current estimate of capital expenditures for compliance with proposed or final environmental regulations where the timing is uncertain under the Clean Air Act and Clean Water Act. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the minimum current estimate of capital expenditures for compliance with proposed or final environmental regulations where the timing is uncertain under the Clean Air Act and Clean Water Act. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the estimated amount of insurance proceeds available, less an annual deductible, to GMO cover qualified MGP remediation expenses. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the company-specific estimated megawatts of electricity required to be provided by KCPL and GMO to their Missouri retail customers from solar resources by 2011, pursuant to a law passed in 2008. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the estimated number of tons of CO2 produced each year based on current generation capacity. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
KCPL's share of the amount of the predetermination request in Kansas for environmental equipment required at LaCygne Station to comply with BART. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Represents the renewable energy generation capacity based on a three-year average of Kansas peak retail demand required to be in place by 2020. This law was passed in 2009 and applies to all Kansas public electric utilities, including KCPL. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the renewable energy generation capacity based on a three-year average of Kansas peak retail demand required to be in place by 2016. This law was passed in 2009 and applies to all Kansas public electric utilities, including KCPL. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the renewable energy generation capacity based on a three-year average of Kansas peak retail demand required to be in place by 2011. This law was passed in 2009 and applies to all Kansas public electric utilities, including KCPL. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the percentage of electricity provided by Missouri investor-owned utilities (including KCPL and GMO) to their Missouri retail customers required to come from renewable resources by 2014, pursuant to a law passed in 2008. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the percentage of electricity provided by Missouri investor-owned utilities (including KCPL and GMO) to their Missouri retail customers required to come from renewable resources by 2018, pursuant to a law passed in 2008. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the percentage of electricity provided by Missouri investor-owned utilities (including KCPL and GMO) to their Missouri retail customers required to come from renewable resources by 2021, pursuant to a law passed in 2008. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the percentage of electricity provided by Missouri investor-owned utilities (including KCPL and GMO) to their Missouri retail customers required to come from renewable resources by 2011, pursuant to a law passed in 2008. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Represents the number of states required to reduce emissions of SO2 and NOX under the CAIR, including Missouri. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of the predetermination request in Kansas for environmental equipment required at LaCygne Station to comply with BART. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Represents the primary one-hour sulfur dioxide standard as revised by the Environmental Protection Agency in June 2010 to replace the exisiting 24-hour and one-year standards. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the primary twenty-four hour sulfur dioxide standard revoked by the Environmental Protection Agency in June 2010. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the primary one-year sulfur dioxide standard revoked by the Environmental Protection Agency in June 2010. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The proportionate share of interest (percent) in a jointly owned utility plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Legal Proceedings Loss Contingencies (Details) (Pending Litigation [Member], KCPL Greater Missouri Operations [Member], USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
|---|---|
|
Pending Litigation [Member] | KCPL Greater Missouri Operations [Member]
|
|
| Loss Contingencies [Line Items] | |
| Approximate amount of refunds received as a net purchaser of power through settlements with sellers of power | $ 8 |
| Estimated additional refunds entitled to receive | $ 12 |
| X | ||||||||||
|
- Definition
The approximate amount of refunds received by MPS Merchant Services, Inc., a wholly owned subsidiary of KCP and L Greater Missouri Operations Company, for net purchases of power in the California energy markets between October 2, 2000 through June 20, 2001. No definition available.
|
| X | ||||||||||
|
- Definition
Estimated additional refunds entitled to receive. No definition available.
|
| X | ||||||||||
|
- Details
|
|
Related Party Transactions and Relationships (Details) (Kansas City Power and Light Company [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Dec. 31, 2012
|
|
|
KCPL Greater Missouri Operations [Member]
|
|||||
| Related Party Transaction [Line Items] | |||||
| Receivable from Related Party | $ 59.2 | $ 59.2 | $ 26.2 | ||
| KCPL employees manage GMO's business and operate its facilities at cost | 24.4 | 26.7 | 49.6 | 52.9 | |
| KCPL net wholesale sales to GMO | 4.6 | 7.4 | 10.0 | 12.8 | |
| Money pool receivable | 36.3 | 36.3 | |||
|
Great Plains Energy [Member]
|
|||||
| Related Party Transaction [Line Items] | |||||
| Receivable from Related Party | 16.3 | 16.3 | 13.8 | ||
| Money pool payable | $ 3.8 | ||||
| X | ||||||||||
|
- Definition
Carrying amount as of the balance sheet date of obligations due to participant under Great Plains Energy's money pool lending arrangement. No definition available.
|
| X | ||||||||||
|
- Definition
Amount receivable under the Great Plains Energy money pool, an internal financing arrangement. No definition available.
|
| X | ||||||||||
|
- Definition
The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of transactions with related party during the financial reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. No definition available.
|
|
Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
|
Futures contracts [Member] | Cash Flow Hedging [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | $ 0 | $ 1.0 |
| Fair Value | 0 | (0.2) |
|
Futures contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 11.4 | 17.9 |
| Fair Value | (0.9) | (2.8) |
|
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 57.3 | 65.5 |
| Fair Value | 6.0 | 6.5 |
|
Option contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 3.4 | 0 |
| Fair Value | 0.3 | 0 |
|
Kansas City Power and Light Company [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Percentage Of Projected Natural Gas Usage Hedged Year One | 0.00% | |
|
Kansas City Power and Light Company [Member] | Futures contracts [Member] | Cash Flow Hedging [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 0 | 1.0 |
| Fair Value | 0 | (0.2) |
|
Kansas City Power and Light Company [Member] | Futures contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 1.0 | 0 |
| Fair Value | $ 0.3 | $ 0 |
|
KCPL Greater Missouri Operations [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Percentage of expected on peak natural gas and natural gas equivalent purchased power price exposure hedged year one | 38.00% | |
| Percentage of expected on peak natural gas and natural gas equivalent purchased power price exposure hedged year two | 23.00% | |
| Percentage of expected on peak natural gas and natural gas equivalent purchased power price exposure hedged year three | 3.00% |
| X | ||||||||||
|
- Definition
Percentage of expected on-peak natural gas and natural gas equivalent purchased power price exposure that is hedged for the year following the balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of projected natural gas usage hedged for the third year following the balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of expected on-peak natural gas and natural gas equivalent purchased power price exposure that is hedged for the second year following the balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of projected natural gas usage hedged for the year following the balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were not offset against collateral under a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments Fair Value (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
|
Derivative [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative asset, fair value, amount not offset against collateral | $ 6.5 | |
| Derivative liability, fair value, amount not offset against collateral | 3.0 | |
|
Cash Flow Hedging [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | (29.3) | (35.4) |
|
Cash Flow Hedging [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | (23.0) | (25.8) |
|
Cash Flow Hedging [Member] | Current assets [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | 10.4 | 10.6 |
|
Cash Flow Hedging [Member] | Current assets [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | 10.4 | 10.6 |
|
Cash Flow Hedging [Member] | Current liabilities [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | (58.3) | (68.4) |
|
Cash Flow Hedging [Member] | Current liabilities [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | (48.1) | (52.8) |
|
Cash Flow Hedging [Member] | Noncurrent liabilities [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | 0 | (0.1) |
|
Cash Flow Hedging [Member] | Noncurrent liabilities [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | 0 | (0.1) |
|
Cash Flow Hedging [Member] | Deferred income taxes [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | 18.6 | 22.5 |
|
Cash Flow Hedging [Member] | Deferred income taxes [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Recorded amounts included in accumulated other comprehensive income | 14.7 | 16.5 |
|
Commodity Contract [Member] | Designated as Hedging Instrument [Member] | Derivative [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative asset, fair value, amount not offset against collateral | 0 | |
| Derivative liability, fair value, amount not offset against collateral | 0.2 | |
|
Commodity Contract [Member] | Designated as Hedging Instrument [Member] | Derivative [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative asset, fair value, amount not offset against collateral | 0 | |
| Derivative liability, fair value, amount not offset against collateral | 0.2 | |
|
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Derivative [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative asset, fair value, amount not offset against collateral | 6.6 | 6.5 |
| Derivative liability, fair value, amount not offset against collateral | 1.2 | 2.8 |
|
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Derivative [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative asset, fair value, amount not offset against collateral | 0.3 | |
| Derivative liability, fair value, amount not offset against collateral | $ 0 |
| X | ||||||||||
|
- Definition
The value recorded in accumulated other comprehensive income. No definition available.
|
| X | ||||||||||
|
- Definition
The amount as of the balance sheet date of the fair value of derivative assets that in accordance with the entity's accounting policy was not offset against an obligation to return cash collateral under a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount as of the balance sheet date of the fair value of derivative liabilities that in accordance with the entity's accounting policy was not offset against the right to reclaim cash collateral under a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments by Hedging Relationship by Income Statement Location (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
|
Cash Flow Hedging [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 0 | $ 0.1 | $ 0 | $ (0.1) |
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (2.9) | (3.1) | (6.1) | (6.2) |
|
Cash Flow Hedging [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 | 0.1 | 0 | (0.1) |
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (1.3) | (1.3) | (2.8) | (2.7) |
|
Cash Flow Hedging [Member] | Interest charges [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (4.7) | (5.0) | (9.7) | (10.1) |
|
Cash Flow Hedging [Member] | Interest charges [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (2.2) | (2.2) | (4.4) | (4.4) |
|
Cash Flow Hedging [Member] | Fuel Costs [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 0 | (0.2) | 0 | |
|
Cash Flow Hedging [Member] | Fuel Costs [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 0 | (0.2) | 0 | |
|
Cash Flow Hedging [Member] | Income tax benefit (expense) [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 1.8 | 1.9 | 3.8 | 3.9 |
|
Cash Flow Hedging [Member] | Income tax benefit (expense) [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 0.9 | 0.9 | 1.8 | 1.7 |
|
Regulatory Account [Member] | Fuel Costs [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain(Loss) Reclassified from Regulatory Account into Income (Effective Portion) | (0.2) | (2.0) | (1.2) | (2.7) |
|
Interest Rate Contract [Member] | Cash Flow Hedging [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 | 0 | 0 | 0 |
|
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 | 0 | 0 | 0 |
|
Commodity Contract [Member] | Cash Flow Hedging [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0.1 | 0 | (0.2) | |
|
Commodity Contract [Member] | Cash Flow Hedging [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0.1 | 0 | (0.2) | |
|
Commodity Contract [Member] | Regulatory Account [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized on Regulatory Account on Derivatives (Effective Portion) | (0.9) | 0.3 | 0.9 | (2.7) |
|
Income tax benefit (expense) [Member] | Cash Flow Hedging [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 | 0 | 0 | 0.1 |
|
Income tax benefit (expense) [Member] | Cash Flow Hedging [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 0 | $ 0 | $ 0 | $ 0.1 |
| X | ||||||||||
|
- Definition
The income statement location of the effective portion of net gain or loss reclassified from regulatory account into income on derivative instruments designated and qualifying as hedging instruments. No definition available.
|
| X | ||||||||||
|
- Definition
The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in regulatory account during the current period. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Derivative Instruments Gain and Losses (Details) (Not Designated as Hedging Instrument [Member], Commodity [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |
|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2012
|
Jun. 30, 2013
Kansas City Power and Light Company [Member]
|
Jun. 30, 2013
Kansas City Power and Light Company [Member]
|
|
| Trading Activity, Gains and Losses, Net [Line Items] | |||||
| Gains (losses) reflected in the income statement for changes in fair value of commodity contracts not designated as hedging | $ 1.0 | $ (0.3) | $ (1.1) | $ 1.6 | $ 0.6 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The net gain (loss) on trading activities (including both derivative and nonderivative instruments) recognized in the statement of financial performance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Derivative Instruments Cash Flow Hedge (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2013
|
|
| Derivative [Line Items] | |
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ (19.3) |
|
Kansas City Power and Light Company [Member]
|
|
| Derivative [Line Items] | |
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ (8.7) |
| X | ||||||||||
|
- Definition
The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments Derivative Instruments Offsetting (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Derivative Assets [Abstract] | ||
| Derivative Asset, Fair Value, Gross Asset | $ 6.6 | $ 6.5 |
| Derivative Asset, Fair Value, Gross Amounts Offset | (0.1) | 0 |
| Derivative Assets, Fair Value, Net | 6.5 | 6.5 |
| Derivative, Collateral, Obligation to Return Securities | 0 | 0 |
| Derivative, Collateral, Obligation to Return Cash | 0 | 0 |
| Derivative Assets Net of Gross Amounts Offset And Not Offset | 6.5 | 6.5 |
| Derivative Liabilities [Abstract] | ||
| Derivative Liability, Fair Value, Gross Liability | 1.2 | 3.0 |
| Derivative Liability, Fair Value, Gross Amounts Offset | (1.2) | (3.0) |
| Derivative Liabilities, Fair Value, Net | 0 | 0 |
| Derivative, Collateral, Right to Reclaim Securities | 0 | 0 |
| Derivative, Collateral, Right to Reclaim Cash | 0 | 0 |
| Derivative Liability, Fair Value, Net of Gross Amounts Offset And Not Offset | 0 | 0 |
|
Kansas City Power and Light Company [Member]
|
||
| Derivative Assets [Abstract] | ||
| Derivative Asset, Fair Value, Gross Asset | 0.3 | |
| Derivative Asset, Fair Value, Gross Amounts Offset | 0 | |
| Derivative Assets, Fair Value, Net | 0.3 | |
| Derivative, Collateral, Obligation to Return Securities | 0 | |
| Derivative, Collateral, Obligation to Return Cash | 0 | |
| Derivative Assets Net of Gross Amounts Offset And Not Offset | 0.3 | |
| Derivative Liabilities [Abstract] | ||
| Derivative Liability, Fair Value, Gross Liability | 0.2 | |
| Derivative Liability, Fair Value, Gross Amounts Offset | (0.2) | |
| Derivative Liabilities, Fair Value, Net | 0 | |
| Derivative, Collateral, Right to Reclaim Securities | 0 | |
| Derivative, Collateral, Right to Reclaim Cash | 0 | |
| Derivative Liability, Fair Value, Net of Gross Amounts Offset And Not Offset | $ 0 |
| X | ||||||||||
|
- Definition
Represents the difference between derivative contracts in an asset or liability position presented on a net basis by counterparty on the consolidated balance sheets where a master netting agreement exists between the Company and the counterparty. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the fair value of derivative assets, after netting of gross amounts offset and not offset in the statement of financial position. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the difference between derivative contracts in an asset or liability position presented on a net basis by counterparty on the consolidated balance sheets where a master netting agreement exists between the Company and the counterparty. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the fair value of derivative liabilities, after netting of gross amounts offset and not offset in the statement of financial position. No definition available.
|
| X | ||||||||||
|
- Definition
Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the right to reclaim cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | $ 6.5 | $ 6.5 | ||||||||||
|
Kansas City Power and Light Company [Member]
|
||||||||||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||
| Cash and cash equivalents from nuclear decommissioning trust excluded from fair value disclosure | 4.7 | 2.9 | ||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.3 | |||||||||||
|
Other Great Plains [Member]
|
||||||||||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||
| Cash and cash equivalents from SERP rabbi trust excluded from fair value disclosure | 0.1 | 0.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
||||||||||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||
| Cash collateral posted with third parties as part of netting agreements | 1.1 | 3.0 | ||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 6.5 | [1] | 6.5 | [1] | ||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| Total nuclear decommissioning trust | 160.0 | [2] | 151.8 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total SERP rabbi trust | 19.8 | [3] | 20.3 | [3] | ||||||||
| Total assets | 186.3 | 178.6 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0 | [1] | ||||||||
| Total liabilities | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Netting [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | (0.1) | [1],[4] | 0 | [1],[4] | ||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| Total nuclear decommissioning trust | 0 | [2],[4] | 0 | [2],[4] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total SERP rabbi trust | 0 | [3],[4] | 0 | [3],[4] | ||||||||
| Total assets | (0.1) | [4] | 0 | [4] | ||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | (1.2) | [1],[4] | (3.0) | [1],[4] | ||||||||
| Total liabilities | (1.2) | [4] | (3.0) | [4] | ||||||||
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.3 | [1] | 0 | [1] | ||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| Total nuclear decommissioning trust | 129.0 | [2] | 118.6 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total SERP rabbi trust | 0.1 | [3] | 0.1 | [3] | ||||||||
| Total assets | 129.4 | 118.7 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 1.2 | [1] | 3.0 | [1] | ||||||||
| Total liabilities | 1.2 | 3.0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 4.4 | [1] | 4.2 | [1] | ||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| Total nuclear decommissioning trust | 31.0 | [2] | 33.2 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total SERP rabbi trust | 19.7 | [3] | 20.2 | [3] | ||||||||
| Total assets | 55.1 | 57.6 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0 | [1] | ||||||||
| Total liabilities | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 1.9 | [1] | 2.3 | [1] | ||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| Total nuclear decommissioning trust | 0 | [2] | 0 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total SERP rabbi trust | 0 | [3] | 0 | [3] | ||||||||
| Total assets | 1.9 | 2.3 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0 | [1] | ||||||||
| Total liabilities | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.3 | [1] | ||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Equity securities related to nuclear decommissioning trust | 109.9 | 100.1 | ||||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| U.S. Treasury | 19.1 | 18.5 | ||||||||||
| U.S. Agency | 2.4 | 2.8 | ||||||||||
| State and local obligations | 3.1 | 3.3 | ||||||||||
| Corporate bonds | 24.5 | 26.8 | ||||||||||
| Other assets related to nuclear decommissioning trust | 1.0 | 0.3 | ||||||||||
| Total nuclear decommissioning trust | 160.0 | [2] | 151.8 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 160.3 | 151.8 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | ||||||||||
| Total liabilities | 0 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Netting [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0 | [1],[4] | ||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Equity securities related to nuclear decommissioning trust | 0 | [4] | 0 | [4] | ||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| U.S. Treasury | 0 | [4] | 0 | [4] | ||||||||
| U.S. Agency | 0 | [4] | 0 | [4] | ||||||||
| State and local obligations | 0 | [4] | 0 | [4] | ||||||||
| Corporate bonds | 0 | [4] | 0 | [4] | ||||||||
| Other assets related to nuclear decommissioning trust | 0 | [4] | 0 | [4] | ||||||||
| Total nuclear decommissioning trust | 0 | [2],[4] | 0 | [2],[4] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 0 | [4] | 0 | [4] | ||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | (0.2) | [1],[4] | ||||||||||
| Total liabilities | (0.2) | [4] | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.3 | [1] | ||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Equity securities related to nuclear decommissioning trust | 109.9 | 100.1 | ||||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| U.S. Treasury | 19.1 | 18.5 | ||||||||||
| U.S. Agency | 0 | 0 | ||||||||||
| State and local obligations | 0 | 0 | ||||||||||
| Corporate bonds | 0 | 0 | ||||||||||
| Other assets related to nuclear decommissioning trust | 0 | 0 | ||||||||||
| Total nuclear decommissioning trust | 129.0 | [2] | 118.6 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 129.3 | 118.6 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.2 | [1] | ||||||||||
| Total liabilities | 0.2 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0 | [1] | ||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Equity securities related to nuclear decommissioning trust | 0 | 0 | ||||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| U.S. Treasury | 0 | 0 | ||||||||||
| U.S. Agency | 2.4 | 2.8 | ||||||||||
| State and local obligations | 3.1 | 3.3 | ||||||||||
| Corporate bonds | 24.5 | 26.8 | ||||||||||
| Other assets related to nuclear decommissioning trust | 1.0 | 0.3 | ||||||||||
| Total nuclear decommissioning trust | 31.0 | [2] | 33.2 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 31.0 | 33.2 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | ||||||||||
| Total liabilities | 0 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0 | [1] | ||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Equity securities related to nuclear decommissioning trust | 0 | 0 | ||||||||||
| Debt securities related to nuclear decommissioning trust [Abstract] | ||||||||||||
| U.S. Treasury | 0 | 0 | ||||||||||
| U.S. Agency | 0 | 0 | ||||||||||
| State and local obligations | 0 | 0 | ||||||||||
| Corporate bonds | 0 | 0 | ||||||||||
| Other assets related to nuclear decommissioning trust | 0 | 0 | ||||||||||
| Total nuclear decommissioning trust | 0 | [2] | 0 | [2] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 0 | 0 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | ||||||||||
| Total liabilities | 0 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 6.2 | [1] | 6.5 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Equity securities related to SERP rabbi trust | 0.1 | 0.1 | ||||||||||
| Fixed income funds related to SERP rabbi trust | 19.7 | 20.2 | ||||||||||
| Total SERP rabbi trust | 19.8 | [3] | 20.3 | [3] | ||||||||
| Total assets | 26.0 | 26.8 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0 | [1] | ||||||||
| Total liabilities | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Netting [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | (0.1) | [1],[4] | 0 | [1],[4] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Equity securities related to SERP rabbi trust | 0 | [4] | 0 | [4] | ||||||||
| Fixed income funds related to SERP rabbi trust | 0 | [4] | 0 | [4] | ||||||||
| Total SERP rabbi trust | 0 | [3],[4] | 0 | [3],[4] | ||||||||
| Total assets | (0.1) | [4] | 0 | [4] | ||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | (1.2) | [1],[4] | (2.8) | [1],[4] | ||||||||
| Total liabilities | (1.2) | [4] | (2.8) | [4] | ||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0 | [1] | 0 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Equity securities related to SERP rabbi trust | 0.1 | 0.1 | ||||||||||
| Fixed income funds related to SERP rabbi trust | 0 | 0 | ||||||||||
| Total SERP rabbi trust | 0.1 | [3] | 0.1 | [3] | ||||||||
| Total assets | 0.1 | 0.1 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 1.2 | [1] | 2.8 | [1] | ||||||||
| Total liabilities | 1.2 | 2.8 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 4.4 | [1] | 4.2 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Equity securities related to SERP rabbi trust | 0 | 0 | ||||||||||
| Fixed income funds related to SERP rabbi trust | 19.7 | 20.2 | ||||||||||
| Total SERP rabbi trust | 19.7 | [3] | 20.2 | [3] | ||||||||
| Total assets | 24.1 | 24.4 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0 | [1] | ||||||||
| Total liabilities | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 1.9 | [1] | 2.3 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Equity securities related to SERP rabbi trust | 0 | 0 | ||||||||||
| Fixed income funds related to SERP rabbi trust | 0 | 0 | ||||||||||
| Total SERP rabbi trust | 0 | [3] | 0 | [3] | ||||||||
| Total assets | 1.9 | 2.3 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0 | [1] | ||||||||
| Total liabilities | $ 0 | $ 0 | ||||||||||
|
||||||||||||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents the cash and cash equivalents that are part of the nuclear decommissioning trust that are not subject to the fair value requirements. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the cash and cash equivalents that are part of the SERP rabbi trust that are not subject to the fair value requirements. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to corporate bonds debt securites that are part of the nuclear decommissioning trust. No definition available.
|
| X | ||||||||||
|
- Definition
Fair value disclosure of equity securities included in the decommissioning trust assets. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to equity securites that are part of the SERP rabbi trust. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to fixed income funds that are part of the SERP rabbi trust. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to other assets that are part of the nuclear decommissioning trust. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to state and local obligations debt securites that are part of the nuclear decommissioning trust. No definition available.
|
| X | ||||||||||
|
- Definition
The total fair value of assets measured on recurring basis. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to the nuclear decommissioning trust. No definition available.
|
| X | ||||||||||
|
- Definition
Total assets measured at fair value on a recurring basis included in the SERP rabbi trust. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to U.S. agency debt securites that are part of the nuclear decommissioning trust. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the fair value disclosure of assets measured on a recurring basis that are related to U.S. treasury debt securites that are part of the nuclear decommissioning trust. No definition available.
|
| X | ||||||||||
|
- Definition
The total fair value of liabilities measured on recurring basis. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
|
Fair Value Measurements Level 3 (Details) (Derivative Financial Instruments, Assets [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
|
Derivative Financial Instruments, Assets [Member]
|
||||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Balance at beginning of period | $ 2.4 | $ 2.4 | $ 2.3 | $ 3.1 |
| Total realized/unrealized gains or (losses) included in non-operating income | 1.9 | 0.9 | 4.3 | 1.1 |
| Settlements | (2.4) | (1.1) | (4.7) | (2.0) |
| Balance at end of period | 1.9 | 2.2 | 1.9 | 2.2 |
| Total unrealized gains and (losses) included in non-operating income relating to assets and liabilities still on the consolidated balance sheet at period end | $ (0.3) | $ (0.1) | $ (0.1) | $ (0.7) |
| X | ||||||||||
|
- Definition
This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||
| Beginning balance | $ (38.4) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 6.3 | [1] | ||||||
| Net current period other comprehensive income | 3.1 | 3.2 | 6.3 | [1] | 6.2 | |||
| Ending balance | (32.1) | [1] | (32.1) | [1] | ||||
|
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
|
||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||
| Beginning balance | (35.4) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 6.1 | [1] | ||||||
| Net current period other comprehensive income | 6.1 | [1] | ||||||
| Ending balance | (29.3) | [1] | (29.3) | [1] | ||||
|
Accumulated Defined Benefit Plans Adjustment [Member]
|
||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||
| Beginning balance | (3.0) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 0.2 | [1] | ||||||
| Net current period other comprehensive income | 0.2 | [1] | ||||||
| Ending balance | (2.8) | [1] | (2.8) | [1] | ||||
|
Kansas City Power and Light Company [Member]
|
||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||
| Beginning balance | (25.8) | |||||||
| Net current period other comprehensive income | 1.3 | 1.4 | 2.8 | 2.6 | ||||
| Ending balance | (23.0) | (23.0) | ||||||
|
Kansas City Power and Light Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
|
||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||
| Beginning balance | (25.8) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 2.8 | [1] | ||||||
| Net current period other comprehensive income | 2.8 | [1] | ||||||
| Ending balance | $ (23.0) | [1] | $ (23.0) | [1] | ||||
|
||||||||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss). No definition available.
|
| X | ||||||||||
|
- Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Accumulated Other Comprehensive Income (Loss) Reclassification (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest charges | $ (49.4) | $ (55.8) | $ (99.1) | $ (122.7) |
| Fuel | (121.2) | (138.1) | (253.4) | (257.4) |
| Utility operating and maintenance expenses | (166.4) | (164.1) | (321.6) | (327.2) |
| Income before income tax (expense) benefit and income (loss) from equity investments | 96.4 | 90.0 | 134.0 | 71.2 |
| Income tax (expense) benefit | (32.7) | (31.8) | (44.2) | (22.3) |
| Net income (loss) | 63.6 | 58.1 | 89.6 | 48.8 |
|
Reclassification out of Accumulated Other Comprehensive Income [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Net income (loss) | (3.1) | (6.3) | ||
|
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before income tax (expense) benefit and income (loss) from equity investments | (4.7) | (9.9) | ||
| Income tax (expense) benefit | 1.8 | 3.8 | ||
| Net income (loss) | (2.9) | (6.1) | ||
|
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest charges | (4.7) | (9.7) | ||
|
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Commodity Contract [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Fuel | (0.2) | |||
|
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Utility operating and maintenance expenses | (0.3) | (0.3) | ||
| Income before income tax (expense) benefit and income (loss) from equity investments | (0.3) | (0.3) | ||
| Income tax (expense) benefit | 0.1 | 0.1 | ||
| Net income (loss) | (0.2) | (0.2) | ||
|
Kansas City Power and Light Company [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest charges | (31.5) | (31.3) | (63.5) | (63.7) |
| Fuel | (86.0) | (98.7) | (180.5) | (183.3) |
| Utility operating and maintenance expenses | (116.7) | (115.9) | (224.9) | (233.8) |
| Income before income tax (expense) benefit and income (loss) from equity investments | 64.5 | 66.7 | 86.1 | 65.7 |
| Income tax (expense) benefit | (20.3) | (23.0) | (25.7) | (19.7) |
| Net income (loss) | 44.2 | 43.7 | 60.4 | 46.0 |
|
Kansas City Power and Light Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before income tax (expense) benefit and income (loss) from equity investments | (2.2) | (4.6) | ||
| Income tax (expense) benefit | 0.9 | 1.8 | ||
| Net income (loss) | (1.3) | (2.8) | ||
|
Kansas City Power and Light Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest charges | (2.2) | (4.4) | ||
|
Kansas City Power and Light Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Commodity Contract [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Fuel | $ (0.2) | |||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of fuel used charged against earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Discloses the amount of operating expense for the period for routine plant maintenance, repairs and operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Current income taxes | ||||
| Federal | $ 0 | $ (3.3) | $ 0 | $ (3.3) |
| State | 0.2 | 0.4 | 0.1 | 0.3 |
| Current Income Tax Expense (Benefit), Total | 0.2 | (2.9) | 0.1 | (3.0) |
| Deferred income taxes | ||||
| Federal | 27.6 | 30.8 | 37.5 | 22.5 |
| State | 5.7 | 5.1 | 8.0 | 4.3 |
| Deferred Income Tax Expense (Benefit), Total | 33.3 | 35.9 | 45.5 | 26.8 |
| Noncurrent income taxes | ||||
| Federal | 0 | (0.2) | 0 | (0.2) |
| State | (0.2) | 0 | (0.2) | 0 |
| Foreign | (0.2) | (0.4) | (0.3) | (0.1) |
| Noncurrent Income Tax Expense (Benefit), Total | (0.4) | (0.6) | (0.5) | (0.3) |
| Investment tax credit | ||||
| Amortization | (0.4) | (0.6) | (0.9) | (1.2) |
| Total income tax expense | 32.7 | 31.8 | 44.2 | 22.3 |
| Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] | ||||
| Federal statutory income tax (in hundredths) | 35.00% | 35.00% | 35.00% | 35.00% |
| Differences between book and tax depreciation not normalized (in hundredths) | (0.30%) | 1.20% | 0.20% | 3.00% |
| Amortization of investments tax credits (in hundredths) | (0.40%) | (0.70%) | (0.60%) | (1.80%) |
| Federal income tax credits (in hundredths) | (3.80%) | (3.60%) | (5.00%) | (8.60%) |
| State income taxes (in hundredths) | 3.80% | 3.90% | 3.90% | 4.10% |
| Changes in uncertain tax positions, net (in hundredths) | (0.30%) | (0.40%) | (0.40%) | (0.10%) |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance | 0.00% | 0.10% | 0.00% | 0.10% |
| Effective Income Tax Rate Reconciliation, Other Adjustments | (0.10%) | 0.00% | (0.10%) | (0.40%) |
| Effective Income Tax Rate, Continuing Operations, Total | 33.90% | 35.50% | 33.00% | 31.30% |
|
Kansas City Power and Light Company [Member]
|
||||
| Current income taxes | ||||
| Federal | (0.3) | 0.1 | (0.6) | 0.2 |
| State | (0.1) | 0.1 | (0.1) | 0.1 |
| Current Income Tax Expense (Benefit), Total | (0.4) | 0.2 | (0.7) | 0.3 |
| Deferred income taxes | ||||
| Federal | 16.6 | 19.4 | 20.6 | 16.1 |
| State | 3.7 | 4.2 | 5.0 | 4.1 |
| Deferred Income Tax Expense (Benefit), Total | 20.3 | 23.6 | 25.6 | 20.2 |
| Noncurrent income taxes | ||||
| Federal | 0.6 | (0.3) | 1.1 | 0.1 |
| State | 0.1 | (0.1) | 0.2 | 0 |
| Noncurrent Income Tax Expense (Benefit), Total | 0.7 | (0.4) | 1.3 | 0.1 |
| Investment tax credit | ||||
| Amortization | (0.3) | (0.4) | (0.5) | (0.9) |
| Total income tax expense | $ 20.3 | $ 23.0 | $ 25.7 | $ 19.7 |
| Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] | ||||
| Federal statutory income tax (in hundredths) | 35.00% | 35.00% | 35.00% | 35.00% |
| Differences between book and tax depreciation not normalized (in hundredths) | (0.70%) | 1.30% | (0.10%) | 2.70% |
| Amortization of investments tax credits (in hundredths) | (0.40%) | (0.70%) | (0.60%) | (1.40%) |
| Federal income tax credits (in hundredths) | (5.70%) | (4.90%) | (7.70%) | (9.30%) |
| State income taxes (in hundredths) | 3.80% | 4.00% | 3.80% | 4.10% |
| Changes in uncertain tax positions, net (in hundredths) | (0.10%) | 0.00% | (0.10%) | 0.00% |
| Effective Income Tax Rate Reconciliation, Other Adjustments | (0.30%) | (0.20%) | (0.40%) | (1.10%) |
| Effective Income Tax Rate, Continuing Operations, Total | 31.60% | 34.50% | 29.90% | 30.00% |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The noncurrent component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations. No definition available.
|
| X | ||||||||||
|
- Definition
The noncurrent component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of foreign enacted tax law to the foreign taxable Income or Loss from continuing operations. No definition available.
|
| X | ||||||||||
|
- Definition
The noncurrent component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The noncurrent component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations. No definition available.
|
| X | ||||||||||
|
- Definition
The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The component of total income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the different depreciation methods allowed under generally accepted accounting principles and enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in all income tax contingencies, whether recorded or adjusted, during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by investment tax credits generated or utilized under enacted tax laws during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by tax credits, not otherwise listed in the existing taxonomy, generated or utilized under enacted tax laws during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Taxes Deferred Income Taxes (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2013
|
|
| Net Operating Losses Reclassified | $ 60.3 |
| X | ||||||||||
|
- Definition
Amount of Net Operating Losses reclassified from current deferred income tax asset to noncurrent deferred income tax liability driven by the expected timing of their utilization due to the extension of 50% bonus depreciation with the January 2, 2013, enactment of the American Taxpayer Relief Act of 2012. No definition available.
|
|
Taxes Uncertain Tax Positions (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
|
| Uncertain Tax Positions [Line Items] | ||
| Amount expected to impact the effective tax rate if recognized | $ 6.7 | $ 7.3 |
| Accrued interest related to unrecognized tax benefits | 3.3 | 3.5 |
| Accrued penalties with respect to unrecognized tax benefits | 0.6 | 0.7 |
| Amount of unrecognized tax benefits that may be recognized in the next twelve months due to statute expirations or settlement agreements with tax authorities | 0.9 | |
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
| Balance at beginning of period | 21.4 | 24.0 |
| Additions for current year tax positions | 1.8 | 3.7 |
| Reductions for current year tax positions | (0.2) | 0 |
| Reductions for prior year tax positions | (0.5) | (1.8) |
| Statute expirations | (0.2) | (4.7) |
| Foreign currency translation adjustments | (0.3) | 0.2 |
| Balance at end of period | 22.0 | 21.4 |
|
Kansas City Power and Light Company [Member]
|
||
| Uncertain Tax Positions [Line Items] | ||
| Amount expected to impact the effective tax rate if recognized | 0 | 0 |
| Amount of unrecognized tax benefits expected to decrease in the third quarter of 2013 due to new IRS accounting guidance provided to the Company | 11.8 | |
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
| Balance at beginning of period | 10.5 | 8.7 |
| Additions for current year tax positions | 1.8 | 3.6 |
| Reductions for current year tax positions | 0 | 0 |
| Reductions for prior year tax positions | (0.5) | (1.6) |
| Statute expirations | 0 | (0.2) |
| Foreign currency translation adjustments | 0 | 0 |
| Balance at end of period | $ 11.8 | $ 10.5 |
| X | ||||||||||
|
- Definition
The amount of the unrecognized tax benefit of a position taken for which it is expected that the total amount thereof will significantly increase or decrease in the third quarter of 2013. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
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- Details
|
| X | ||||||||||
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- Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The gross amount of decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
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- Definition
The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Gross amount of increases in unrecognized tax benefits resulting from foreign currency translation. No definition available.
|
| X | ||||||||||
|
- Definition
This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Taxes Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2013
|
|
| Subsequent Event [Line Items] | |
| Subsequent Event Amount | $ 11.8 |
| Subsequent Event Description | In July 2013, the IRS provided guidance to the Company regarding the audit of certain income tax accounting methods for the capitalization of assets. Based on this new guidance, the Company expects to reduce unrecognized tax benefits for these income tax accounting methods by $11.8 million for Great Plains Energy and KCP&L in the third quarter of 2013. This $11.8 million reduction in unrecognized tax benefits will be offset by an increase to deferred income tax liabilities since a significant portion of the unrecognized tax benefits were related to temporary tax differences. |
| X | ||||||||||
|
- Definition
Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Segments and Related Information (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Dec. 31, 2012
|
|||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | $ 600.3 | $ 603.6 | $ 1,142.5 | $ 1,083.3 | |||||
| Depreciation and amortization | (72.6) | (67.9) | (142.8) | (135.3) | |||||
| Interest charges | (49.4) | (55.8) | (99.1) | (122.7) | |||||
| Income tax (expense) benefit | (32.7) | (31.8) | (44.2) | (22.3) | |||||
| Net income (loss) attributable to Great Plains Energy | 63.6 | 58.1 | 89.6 | 49.0 | |||||
| Assets, Total | 9,764.0 | 9,764.0 | 9,647.3 | ||||||
| Capital expenditures | 339.8 | [1] | 610.2 | [1] | |||||
|
Electric Utility Segment [Member]
|
|||||||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | 600.3 | 603.6 | 1,142.5 | 1,083.3 | |||||
| Depreciation and amortization | (72.6) | (67.9) | (142.8) | (135.3) | |||||
| Interest charges | (47.4) | (50.4) | (95.2) | (101.1) | |||||
| Income tax (expense) benefit | (33.9) | (35.9) | (46.5) | (34.1) | |||||
| Net income (loss) attributable to Great Plains Energy | 65.5 | 63.8 | 93.1 | 68.3 | |||||
| Assets, Total | 10,124.6 | 10,124.6 | 9,910.6 | ||||||
| Capital expenditures | 339.8 | [1] | 610.2 | [1] | |||||
|
All Other Segments [Member]
|
|||||||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | 0 | 0 | 0 | 0 | |||||
| Depreciation and amortization | 0 | 0 | 0 | 0 | |||||
| Interest charges | (14.6) | (15.1) | (29.1) | (40.2) | |||||
| Income tax (expense) benefit | 1.2 | 4.1 | 2.3 | 11.8 | |||||
| Net income (loss) attributable to Great Plains Energy | (1.9) | (5.7) | (3.5) | (19.3) | |||||
| Assets, Total | 63.9 | 63.9 | 122.4 | ||||||
| Capital expenditures | 0 | [1] | 0 | [1] | |||||
|
Intersegment Elimination [Member]
|
|||||||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | 0 | 0 | 0 | 0 | |||||
| Depreciation and amortization | 0 | 0 | 0 | 0 | |||||
| Interest charges | 12.6 | 9.7 | 25.2 | 18.6 | |||||
| Income tax (expense) benefit | 0 | 0 | 0 | 0 | |||||
| Net income (loss) attributable to Great Plains Energy | 0 | 0 | 0 | 0 | |||||
| Assets, Total | (424.5) | (424.5) | (385.7) | ||||||
| Capital expenditures | $ 0 | [1] | $ 0 | [1] | |||||
|
|||||||||
| X | ||||||||||
|
- Definition
Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The aggregate revenue, whether regulated or unregulated, derived from the generation, transmission and distribution of electricity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Regulatory Matters (Details) (USD $)
In Millions, unless otherwise specified |
Jan. 26, 2013
|
|---|---|
|
Kansas City Power and Light Company [Member] | Rate jurisdiction - Missouri [Member]
|
|
| Regulatory Proceedings [Line Items] | |
| Annual revenue increase authorized | $ 67.4 |
|
KCPL Greater Missouri Operations [Member] | Rate jurisdiction - St. Joseph Light and Power division [Member]
|
|
| Regulatory Proceedings [Line Items] | |
| Annual revenue increase authorized | 21.7 |
|
KCPL Greater Missouri Operations [Member] | Rate jurisdiction - Missouri Public Service division [Member]
|
|
| Regulatory Proceedings [Line Items] | |
| Annual revenue increase authorized | $ 26.2 |
| X | ||||||||||
|
- Definition
The annual increase in revenue from retail rate increase authorized by the state. No definition available.
|
| X | ||||||||||
|
- Details
|
|
Regulatory Matters Asset (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Regulatory Assets [Line Items] | ||
| Regulatory Assets, Noncurrent | $ 1,046.2 | $ 1,120.9 |
| Regulatory Liability, Noncurrent | 246.0 | 283.8 |
|
Kansas City Power and Light Company [Member]
|
||
| Regulatory Assets [Line Items] | ||
| Regulatory Assets, Noncurrent | 818.0 | 853.2 |
| Regulatory Liability, Noncurrent | $ 156.1 | $ 153.0 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Regulatory Matters Liabilities (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Regulatory Liabilities [Line Items] | ||
| Regulatory Liabilities | $ 246.0 | $ 283.8 |
|
Kansas City Power and Light Company [Member]
|
||
| Regulatory Liabilities [Line Items] | ||
| Regulatory Liabilities | $ 156.1 | $ 153.0 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|