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Document And Entity Information
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6 Months Ended | |
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Jun. 30, 2015
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Aug. 03, 2015
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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 Common Stock, Shares Outstanding | 154,333,594 | |
| Document Fiscal Year Focus | 2015 | |
| Document Fiscal Period Focus | Q2 | |
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Jun. 30, 2015 |
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If the value is true, then the document is an amendment to previously-filed/accepted document. No definition available.
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End date of current fiscal year in the format --MM-DD. No definition available.
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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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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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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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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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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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- 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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- 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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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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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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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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- 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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- Definition
Includes 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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- 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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- Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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- Definition
Total costs of sales and operating expenses for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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- Definition
The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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. No definition available.
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- 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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- 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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- 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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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- 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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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition
Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and 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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- Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans. No definition available.
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- 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
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- 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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- 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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- 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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- Definition
Amount of operating expense for fuel used by regulated operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of operating expense for purchased power of regulated operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- 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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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2015
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Dec. 31, 2014
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| Current Assets | ||||||
| Cash and cash equivalents | $ 12.2 | $ 13.0 | ||||
| Funds on deposit | 2.9 | 1.2 | ||||
| Receivables, net | 196.2 | 160.3 | ||||
| Accounts receivable pledged as collateral | 163.0 | 171.0 | ||||
| Fuel inventories, at average cost | 102.3 | 90.1 | ||||
| Materials and supplies, at average cost | 152.4 | 152.7 | ||||
| Deferred refueling outage costs | 30.2 | 12.5 | ||||
| Refundable income taxes | 3.4 | 3.1 | ||||
| Deferred income taxes | 89.9 | 78.1 | ||||
| Prepaid expenses and other assets | 35.6 | 36.9 | ||||
| Assets, Current, Total | 788.1 | 718.9 | ||||
| Utility Plant, at Original Cost | ||||||
| Electric | 13,017.0 | 12,128.7 | ||||
| Less-accumulated depreciation | 4,847.0 | 4,828.3 | ||||
| Net utility plant in service | 8,170.0 | 7,300.4 | ||||
| Construction work in progress | 296.8 | 900.0 | ||||
| Nuclear Fuel, Net of Amortization | 71.1 | 79.2 | ||||
| Public Utilities, Property, Plant and Equipment, Net | 8,537.9 | 8,279.6 | ||||
| Investments and Other Assets | ||||||
| Nuclear decommissioning trust fund | 203.3 | 199.0 | ||||
| Regulatory Assets | 986.1 | 1,034.6 | ||||
| Goodwill | 169.0 | 169.0 | ||||
| Other Assets, Noncurrent | 77.8 | 74.6 | ||||
| Investments and Other Assets, Total | 1,436.2 | 1,477.2 | ||||
| Assets, Total | 10,762.2 | 10,475.7 | ||||
| Current Liabilities | ||||||
| Notes payable | 11.0 | 4.0 | ||||
| Collateralized note payable | 163.0 | 171.0 | ||||
| Commercial paper | 629.3 | 358.3 | ||||
| Current maturities of long-term debt | 1.1 | 15.1 | ||||
| Accounts payable | 255.8 | 388.0 | ||||
| Accrued taxes | 78.0 | 30.4 | ||||
| Accrued interest | 40.0 | 41.3 | ||||
| Accrued compensation and benefits | 38.9 | 35.2 | ||||
| Pension and post-retirement liability | 2.8 | 2.8 | ||||
| Other Liabilities, Current | 28.8 | 24.7 | ||||
| Liabilities, Current, Total | 1,248.7 | 1,070.8 | ||||
| Deferred Credits and Other Liabilities | ||||||
| Deferred income taxes | 1,132.9 | 1,089.7 | ||||
| Deferred tax credits | 125.3 | 126.0 | ||||
| Asset retirement obligations | 271.5 | 195.9 | ||||
| Pension and post-retirement liability | 505.9 | 508.6 | ||||
| Regulatory liabilities | 290.7 | 282.7 | ||||
| Other Liabilities, Noncurrent | 81.7 | 88.9 | ||||
| Liabilities, Noncurrent, Total | 2,408.0 | 2,291.8 | ||||
| Common shareholders' equity | ||||||
| Common Stock, Value, Issued | 2,643.7 | 2,639.3 | ||||
| Retained earnings | 954.2 | 967.8 | ||||
| Treasury Stock, Value | (2.5) | (2.3) | ||||
| Accumulated other comprehensive loss | (15.6) | [1] | (18.7) | [1] | ||
| Common Shareholders' Equity, Total | 3,579.8 | 3,586.1 | ||||
| Cumulative preferred stock $100 par value | ||||||
| Preferred Stock, Value, Issued | 39.0 | 39.0 | ||||
| Long-term debt | 3,486.7 | 3,488.0 | ||||
| Total Capitalization | 7,105.5 | 7,113.1 | ||||
| Commitments and Contingencies | ||||||
| Liabilities and Equity, Total | 10,762.2 | 10,475.7 | ||||
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Preferred Stock 3 Point 80 [Member]
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| Cumulative preferred stock $100 par value | ||||||
| Preferred Stock, Value, Issued | 10.0 | 10.0 | ||||
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Preferred Stock 4 Point 50 [Member]
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| Cumulative preferred stock $100 par value | ||||||
| Preferred Stock, Value, Issued | 10.0 | 10.0 | ||||
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Preferred Stock 4 Point 20 [Member]
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| Cumulative preferred stock $100 par value | ||||||
| Preferred Stock, Value, Issued | 7.0 | 7.0 | ||||
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Preferred Stock 4 Point 35 [Member]
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| Cumulative preferred stock $100 par value | ||||||
| Preferred Stock, Value, Issued | 12.0 | 12.0 | ||||
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Kansas City Power and Light Company [Member]
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| Current Assets | ||||||
| Cash and cash equivalents | 2.9 | 2.7 | ||||
| Funds on deposit | 1.0 | 0.6 | ||||
| Receivables, net | 144.9 | 128.9 | ||||
| Related party receivables | 54.1 | 68.8 | ||||
| Accounts receivable pledged as collateral | 110.0 | 110.0 | ||||
| Fuel inventories, at average cost | 70.7 | 58.8 | ||||
| Materials and supplies, at average cost | 110.0 | 110.1 | ||||
| Deferred refueling outage costs | 30.2 | 12.5 | ||||
| Refundable income taxes | 0 | 57.5 | ||||
| Deferred income taxes | 1.0 | 5.0 | ||||
| Prepaid expenses and other assets | 31.5 | 32.7 | ||||
| Assets, Current, Total | 556.3 | 587.6 | ||||
| Utility Plant, at Original Cost | ||||||
| Electric | 9,532.6 | 8,737.3 | ||||
| Less-accumulated depreciation | 3,645.5 | 3,658.7 | ||||
| Net utility plant in service | 5,887.1 | 5,078.6 | ||||
| Construction work in progress | 204.4 | 791.2 | ||||
| Nuclear Fuel, Net of Amortization | 71.1 | 79.2 | ||||
| Public Utilities, Property, Plant and Equipment, Net | 6,162.6 | 5,949.0 | ||||
| Investments and Other Assets | ||||||
| Nuclear decommissioning trust fund | 203.3 | 199.0 | ||||
| Regulatory Assets | 726.1 | 745.7 | ||||
| Other Assets, Noncurrent | 30.0 | 29.5 | ||||
| Investments and Other Assets, Total | 959.4 | 974.2 | ||||
| Assets, Total | 7,678.3 | 7,510.8 | ||||
| Current Liabilities | ||||||
| Collateralized note payable | 110.0 | 110.0 | ||||
| Commercial paper | 484.0 | 358.3 | ||||
| Current maturities of long-term debt | 0 | 14.0 | ||||
| Accounts payable | 215.3 | 305.2 | ||||
| Related party payables | 0 | 12.6 | ||||
| Accrued taxes | 60.5 | 23.6 | ||||
| Accrued interest | 27.5 | 29.0 | ||||
| Accrued compensation and benefits | 38.9 | 35.2 | ||||
| Pension and post-retirement liability | 1.5 | 1.5 | ||||
| Other Liabilities, Current | 12.5 | 12.4 | ||||
| Liabilities, Current, Total | 950.2 | 901.8 | ||||
| Deferred Credits and Other Liabilities | ||||||
| Deferred income taxes | 1,033.0 | 1,016.9 | ||||
| Deferred tax credits | 123.8 | 124.3 | ||||
| Asset retirement obligations | 234.6 | 177.7 | ||||
| Pension and post-retirement liability | 483.0 | 485.4 | ||||
| Regulatory liabilities | 173.7 | 172.0 | ||||
| Other Liabilities, Noncurrent | 61.1 | 59.2 | ||||
| Liabilities, Noncurrent, Total | 2,109.2 | 2,035.5 | ||||
| Common shareholders' equity | ||||||
| Common Stock, Value, Issued | 1,563.1 | 1,563.1 | ||||
| Retained earnings | 769.4 | 726.8 | ||||
| Accumulated other comprehensive loss | (12.2) | (14.9) | ||||
| Common Shareholders' Equity, Total | 2,320.3 | 2,275.0 | ||||
| Cumulative preferred stock $100 par value | ||||||
| Long-term debt | 2,298.6 | 2,298.5 | ||||
| Total Capitalization | 4,618.9 | 4,573.5 | ||||
| Commitments and Contingencies | ||||||
| Liabilities and Equity, Total | $ 7,678.3 | $ 7,510.8 | ||||
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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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The total of investments and other long-term assets. No definition available.
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Period end amount of total net PPE in service No definition available.
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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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Amount for accounts payable to related parties. 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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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- 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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- 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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- 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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- 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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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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- 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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- 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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- 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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- 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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- 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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- 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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- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of obligation due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of long-term debt, after 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 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| 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
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- Definition
Period end amount of construction work in progress in public utility. No definition available.
|
| X | ||||||||||
|
- Definition
Period end amount of total net PPE. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Period end amount of total gross PPE. No definition available.
|
| X | ||||||||||
|
- 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
|
| 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
|
| X | ||||||||||
|
- Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit. 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 | ||||||||||
|
- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
|
Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2015
|
Dec. 31, 2014
|
|
| Utility Plant, at Original Cost | ||
| Nuclear fuel, amortization | $ 175.7 | $ 187.5 |
| Common shareholder's equity | ||
| Common stock - shares authorized (in shares) | 250,000,000.0 | 250,000,000.0 |
| Common stock-shares issued (in shares) | 154,422,890.0 | 154,254,037.0 |
| Treasury stock- shares (in shares) | 96,463 | 91,281 |
|
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% |
|
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% |
|
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% |
|
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 | $ 175.7 | $ 187.5 |
| Common shareholder's equity | ||
| Common stock - shares authorized (in shares) | 1,000.0 | 1,000.0 |
| Common stock-shares issued (in shares) | 1.0 | 1.0 |
| X | ||||||||||
|
- Definition
Amortization based on the energy produced over the life of the fuel. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
The percentage rate used to calculate dividend payments on preferred stock. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
|
Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified |
6 Months Ended | ||||
|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
||||
| Cash Flows from Operating Activities | |||||
| Net income (loss) | $ 63.3 | $ 75.9 | |||
| Adjustments to reconcile income to net cash from operating activities: | |||||
| Depreciation and amortization | 163.3 | 150.1 | |||
| Amortization of: | |||||
| Nuclear fuel | 10.0 | 10.3 | |||
| Other | 23.6 | 26.1 | |||
| Deferred income taxes, net | 31.3 | 38.4 | |||
| Investment tax credit amortization | (0.7) | (0.8) | |||
| (Income) loss from equity investments, net of income taxes | (0.7) | (0.2) | |||
| Other operating activities | (73.4) | (127.9) | |||
| Net cash from operating activities | 216.7 | 171.9 | |||
| Cash Flows from Investing Activities | |||||
| Utility capital expenditures | (366.8) | [1] | (352.9) | ||
| Allowance for borrowed funds used during construction | (3.6) | (6.9) | |||
| Purchases of nuclear decommissioning trust investments | (22.3) | (13.9) | |||
| Proceeds from nuclear decommissioning trust investments | 20.7 | 12.3 | |||
| Proceeds from sale of transmission assets | 0 | 37.7 | |||
| Other investing activities | (24.6) | (17.2) | |||
| Net cash from investing activities | (396.6) | (340.9) | |||
| Cash Flows from Financing Activities | |||||
| Issuance of common stock | 1.6 | 2.5 | |||
| Repayment of long-term debt | (15.1) | (13.4) | |||
| Net change in short-term borrowings | 278.0 | 259.3 | |||
| Net change in collateralized short-term borrowings | (8.0) | (4.0) | |||
| Dividends paid | (76.4) | (71.6) | |||
| Other financing activities | (1.0) | (1.9) | |||
| Net cash from financing activities | 179.1 | 170.9 | |||
| Net Change in Cash and Cash Equivalents | (0.8) | 1.9 | |||
| Cash and Cash Equivalents at Beginning of Year | 13.0 | 10.6 | |||
| Cash and Cash Equivalents at End of Period | 12.2 | 12.5 | |||
|
Kansas City Power and Light Company [Member]
|
|||||
| Cash Flows from Operating Activities | |||||
| Net income (loss) | 42.6 | 52.0 | |||
| Adjustments to reconcile income to net cash from operating activities: | |||||
| Depreciation and amortization | 116.3 | 104.3 | |||
| Amortization of: | |||||
| Nuclear fuel | 10.0 | 10.3 | |||
| Other | 14.1 | 15.5 | |||
| Deferred income taxes, net | 20.6 | 19.2 | |||
| Investment tax credit amortization | (0.5) | (0.5) | |||
| Other operating activities | 14.9 | (53.2) | |||
| Net cash from operating activities | 218.0 | 147.6 | |||
| Cash Flows from Investing Activities | |||||
| Utility capital expenditures | (297.4) | (293.4) | |||
| Allowance for borrowed funds used during construction | (2.5) | (6.0) | |||
| Purchases of nuclear decommissioning trust investments | (22.3) | (13.9) | |||
| Proceeds from nuclear decommissioning trust investments | 20.7 | 12.3 | |||
| Proceeds from sale of transmission assets | 0 | 4.7 | |||
| Other investing activities | (15.4) | (9.5) | |||
| Net cash from investing activities | (316.9) | (305.8) | |||
| Cash Flows from Financing Activities | |||||
| Repayment of long-term debt | (14.0) | 0 | |||
| Net change in short-term borrowings | 125.7 | 195.1 | |||
| Net money pool borrowings | (12.6) | (0.2) | |||
| Dividends paid | 0 | (36.0) | |||
| Net cash from financing activities | 99.1 | 158.9 | |||
| Net Change in Cash and Cash Equivalents | 0.2 | 0.7 | |||
| Cash and Cash Equivalents at Beginning of Year | 2.7 | 4.0 | |||
| Cash and Cash Equivalents at End of Period | $ 2.9 | $ 4.7 | |||
|
|||||
| X | ||||||||||
|
- Definition
The component of the allowance for funds used during construction during the period based on the interest rate on borrowed funds used in financing the construction of regulated assets. 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
The net cash inflows or outflows in money pool borrowings. 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. Includes effect from exchange rate changes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from 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
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| 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 amortization of other deferred costs recognized in the income statement. 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 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 cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. 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 (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]
|
|---|---|---|---|---|---|---|---|---|---|
| Beginning balance at Dec. 31, 2013 | $ 2,631.1 | $ 1,563.1 | $ 871.4 | $ 636.4 | $ (2.8) | $ (25.3) | $ (20.2) | ||
| Beginning balance, treasury stock (in shares) at Dec. 31, 2013 | (129,290) | ||||||||
| Beginning balance (in shares) at Dec. 31, 2013 | 153,995,621 | 1 | |||||||
| Issuance of common stock | 2.4 | ||||||||
| Issuance of common stock (in shares) | 95,745 | ||||||||
| Issuance of restricted common stock | 1.9 | ||||||||
| Issuance of restricted common stock (in shares) | 71,860 | ||||||||
| Equity compensation expense, net of forfeitures | 0.2 | ||||||||
| Unearned Compensation [Abstract] | |||||||||
| Issuance of restricted common stock | (1.9) | ||||||||
| Compensation expense recognized | 1.0 | ||||||||
| Stockholders' Equity, Other | 1.1 | ||||||||
| Net income (loss) | 75.9 | 52.0 | 75.9 | 52.0 | |||||
| Dividends: | |||||||||
| Common stock | (70.8) | (36.0) | |||||||
| Preferred stock - at required rates | (0.8) | ||||||||
| Performance shares | (0.4) | ||||||||
| Treasury shares acquired | (1.9) | ||||||||
| Treasury shares acquired (in shares) | (73,273) | ||||||||
| Treasury shares reissued | 2.4 | ||||||||
| Treasury shares reissued (in shares) | 112,369 | ||||||||
| Derivative hedging activity, net of tax | 5.3 | 2.7 | 5.3 | 2.7 | |||||
| Change in unrecognized pension expense, net of tax | 0.2 | 0.2 | |||||||
| Ending balance at Jun. 30, 2014 | 3,489.0 | 2,198.0 | 2,635.8 | 1,563.1 | 875.3 | 652.4 | (2.3) | (19.8) | (17.5) |
| Ending balance (in shares) at Jun. 30, 2014 | 154,163,226 | 1 | |||||||
| Ending balance, treasury stock (in shares) at Jun. 30, 2014 | (90,194) | ||||||||
| Beginning balance at Mar. 31, 2014 | |||||||||
| Unearned Compensation [Abstract] | |||||||||
| Net income (loss) | 52.1 | 34.8 | |||||||
| Dividends: | |||||||||
| Derivative hedging activity, net of tax | 2.5 | 1.4 | |||||||
| Change in unrecognized pension expense, net of tax | 0 | ||||||||
| Ending balance at Jun. 30, 2014 | 3,489.0 | 2,198.0 | 1,563.1 | ||||||
| Ending balance (in shares) at Jun. 30, 2014 | 1 | ||||||||
| Beginning balance at Dec. 31, 2014 | 3,586.1 | 2,275.0 | 2,639.3 | 1,563.1 | 967.8 | 726.8 | (2.3) | (18.7) | (14.9) |
| Beginning balance, treasury stock (in shares) at Dec. 31, 2014 | (91,281) | (91,281) | |||||||
| Beginning balance (in shares) at Dec. 31, 2014 | 154,254,037 | 1 | |||||||
| Issuance of common stock | 2.4 | ||||||||
| Issuance of common stock (in shares) | 90,916 | ||||||||
| Issuance of restricted common stock | 2.0 | ||||||||
| Issuance of restricted common stock (in shares) | 77,937 | ||||||||
| Equity compensation expense, net of forfeitures | 0.9 | ||||||||
| Unearned Compensation [Abstract] | |||||||||
| Issuance of restricted common stock | (2.0) | ||||||||
| Compensation expense recognized | 1.0 | ||||||||
| Stockholders' Equity, Other | 0.1 | ||||||||
| Net income (loss) | 63.3 | 42.6 | 63.3 | 42.6 | |||||
| Dividends: | |||||||||
| Common stock | (75.6) | 0 | |||||||
| Preferred stock - at required rates | (0.8) | ||||||||
| Performance shares | (0.5) | ||||||||
| Treasury shares acquired | (1.4) | ||||||||
| Treasury shares acquired (in shares) | (53,895) | ||||||||
| Treasury shares reissued | 1.2 | ||||||||
| Treasury shares reissued (in shares) | 48,713 | ||||||||
| Derivative hedging activity, net of tax | 2.8 | 2.7 | 2.8 | 2.7 | |||||
| Change in unrecognized pension expense, net of tax | 0.3 | 0.3 | |||||||
| Ending balance at Jun. 30, 2015 | 3,579.8 | 2,320.3 | 2,643.7 | 1,563.1 | 954.2 | 769.4 | (2.5) | (15.6) | (12.2) |
| Ending balance (in shares) at Jun. 30, 2015 | 154,422,890 | 1 | |||||||
| Ending balance, treasury stock (in shares) at Jun. 30, 2015 | (96,463) | (96,463) | |||||||
| Beginning balance at Mar. 31, 2015 | |||||||||
| Unearned Compensation [Abstract] | |||||||||
| Net income (loss) | 44.4 | 29.4 | |||||||
| Dividends: | |||||||||
| Derivative hedging activity, net of tax | 1.4 | 1.3 | |||||||
| Change in unrecognized pension expense, net of tax | 0.2 | ||||||||
| Ending balance at Jun. 30, 2015 | $ 3,579.8 | $ 2,320.3 | $ 1,563.1 | ||||||
| Ending balance (in shares) at Jun. 30, 2015 | 1 | ||||||||
| Ending balance, treasury stock (in shares) at Jun. 30, 2015 | (96,463) |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- 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
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| X | ||||||||||
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- 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.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Amount of paid and unpaid cash dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units. No definition available.
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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 | ||||||||||
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- Definition
Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and 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 | ||||||||||
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- Definition
Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension 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
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
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| X | ||||||||||
|
- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- 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.
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| X | ||||||||||
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- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. No definition available.
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| 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
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| X | ||||||||||
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- 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
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| X | ||||||||||
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- Definition
Aggregate value of stock related to Restricted Stock Awards issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. No definition available.
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| X | ||||||||||
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- 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
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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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| X | ||||||||||
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- 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
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| 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
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|
Consolidated Statements of Common Shareholders' Equity (Parenthetical) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2015
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Jun. 30, 2014
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Jun. 30, 2015
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Jun. 30, 2014
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| Stock Transactions, Parenthetical Disclosures [Abstract] | ||||
| Common Stock, Dividends, Per Share, Declared | $ 0.245 | $ 0.23 | $ 0.49 | $ 0.46 |
| 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 | ||||||||||
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- Details
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Summary of Significant Accounting Policies
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Jun. 30, 2015
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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 significant operations are as follows:
Great Plains Energy also wholly owns GPE Transmission Holding Company, LLC (GPETHC). GPETHC owns 13.5% of Transource Energy, LLC (Transource) with the remaining 86.5% owned by AEP Transmission Holding Company, LLC (AEPTHC), a subsidiary of American Electric Power Company, Inc. GPETHC accounts for its investment in Transource under the equity method. Transource is focused on the development of competitive electric transmission projects. 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 18 for additional information. Basic and Diluted Earnings per Common Share Calculation To determine basic earnings per common share (EPS), preferred stock dividend requirements 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 and restricted stock. 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 2015, Great Plains Energy's Board of Directors (Board) declared a quarterly dividend of $0.245 per share on Great Plains Energy's common stock. The common dividend is payable September 21, 2015, to shareholders of record as of August 28, 2015. The Board also declared regular dividends on Great Plains Energy's preferred stock, payable December 1, 2015, to shareholders of record as of November 6, 2015. New Accounting Standards In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in Generally Accepted Accounting Principles (GAAP) when it becomes effective. In July 2015, the FASB approved a one year deferral of the effective date of ASU No. 2014-09. A final ASU formally amending the effective date of ASU No. 2014-09 from January 1, 2017, to January 1, 2018, is expected to be issued in the third quarter of 2015. The standard permits the use of either the retrospective or cumulative effect transition method. The Companies are evaluating the effect that ASU No. 2014-09 will have on their consolidated financial statements and related disclosures. The Companies have not yet selected a transition method nor have they determined the effect of the standard on their ongoing financial reporting. In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs, which requires that debt issuance costs related to a recognized debt liability be presented on the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. Great Plains Energy and KCP&L currently include debt issuance costs in Other - Investments and Other Assets on their consolidated balance sheets. The new guidance is to be applied retrospectively and is effective for interim and annual periods beginning after December 15, 2015, with early adoption permitted. The Companies intend to early adopt ASU No. 2015-03 for the 2015 Form 10-K. |
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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
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Jun. 30, 2015
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| Supplemental Cash Flow Elements [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cash Flow, Supplemental Disclosures [Text Block] | 2. SUPPLEMENTAL CASH FLOW INFORMATION
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- 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 | ||||||||||
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- Details
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Receivables
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Jun. 30, 2015
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| Receivables [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans Notes Trade And Other Receivables Disclosure And Transfers And Servicing Of Financial Asset [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, 2015, and December 31, 2014, 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 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, 2015, and December 31, 2014, Great Plains Energy's accounts receivable pledged as collateral and the corresponding short-term collateralized note payable were $163.0 million and $171.0 million, respectively. At June 30, 2015, and December 31, 2014, 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 each receive an annual servicing fee of 1.5% 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 2015 and allows for $110 million in aggregate outstanding principal amount at any time. GMO's agreement expires in September 2015 and allows for $65 million in aggregate outstanding principal from mid-November 2014 through mid-June 2015 and then increases to $80 million through September 2015. KCP&L and GMO expect to renew these agreements for at least one 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.
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- Definition
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, 2015
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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. Wolf Creek paid the DOE a quarterly fee of one-tenth of a cent for each kilowatt hour (kWh) of net nuclear generation delivered and sold for the future disposal of spent nuclear fuel. KCP&L's 47% share of these costs were charged to fuel expense. The Nuclear Energy Institute, a number of individual utilities, and the National Association of Regulatory Utility Commissioners sued the DOE seeking the suspension of this fee. In January 2014, the DOE submitted a proposal to Congress to set the fee at zero, which became effective on May 16, 2014. 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. In 2011, the NRC reexamined its decision and ordered the licensing board, consistent with budgetary limitations, to close out its work on the DOE's application. In August 2013, a federal court of appeals ruled that the NRC must resume its review of the DOE's application. Wolf Creek is currently evaluating alternatives for expanding its existing on-site spent nuclear fuel storage to provide additional capacity prior to 2025. Management cannot predict when, or if, an off-site storage site or 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, 2015, 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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- Definition
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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Regulatory Matters
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Jun. 30, 2015
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| Regulated Operations [Abstract] | |
| Regulatory Matters | 5. REGULATORY MATTERS KCP&L Kansas Rate Case Proceedings In January 2015, KCP&L filed an application with The State Corporation Commission of the State of Kansas (KCC) to request an increase to its retail revenues of $67.3 million, with a return on equity of 10.3% and a rate-making equity ratio of 50.48%. The request includes costs to install environmental upgrades at the La Cygne Station, upgrades at Wolf Creek and other infrastructure and system improvements made to be able to provide reliable electric service. Testimony from KCC staff and other parties regarding the case was filed in May 2015. The KCC staff's testimony recommended a return on equity of 9.25% and a revenue increase of $44 million. In June 2015, KCP&L and KCC staff filed a unanimous partial settlement agreement that would resolve most issues in the case, except return on equity and a few other issues. The partial settlement agreement is pending KCC approval. The outcome of the KCP&L Kansas rate case will likely be different from either of the positions of KCP&L or KCC staff, though the decision of the KCC cannot be predicted. New rates will be effective on October 1, 2015. KCP&L Missouri Rate Case Proceedings In October 2014, KCP&L filed an application with the Public Service Commission of the State of Missouri (MPSC) to request an increase to its retail revenues of $120.9 million, with a return on equity of 10.3% and a rate-making equity ratio of 50.36%. The request includes recovery of increased transmission and property tax expenses, costs to install environmental upgrades at the La Cygne Station, upgrades at Wolf Creek and other infrastructure and system improvements made to be able to provide reliable electric service. KCP&L also requested authorization to implement a Fuel Adjustment Clause (FAC). True-up testimony from KCP&L, MPSC staff and other parties regarding the case was filed in July 2015. Several issues in the case have been resolved and are reflected in the true-up testimony of KCP&L and MPSC staff. KCP&L's true-up testimony requests an increase to its retail revenues of $112.7 million, with a return on equity of 10.3%. The MPSC staff's true-up testimony recommended a return on equity range from 9.0% to 9.5% and a revenue increase range of approximately $76.8 million to $87.3 million. KCP&L's request to implement a FAC is still pending MPSC approval. The outcome of the KCP&L Missouri rate case will likely be different from either of the positions of KCP&L or MPSC staff, though the decision of the MPSC cannot be predicted. New rates will be effective on or around September 30, 2015. |
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The entire disclosure for public utilities. No definition available.
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Asset Retirement Obligations
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Jun. 30, 2015
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| Asset Retirement Obligation Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Asset Retirement Obligations [Text Block] | 6. ASSET RETIREMENT OBLIGATIONS Asset retirement obligations (AROs) associated with tangible long-lived assets are legal obligations that exist under enacted laws, statutes and written or oral contracts, including obligations arising under the doctrine of promissory estoppel. These liabilities are recognized at estimated fair value as incurred with a corresponding amount capitalized as part of the cost of the related long-lived assets and depreciated over their useful lives. Accretion of the liabilities due to the passage of time is recorded to a regulatory asset and/or liability. Changes in the estimated fair values of the liabilities are recognized when known. KCP&L has AROs related to decommissioning Wolf Creek, site remediation of its Spearville Wind Energy Facilities, asbestos abatement, removal of storage tanks and closure of ponds and landfills containing coal combustion residuals (CCRs). GMO has AROs related to asbestos abatement, removal of storage tanks and closure of ponds and landfills containing CCRs. Additionally, certain wiring used in Great Plains Energy's and KCP&L's generating stations include asbestos insulation, which would require special handling if disturbed. Due to the inability to reasonably estimate the quantities or the amount of disturbance that will be necessary during dismantlement at the end of the life of a plant, the fair value of this ARO cannot be reasonably estimated at this time. Management will continue to monitor the obligation and will recognize a liability in the period in which sufficient information becomes available to reasonably estimate its fair value. On April 17, 2015, the Environmental Protection Agency (EPA) published new regulations to regulate the disposal of CCRs at electric generating facilities. See Note 11 under the heading Solid Waste for additional information regarding the CCR rule. The CCR rule represents legal obligations of Great Plains Energy and KCP&L as to the closure of its ponds and landfills containing CCRs. As a result of the CCR rule, Great Plains Energy and KCP&L increased their AROs $69.5 million and $51.3 million, respectively. The following table summarizes the change in Great Plains Energy's and KCP&L's AROs.
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- Definition
The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service 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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Pension Plans and Other Employee Benefits
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| Compensation and Retirement Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pension Plans and Other Employee Benefits | 7. 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 and GMO, and its 47% ownership share of Wolf Creek Nuclear Operating Corporation (WCNOC) defined benefit plans. For the majority of employees, pension benefits under these plans reflect the employees' compensation, years of service and age at retirement; however, for union employees hired after October 1, 2013, the benefits are derived from a cash balance account formula. Effective in 2014, the KCP&L non-union plan was closed to future employees. Great Plains Energy also provides certain post-retirement health care and life insurance benefits for substantially all retired employees of KCP&L, GMO and its 47% ownership share of WCNOC. KCP&L and GMO record pension and post-retirement expense in accordance with rate orders from the MPSC and KCC that allow the difference between pension and post-retirement costs under 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 provides 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, 2015, Great Plains Energy contributed $36.3 million to the pension plans and expects to contribute an additional $42.6 million in 2015 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 2015, Great Plains Energy expects to make contributions of $10.2 million to the post-retirement benefit plans, the majority of which is expected to be paid by KCP&L. |
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Equity Compensation
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity Compensation | 8. 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, 2015, is summarized in the following table. Performance adjustment represents the number of shares of common stock issued related to performance shares and 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, 2015, the remaining weighted-average contractual term was 1.5 years. There were no shares granted for the three months ended June 30, 2015, and 2014, respectively. The weighted-average grant-date fair value of shares granted was $24.06 and $28.78 year to date June 30, 2015, and 2014, respectively. At June 30, 2015, there was $8.9 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 was $0.5 million and $2.8 million year to date June 30, 2015, and 2014, respectively. 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 2015, inputs for expected volatility, dividend yield and risk-free rates were 16%, 3.72% and 1.02%, respectively. Restricted Stock Restricted stock activity year to date June 30, 2015, is summarized in the following table.
* weighted-average At June 30, 2015, the remaining weighted-average contractual term was 1.7 years. There were no shares granted for the three months ended June 30, 2015. The weighted-average grant-date fair value of shares granted was $26.18 year to date June 30, 2015. The weighted-average grant-date fair value of shares granted was $25.54 and $25.72 for the three months ended and year to date June 30, 2014, respectively. At June 30, 2015, 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 $0.1 million and $2.0 million for the three months ended and year to date June 30, 2015. The total fair value of shares vested was $0.2 million and $1.5 million for the three months ended and year to date June 30, 2014, respectively. |
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Short-term Borrowings and Short-term Bank Lines of Credit
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Jun. 30, 2015
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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] | 9. 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 October 2019. 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. In May 2015, GMO transferred $50 million of unused commitments to Great Plains Energy and Great Plains Energy transferred $200 million in unused commitments to KCP&L. 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, 2015, Great Plains Energy was in compliance with this covenant. At June 30, 2015, Great Plains Energy had $11.0 million of outstanding cash borrowings at a weighted-average interest rate of 1.69% and had issued $0.2 million in letters of credit under the credit facility. At December 31, 2014, Great Plains Energy had $4.0 million of outstanding cash borrowings at a weighted-average interest rate of 1.69% and had issued no letters of credit 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 October 2019. 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. In May 2015, Great Plains Energy transferred $200 million of unused commitments to KCP&L. 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, 2015, KCP&L was in compliance with this covenant. At June 30, 2015, KCP&L had $484.0 million of commercial paper outstanding at a weighted-average interest rate of 0.49%, had issued letters of credit totaling $2.7 million and had no outstanding cash borrowings under the credit facility. At December 31, 2014, KCP&L had $358.3 million of commercial paper outstanding at a weighted-average interest rate of 0.48%, had issued letters of credit totaling $2.7 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 October 2019. Great Plains Energy and GMO may transfer up to $200 million of unused commitments between Great Plains Energy's and GMO's facilities. In May 2015, GMO transferred $50 million of unused commitments to Great Plains Energy. A default by GMO 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, 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, 2015, GMO was in compliance with this covenant. At June 30, 2015, GMO had $145.3 million of commercial paper outstanding at a weighted-average interest rate of 0.45%, had issued letters of credit totaling $3.0 million and had no outstanding cash borrowings under the credit facility. At December 31, 2014, GMO had no commercial paper outstanding, had issued letters of credit totaling $3.2 million and had no outstanding cash borrowings under the credit facility. |
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| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-Term Debt | 10. LONG-TERM DEBT Great Plains Energy's and KCP&L's long-term debt is detailed in the following table.
KCP&L General Mortgage Bonds In March 2015, KCP&L repaid its $14.0 million secured Series 2005 Environmental Improvement Revenue Refunding (EIRR) bonds at maturity. |
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Commitments and Contingencies
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments and Contingencies | 11. 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 estimates of capital expenditures (exclusive of Allowance for Funds Used During Construction (AFUDC) and property taxes) over the next five years to comply with environmental regulations are in the following table. The total cost of compliance with any existing, proposed or future laws and regulations may be significantly different from these cost estimates provided.
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 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. Best Available Retrofit Technology (BART) 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. KCP&L expects the final cost of the project to be approximately $75 million below the $1.23 billion cost estimate. KCP&L's 50% share of the estimated cost is $615 million. In September 2011, KCP&L commenced construction of the La Cygne Station project and at June 30, 2015, had incurred approximately $524 million of cash capital expenditures. The remaining cash capital expenditures are included in the estimated capital expenditures table above. The environmental equipment was placed in-service at La Cygne No. 2 in March 2015 and at La Cygne No. 1 in April 2015. Mercury and Air Toxics Standards (MATS) 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. MATS Rule compliance commenced at KCP&L’s Iatan Station in April 2015 and will commence at KCP&L's La Cygne Station in December 2015. In June 2015, the U.S. Supreme Court reversed the judgment of the Court of Appeals for the D.C. Circuit, which had upheld the MATS Rule, and remanded the MATS Rule for further proceedings consistent with its opinion. The Supreme Court held that the EPA was required by the Clean Air Act, but had failed, to consider costs when the EPA made the initial decision that regulating air toxics was appropriate and necessary. KCP&L’s and GMO’s other affected coal-fired units will take actions to be compliant in April 2016, unless the D.C. Circuit Court issues an order which results in alternate compliance actions. Estimated costs to comply with the MATS Rule are included in the estimated capital expenditures table above. 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 became effective in January 2013 and allows three to four years for compliance. Estimated costs to comply with the Industrial Boiler Rule are included in the estimated capital expenditures table above. SO2 NAAQS In June 2010, the EPA adopted a more stringent primary National Ambient Air Quality Standard (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 state implementation plan to the EPA to return the area to attainment of the standard, which may include stricter controls on certain industrial facilities. The Companies are unable to determine if there will be any financial and/or operational impacts until the state implementation plan is complete. 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, regulations or treaties 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 22 million tons and 17 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 August 2015, the EPA finalized CO2 emission standards for new, modified and reconstructed affected fossil-fuel-fired electric utility generating units. The standards would not apply to Great Plains Energy's and KCP&L's existing units unless the units were modified or reconstructed in the future. In August 2015, the EPA finalized its Clean Power Plan which sets CO2 emission performance rates for existing affected fossil fuel-fired electric generating units. Specifically, the EPA translated those performance rates into a state goal measured in mass and rate based on each state’s generation mix. The states have the ability to develop their own plans for affected units to achieve either the performance rates directly or the state goals, with guidelines for the development, submittal and implementation of those plans. Nationwide, by 2030, the EPA projects the Clean Power Plan would achieve CO2 emission reductions from the power sector of approximately 32% from CO2 emission levels in 2005. The EPA has finalized an interim CO2 goal rate reduction in Kansas and Missouri (average of 2022-2029) of 34% and 26%, respectively, and 2030 targets in Kansas and Missouri of 44% and 37%, respectively. The baseline for these reductions is 2012 CO2 emissions adjusted by the EPA. The EPA has also finalized mass based CO2 reduction goals. Great Plains Energy and KCP&L are still reviewing the recently finalized Clean Power Plan and have not yet determined the impacts. Compliance with the Clean Power Plan or greenhouse gas legislation 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 the Clean Power Plan is reviewed. Management will continue to monitor the progress of relevant legislation and review the Clean Power Plan. The Companies are subject to existing renewable energy standards in Missouri. Management believes that national renewable energy standards are also possible. The timing, provisions and impact of such possible future requirements, including the cost to obtain and install new equipment to achieve compliance, cannot be reasonably estimated at this time. 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 May 2014, the EPA finalized 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 are subject to the best technology available standards based on studies completed to comply with such standards. The rule provides flexibility to work with the states to develop the best technology available to minimize aquatic species impacted by being pinned against intake screens (impingement) or drawn into cooling water systems (entrainment). Estimated costs to comply with Section 316(b) of the Clean Water Act are included in the estimated capital expenditures table above. 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 other technology to cool the water, 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 would set 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 September 2015. The proposal includes a variety of options to reduce pollutants that are discharged into waterways from 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. Estimated capital costs to comply with the proposed rule are included in the estimated capital expenditures table above. Solid Waste Solid and hazardous waste generation, storage, transportation, treatment and disposal are regulated at the federal and state levels under various laws and regulations. In December 2014, the EPA finalized regulations to regulate CCRs under the Resource Conservation and Recovery Act (RCRA) subtitle D to address the risks from the disposal of CCRs generated from the combustion of coal at electric generating facilities. The Companies use coal in generating electricity and dispose of the CCRs in both on-site facilities and facilities owned by third parties. The rule requires periodic assessments; groundwater monitoring; location restrictions; design and operating requirements; recordkeeping and notifications; and closure, among other requirements, for CCR units. The rule was promulgated in the Federal Register on April 17, 2015, and is effective six months after promulgation with various obligations effective at specified times within the rule. Estimated capital costs to comply with the CCR rule are included in the estimated capital expenditures table above. See Note 6 for information regarding an increase in Great Plains Energy's and KCP&L's AROs as a result of the CCR rule. 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 a disposal site 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, 2015, and December 31, 2014, 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, 2015, and December 31, 2014, Great Plains Energy had $1.4 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 $1.4 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
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| Contingencies Disclosure [Text Block] | 12. 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 the 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
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| Related Party Transactions and Relationships | 13. RELATED PARTY TRANSACTIONS AND RELATIONSHIPS KCP&L employees manage GMO's business and operate its facilities at cost, including GMO's 18% ownership interest in KCP&L's Iatan Nos. 1 and 2. The operating expenses and capital costs billed from KCP&L to GMO were $46.2 million and $92.2 million, respectively, for the three months ended and year to date June 30, 2015. These costs totaled $42.6 million and $87.2 million, respectively, for the three months ended and year to date June 30, 2014. Additionally, KCP&L and GMO engage in wholesale electricity transactions with each other. KCP&L's net wholesale sales to GMO were $0.1 million and $0.2 million for the three months ended and year to date June 30, 2015, respectively. KCP&L's net wholesale sales to GMO were $0.6 million and $11.0 million for the three months ended and year to date June 30, 2014, respectively. 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 December 31, 2014, KCP&L had a money pool payable to GMO of $12.6 million. The following table summarizes KCP&L's related party net receivables.
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The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivative Instruments
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative Instruments and Hedging Activities Disclosure [Text Block] | 14. 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 wholesale sales, 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 KCP&L's Kansas jurisdiction and GMO's utility operations that are recorded to a regulatory asset or liability consistent with KCC and MPSC regulatory orders. 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, 2015, 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 arrangements, 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 uses derivative instruments to mitigate exposure to market price fluctuations for wholesale power. 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. KCP&L and GMO have Transmission Congestion Rights (TCRs) that they utilize to hedge against congestion costs and protect load prices in the Southwest Power Pool, Inc. (SPP) Integrated Marketplace, which began operations in March 2014. These financial contracts have been designated as economic hedges (non-hedging derivatives). The fair values of these instruments assigned to KCP&L's Missouri jurisdiction are recorded as derivative assets or liabilities with an offsetting entry recorded to electric revenue. The fair values of these instruments assigned to KCP&L's Kansas jurisdiction and GMO are recorded as derivative assets or liabilities with an offsetting entry recorded to a regulatory asset or liability. For KCP&L's Kansas jurisdiction and GMO, the settlement costs are included in their fuel recovery mechanisms. A regulatory asset or liability is recorded to reflect the change in the timing of recognition authorized by KCC and MPSC. Recovery of actual costs will not impact earnings, but will impact cash flows due to the timing of the recovery mechanism. GMO's risk management policy uses derivative instruments to mitigate price exposure to natural gas price volatility in the market. At June 30, 2015, GMO had financial contracts in place to hedge approximately 43%, 29% and 10% of the expected on-peak natural gas generation and natural gas equivalent purchased power price exposure for the remainder of 2015, 2016 and 2017, 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 recovery mechanism. A regulatory asset or liability is recorded to reflect the change in the timing of recognition authorized by the MPSC. Recovery of actual costs 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 gross notional contract amount 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 and balance sheet classification are summarized in the following tables. 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, 2015, and December 31, 2014, Great Plains Energy offset $2.8 million and $2.3 million, respectively, of cash collateral posted with counterparties against net derivative positions. See Note 16 for information regarding amounts reclassified out of accumulated other comprehensive loss for Great Plains Energy and KCP&L. Great Plains Energy's accumulated OCI at June 30, 2015, includes $9.2 million that is expected to be reclassified to expenses over the next twelve months. KCP&L's accumulated OCI at June 30, 2015, includes $8.8 million that is expected to be reclassified to expenses over the next twelve months. The following tables summarize the amounts of gain (loss) recognized for the change in fair value of commodity contract derivatives not designated as hedging instruments for Great Plains Energy and KCP&L.
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- Details
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- Definition
The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value Measurements
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Jun. 30, 2015
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Measurements | 15. 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. 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. 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. Great Plains Energy and KCP&L record cash and cash equivalents and short-term borrowings on the balance sheet at cost, which approximates fair value due to the short-term nature of these instruments. Great Plains Energy and KCP&L record long-term debt on the balance sheet at amortized cost. The fair value of long-term debt is measured as a Level 2 liability and is based on quoted market prices, with the incremental borrowing rate for similar debt used to determine fair value if quoted market prices are not available. At June 30, 2015, the book value and fair value of Great Plains Energy's long-term debt, including current maturities, were $3.5 billion and $3.8 billion, respectively. At December 31, 2014, the book value and fair value of Great Plains Energy's long-term debt, including current maturities, were $3.5 billion and $3.8 billion, respectively. At June 30, 2015, 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, 2014, the book value and fair value of KCP&L's long-term debt, including current maturities, were $2.3 billion and $2.6 billion, respectively. 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. The fair values below are gross values before netting arrangements and netting of cash collateral.
The following tables reconcile the beginning and ending balances for all Level 3 assets and liabilities measured at fair value on a recurring basis.
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- Definition
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)
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Jun. 30, 2015
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| Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Text Block] | 16. 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.
(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.
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- Definition
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] | 17. 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.
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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 | 18. 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, GPETHC and unallocated corporate charges. The summary of significant accounting policies applies to the reportable segment. Segment performance is evaluated based on net income. The following tables reflect summarized financial information concerning Great Plains Energy's reportable segment.
(a) Capital expenditures reflect year to date amounts for the periods presented. |
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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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| 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 significant operations are as follows:
Great Plains Energy also wholly owns GPE Transmission Holding Company, LLC (GPETHC). GPETHC owns 13.5% of Transource Energy, LLC (Transource) with the remaining 86.5% owned by AEP Transmission Holding Company, LLC (AEPTHC), a subsidiary of American Electric Power Company, Inc. GPETHC accounts for its investment in Transource under the equity method. Transource is focused on the development of competitive electric transmission projects. 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 18 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 earnings per common share (EPS), preferred stock dividend requirements 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 and restricted stock. |
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| New Accounting Pronouncements, Policy [Policy Text Block] | New Accounting Standards In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in Generally Accepted Accounting Principles (GAAP) when it becomes effective. In July 2015, the FASB approved a one year deferral of the effective date of ASU No. 2014-09. A final ASU formally amending the effective date of ASU No. 2014-09 from January 1, 2017, to January 1, 2018, is expected to be issued in the third quarter of 2015. The standard permits the use of either the retrospective or cumulative effect transition method. The Companies are evaluating the effect that ASU No. 2014-09 will have on their consolidated financial statements and related disclosures. The Companies have not yet selected a transition method nor have they determined the effect of the standard on their ongoing financial reporting. In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs, which requires that debt issuance costs related to a recognized debt liability be presented on the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. Great Plains Energy and KCP&L currently include debt issuance costs in Other - Investments and Other Assets on their consolidated balance sheets. The new guidance is to be applied retrospectively and is effective for interim and annual periods beginning after December 15, 2015, with early adoption permitted. The Companies intend to early adopt ASU No. 2015-03 for the 2015 Form 10-K. |
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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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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. No definition available.
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Summary of Significant Accounting Policies (Tables)
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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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- Definition
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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| X | ||||||||||
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- Definition
Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Supplemental Cash Flow Information (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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| Supplemental Cash Flow Elements [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] |
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| X | ||||||||||
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- Definition
Tabular disclosure of supplemental cash flow information for the periods presented. No definition available.
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| X | ||||||||||
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- Details
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Receivables (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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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.
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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, 2015
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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 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 | ||||||||||
|
- 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 | ||||||||||
|
- 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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| X | ||||||||||
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- Details
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Asset Retirement Obligations (Tables)
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6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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| Asset Retirement Obligation Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Change in Asset Retirement Obligation [Table Text Block] | The following table summarizes the change in Great Plains Energy's and KCP&L's AROs.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Pension Plans and Other Employee Benefits (Tables)
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6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Benefit Costs [Table Text Block] | The following tables provides 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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- 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, 2015
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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 |
* weighted-average |
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- Details
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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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- 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, 2015
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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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- 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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Commitments and Contingencies (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Environmental Capital Expenditures [Table Text Block] |
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| X | ||||||||||
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- Definition
Tabular disclosure of environmental expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) over the next five years to comply with environmental regulations. No definition available.
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| X | ||||||||||
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- Details
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Related Party Transactions and Relationships (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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| Related Party Transactions [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of related party receivables and payables [Table Text Block] | The following table summarizes KCP&L's related party net receivables.
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| X | ||||||||||
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Tabular disclosure of related party receivables and payables. No definition available.
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| X | ||||||||||
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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, 2015
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Values of open positions for derivative instruments [Table Text Block] | The gross notional contract amount 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 and balance sheet classification are summarized in the following tables. 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.
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| Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | The following tables summarize the amounts of gain (loss) recognized for the change in fair value of commodity contract derivatives not designated as hedging instruments for Great Plains Energy and KCP&L.
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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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- Definition
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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- Definition
Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value Measurements (Tables)
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Jun. 30, 2015
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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. The fair values below are gross values before netting arrangements and netting of cash collateral.
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| Unobservable inputs reconciliation | The following tables reconcile the beginning and ending balances for all Level 3 assets and liabilities measured at fair value on a recurring basis.
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- Definition
Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Jun. 30, 2015
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| Accumulated Other Comprehensive Income (Loss), Net of Tax [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.
(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.
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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, 2015
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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] |
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- Details
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| X | ||||||||||
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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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| X | ||||||||||
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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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Segments and Related Information (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2015
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| Segment Reporting [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Financial Information [Table Text Block] |
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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 Equity Method Investment (Details) (Transource Energy, LLC [Member])
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6 Months Ended |
|---|---|
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Jun. 30, 2015
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| Schedule of Equity Method Investments [Line Items] | |
| Equity Method Investment, Description of Principal Activities | Transource is focused on the development of competitive electric transmission projects. |
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GPE Transmission Holding Company, LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | |
| Equity Method Investment, Ownership Percentage | 13.50% |
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AEP Transmission Holding Company, LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | |
| Ownership Percentage of Majority Owner | 86.50% |
| X | ||||||||||
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- Definition
A description of the principal activities of an investee accounted for under the equity method. No definition available.
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage. 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, 2015
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Jun. 30, 2014
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Jun. 30, 2015
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Jun. 30, 2014
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| Accounting Policies [Abstract] | ||||
| Net income (loss) | $ 44.4 | $ 52.1 | $ 63.3 | $ 75.9 |
| Income [Abstract] | ||||
| Less: preferred stock dividend requirements | 0.4 | 0.4 | 0.8 | 0.8 |
| Earnings (loss) available for common shareholders | $ 44.0 | $ 51.7 | $ 62.5 | $ 75.1 |
| Common Shares Outstanding [Abstract] | ||||
| Average number of common shares outstanding (in shares) | 154.1 | 153.8 | 154.1 | 153.8 |
| Add: effect of dilutive securities (in shares) | 0.4 | 0.2 | 0.4 | 0.2 |
| Diluted average number of common shares outstanding (in shares) | 154.5 | 154.0 | 154.5 | 154.0 |
| Earnings Per Share [Abstract] | ||||
| Earnings Per Share, Basic and Diluted | $ 0.28 | $ 0.34 | $ 0.40 | $ 0.49 |
| 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
The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- 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 | ||||||||||
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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 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)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2015
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Jun. 30, 2014
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Jun. 30, 2015
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Jun. 30, 2014
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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 | 0 | 475,549 | 0 | 475,549 |
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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 | 0 | 0 | 287 |
| 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 | ||||||||||
|
- Details
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Summary of Significant Accounting Policies Subsequent Events (Details) (Subsequent Event [Member], USD $)
|
1 Months Ended |
|---|---|
|
Aug. 31, 2015
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Common Stock [Member]
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| Dividends Declared [Abstract] | |
| Dividends Payable, Date Declared, Month and Year | 2015-08 |
| Dividends Payable, Amount Per Share | $ 0.245 |
| Dividends Payable, Date to be Paid | Sep. 21, 2015 |
| Dividends Payable, Date of Record | Aug. 28, 2015 |
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Preferred Stock [Member]
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| Dividends Declared [Abstract] | |
| Dividends Payable, Date Declared, Month and Year | 2015-08 |
| Dividends Payable, Date to be Paid | Dec. 01, 2015 |
| Dividends Payable, Date of Record | Nov. 06, 2015 |
| X | ||||||||||
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- Definition
Date the declared dividend will be paid, in CCYY-MM-DD format. 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 per share amount of a dividend declared, but not paid, as of the financial reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The month and year (YYYY-MM) that the dividend to be paid was declared. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. No definition available.
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|
Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|
| Cash flows affected by changes in: | ||
| Receivables | $ (36.0) | $ (57.1) |
| Accounts receivable pledged as collateral | 8.0 | 4.0 |
| Fuel inventories | (12.2) | 3.9 |
| Materials and supplies | 0.3 | 4.1 |
| Accounts payable | (108.2) | (76.1) |
| Accrued taxes | 47.5 | 46.0 |
| Accrued interest | (1.3) | (1.3) |
| Deferred refueling outage costs | (17.7) | 8.4 |
| Pension and post-retirement benefit obligations | 25.0 | 5.3 |
| Allowance for equity funds used during construction | (3.5) | (9.0) |
| Fuel recovery mechanism | 25.6 | (17.3) |
| Solar rebates paid | (4.8) | (33.3) |
| Other operating activities | 3.9 | (5.5) |
| Total other operating activities | (73.4) | (127.9) |
| Cash paid during the period: | ||
| Interest Paid, Net | 91.9 | 88.2 |
| Income Taxes Paid | 0.2 | 0.1 |
| Non-cash investing activities: | ||
| Liabilities accrued for capital expenditures | 34.8 | 46.7 |
|
Kansas City Power and Light Company [Member]
|
||
| Cash flows affected by changes in: | ||
| Receivables | (1.4) | (34.4) |
| Fuel inventories | (11.9) | 6.6 |
| Materials and supplies | 0.1 | 2.8 |
| Accounts payable | (69.7) | (38.8) |
| Accrued taxes | 94.4 | 31.9 |
| Accrued interest | (1.5) | (1.5) |
| Deferred refueling outage costs | (17.7) | 8.4 |
| Pension and post-retirement benefit obligations | 25.1 | 4.4 |
| Allowance for equity funds used during construction | (2.7) | (8.5) |
| Fuel recovery mechanism | 0.6 | 2.4 |
| Solar rebates paid | (4.1) | (10.7) |
| Other operating activities | 3.7 | (15.8) |
| Total other operating activities | 14.9 | (53.2) |
| Cash paid during the period: | ||
| Interest Paid, Net | 61.2 | 57.2 |
| Non-cash investing activities: | ||
| Liabilities accrued for capital expenditures | $ 31.4 | $ 39.3 |
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- Definition
The increase (decrease) in deferred refueling outage costs. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of cash paid to customers during the current period for solar rebates. 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 | ||||||||||
|
- Definition
Future cash outflow to pay for construction in progress expenditures that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes. No definition available.
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- Details
|
|
Receivables (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | $ 0 | $ 0 | $ 0 | $ 0 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (0.6) | [1] | (0.7) | [1] | (0.5) | [1] | (0.6) | [1] | ||
| Servicing fees received (paid) | 0 | 0 | 0 | 0 | ||||||
| Fees paid to outside investor | (0.3) | (0.4) | (0.6) | (0.9) | ||||||
| Cash from customers (transferred) received | 0 | 0 | 0 | 0 | ||||||
| Cash received from (paid for) receivables purchased | 0 | 0 | 0 | 0 | ||||||
| Interest on intercompany note received (paid) | 0 | 0 | 0 | 0 | ||||||
|
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] | (0.4) | [1] | (0.3) | [1] | (0.3) | [1] | ||
| Servicing fees received (paid) | 0 | 0 | 0 | 0 | ||||||
| Fees paid to outside investor | (0.2) | (0.3) | (0.4) | (0.6) | ||||||
| Cash from customers (transferred) received | 0 | 0 | 0 | 0 | ||||||
| Cash received from (paid for) receivables purchased | 0 | 0 | 0 | 0 | ||||||
| Interest on intercompany note received (paid) | 0 | 0 | 0 | 0 | ||||||
|
Kansas City Power And Light Company Unconsolidated [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | (388.7) | (380.9) | (738.5) | (734.0) | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (4.9) | [1] | (4.8) | [1] | (9.3) | [1] | (9.3) | [1] | ||
| Servicing fees received (paid) | 0.6 | 0.6 | 1.2 | 1.2 | ||||||
| Fees paid to outside investor | 0 | 0 | 0 | 0 | ||||||
| Cash from customers (transferred) received | (356.3) | (348.2) | (716.1) | (715.8) | ||||||
| Cash received from (paid for) receivables purchased | 351.8 | 343.8 | 707.1 | 706.8 | ||||||
| Interest on intercompany note received (paid) | 0 | 0.1 | 0.1 | 0.1 | ||||||
|
KCPL Receivables Company [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | 388.7 | 380.9 | 738.5 | 734.0 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | 4.5 | [1] | 4.4 | [1] | 9.0 | [1] | 9.0 | [1] | ||
| Servicing fees received (paid) | (0.6) | (0.6) | (1.2) | (1.2) | ||||||
| Fees paid to outside investor | (0.2) | (0.3) | (0.4) | (0.6) | ||||||
| Cash from customers (transferred) received | 356.3 | 348.2 | 716.1 | 715.8 | ||||||
| Cash received from (paid for) receivables purchased | (351.8) | (343.8) | (707.1) | (706.8) | ||||||
| Interest on intercompany note received (paid) | 0 | (0.1) | (0.1) | (0.1) | ||||||
|
KCPL Greater Missouri Operations [Member]
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | (200.6) | (197.9) | (389.3) | (391.7) | ||||||
| Gain (Loss) on Sale of Accounts Receivable | (2.5) | [1] | (2.5) | [1] | (4.9) | [1] | (5.0) | [1] | ||
| Servicing fees received (paid) | 0.3 | 0.3 | 0.6 | 0.6 | ||||||
| Fees paid to outside investor | 0 | 0 | 0 | 0 | ||||||
| Cash from customers (transferred) received | (183.5) | (176.5) | (378.3) | (377.3) | ||||||
| Cash received from (paid for) receivables purchased | 181.3 | 174.3 | 373.6 | 372.6 | ||||||
| Interest on intercompany note received (paid) | 0.1 | 0 | 0.1 | 0 | ||||||
|
GMO Receivables Company Member
|
||||||||||
| Accounts Receivable Sold [Line Items] | ||||||||||
| Receivables (sold) purchased | 200.6 | 197.9 | 389.3 | 391.7 | ||||||
| Gain (Loss) on Sale of Accounts Receivable | 2.3 | [1] | 2.2 | [1] | 4.7 | [1] | 4.7 | [1] | ||
| Servicing fees received (paid) | (0.3) | (0.3) | (0.6) | (0.6) | ||||||
| Fees paid to outside investor | (0.1) | (0.1) | (0.2) | (0.3) | ||||||
| Cash from customers (transferred) received | 183.5 | 176.5 | 378.3 | 377.3 | ||||||
| Cash received from (paid for) receivables purchased | (181.3) | (174.3) | (373.6) | (372.6) | ||||||
| Interest on intercompany note received (paid) | $ (0.1) | $ 0 | $ (0.1) | $ 0 | ||||||
|
||||||||||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of intercompany interest received (paid) on intercompany notes related to the sale of accounts receivable. No definition available.
|
| X | ||||||||||
|
- Definition
Cash proceeds from customers in accounts receivable received (transferred). No definition available.
|
| X | ||||||||||
|
- Definition
Receivables (sold) to wholly owned subsidiary receivables company or purchased by parent company. No definition available.
|
| X | ||||||||||
|
- Definition
Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Cash Flows between a transferee and a transferor attributable to servicing fees related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). 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
|
| X | ||||||||||
|
- Definition
The amount of cash paid during the current period for fees which are not defined elsewhere in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Receivables Accounts, Notes, and Financing (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Other Receivables, Gross, Current | $ 75.1 | $ 86.7 |
| Receivables, net | 196.2 | 160.3 |
|
Kansas City Power and Light Company [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Other Receivables, Gross, Current | 69.3 | 79.8 |
| Receivables, net | 144.9 | 128.9 |
|
Trade Accounts Receivable [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Allowance for doubtful accounts | (5.3) | (2.8) |
|
Trade Accounts Receivable [Member] | Kansas City Power and Light Company [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Allowance for doubtful accounts | (2.8) | (1.2) |
|
Trade Accounts Receivable [Member] | Billed Revenues [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | 3.2 | 1.1 |
|
Trade Accounts Receivable [Member] | Billed Revenues [Member] | Kansas City Power and Light Company [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | 1.1 | 0.6 |
|
Trade Accounts Receivable [Member] | Unbilled Revenues [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | 123.2 | 75.3 |
|
Trade Accounts Receivable [Member] | Unbilled Revenues [Member] | Kansas City Power and Light Company [Member]
|
||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Accounts Receivable, Gross, Current | $ 77.3 | $ 49.7 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- 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
|
|
Receivables Narrative (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2015
|
Dec. 31, 2014
|
|
| Accounts receivable pledged as collateral | $ 163.0 | $ 171.0 |
| Collateralized note payable | 163.0 | 171.0 |
|
Kansas City Power and Light Company [Member]
|
||
| Accounts receivable pledged as collateral | 110.0 | 110.0 |
| Collateralized note payable | 110.0 | 110.0 |
| Contractually Specified Servicing Fees Percentage Amount | 1.50% | |
| Maximum amount of outstanding principal under receivables agreement | 110 | |
|
KCPL Greater Missouri Operations [Member]
|
||
| Contractually Specified Servicing Fees Percentage Amount | 1.50% | |
| Maximum amount of outstanding principal under receivables agreement from mid-June 2015 through September 2015 | 80 | |
| Maximum amount of outstanding principal under receivables agreement from mid-November 2014 to mid-June 2015 | $ 65 |
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- Definition
Maximum amount of outstanding principal under receivables agreement No definition available.
|
| X | ||||||||||
|
- Definition
Maximum amount of outstanding principal under receivables agreement from mid-June 2015 to September 2015. No definition available.
|
| X | ||||||||||
|
- Definition
Maximum amount of outstanding principal under receivables agreement from mid-November 2014 to mid-June 2015. No definition available.
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
|
Nuclear Plant (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | $ 149.3 | $ 149.3 | $ 145.4 | |||
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 55.0 | 55.0 | 54.4 | |||
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1.0) | (1.0) | (0.8) | |||
| Fair Value, Nuclear decommissioning trust fund | 203.3 | 203.3 | 199.0 | 183.9 | ||
| Weighted average maturity of debt securities (in years) | 7 years 0 months | |||||
| Realized gains on investments in decommissioning trust fund | 1.2 | 0.5 | 2.6 | 0.7 | ||
| Realized losses on investments in decommissioning trust fund | (1.2) | (0.5) | (1.8) | (0.6) | ||
|
Equity Securities [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | 88.5 | 88.5 | 87.2 | |||
| Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 52.2 | 52.2 | 50.6 | |||
| Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (0.6) | (0.6) | (0.7) | |||
| Fair Value, Nuclear decommissioning trust fund | 140.1 | 140.1 | 137.1 | |||
|
Debt Securities [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | 57.9 | 57.9 | 55.4 | |||
| Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 2.8 | 2.8 | 3.8 | |||
| Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.4) | (0.4) | (0.1) | |||
| Fair Value, Nuclear decommissioning trust fund | 60.3 | 60.3 | 59.1 | |||
|
Other Securities [Member]
|
||||||
| Investments in decommissioning trust fund [Line Items] | ||||||
| Cost Basis | 2.9 | 2.9 | 2.8 | |||
| Fair Value, Nuclear decommissioning trust fund | $ 2.9 | $ 2.9 | $ 2.8 | |||
| 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
Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| 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
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, 2015
|
Dec. 31, 2014
|
|
| Nuclear decommissioning trust fund [Roll Forward] | ||
| Nuclear decommissioning trust fund, beginning balance | $ 199.0 | $ 183.9 |
| Contributions to nuclear decommissioning trust fund | 1.6 | 3.3 |
| Earned income, net of fees | 1.5 | 3.6 |
| Net realized gains (losses) on nuclear decommissioning trust fund | 0.8 | 0.4 |
| Net unrealized gains (losses) on nuclear decommissioning trust fund | 0.4 | 7.8 |
| Nuclear decommissioning trust fund, ending balance | 203.3 | 199.0 |
|
Wolf Creek [Member]
|
||
| Jointly Owned Utility Plant Interests [Line Items] | ||
| Ownership percentage in Wolf Creek, a nuclear generating unit (in hundredths) | 47.00% | |
|
Kansas City Power and Light Company [Member]
|
||
| Nuclear decommissioning trust fund [Roll Forward] | ||
| Nuclear decommissioning trust fund, beginning balance | 199.0 | 183.9 |
| Contributions to nuclear decommissioning trust fund | 1.6 | 3.3 |
| Earned income, net of fees | 1.5 | 3.6 |
| Net realized gains (losses) on nuclear decommissioning trust fund | 0.8 | 0.4 |
| Net unrealized gains (losses) on nuclear decommissioning trust fund | 0.4 | 7.8 |
| Nuclear decommissioning trust fund, ending balance | $ 203.3 | $ 199.0 |
|
Kansas City Power and Light Company [Member] | Wolf Creek [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
|
|
Regulatory Matters (Details) (Kansas City Power and Light Company [Member], USD $)
In Millions, unless otherwise specified |
1 Months Ended | ||
|---|---|---|---|
|
Oct. 31, 2014
Missouri Public Service Commission [Member]
|
May 31, 2015
Kansas Corporation Commission [Member]
|
Jan. 31, 2015
Kansas Corporation Commission [Member]
|
|
| Regulatory Proceedings [Line Items] | |||
| Annual revenue increase, requested | $ 120.9 | $ 67.3 | |
| Return on equity, requested (in hundredths) | 10.30% | 10.30% | |
| Rate-making equity ratio, requested (in hundredths) | 50.36% | 50.48% | |
| Commission Staff Recommended Return On Equity Percentage | 9.25% | ||
| Commission Staff Recommended Rate Increase (Decrease) Amount | $ 44.0 | ||
| X | ||||||||||
|
- Definition
Amount of rate increase (decrease) recommended by staff of the state commission. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of return on equity recommended by staff of the state commission. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Percentage of public utility's requested equity to capital, including debt and equity. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of public utility's requested rate increase (decrease) with regulatory agency. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of public utility's requested return on equity. No definition available.
|
|
Regulatory Matters Subsequent Events (Details) (Kansas City Power and Light Company [Member], USD $)
In Millions, unless otherwise specified |
1 Months Ended | |||||
|---|---|---|---|---|---|---|
|
May 31, 2015
Kansas Corporation Commission [Member]
|
Jan. 31, 2015
Kansas Corporation Commission [Member]
|
Oct. 31, 2014
Missouri Public Service Commission [Member]
|
Jul. 31, 2015
Missouri Public Service Commission [Member]
Subsequent Event [Member]
|
Jul. 31, 2015
Missouri Public Service Commission [Member]
Subsequent Event [Member]
Maximum [Member]
|
Jul. 31, 2015
Missouri Public Service Commission [Member]
Subsequent Event [Member]
Minimum [Member]
|
|
| Subsequent Event [Line Items] | ||||||
| Annual revenue increase, requested | $ 67.3 | $ 120.9 | $ 112.7 | |||
| Return on equity, requested (in hundredths) | 10.30% | 10.30% | 10.30% | |||
| Rate-making equity ratio, requested (in hundredths) | 50.48% | 50.36% | ||||
| Staff recommended annual revenue increase | $ 44.0 | $ 87.3 | $ 76.8 | |||
| Commission Staff Recommended Return On Equity Percentage | 9.25% | 9.50% | 9.00% | |||
| X | ||||||||||
|
- Definition
Amount of rate increase (decrease) recommended by staff of the state commission. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of return on equity recommended by staff of the state commission. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of public utility's requested equity to capital, including debt and equity. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of public utility's requested rate increase (decrease) with regulatory agency. No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of public utility's requested return on equity. No definition available.
|
| X | ||||||||||
|
- Details
|
|
Asset Retirement Obligations (Details) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | 6 Months Ended | 12 Months Ended |
|---|---|---|---|
|
Apr. 17, 2015
|
Jun. 30, 2015
|
Dec. 31, 2014
|
|
| Increase in asset retirement obligations due to CCR regulations | $ 69.5 | ||
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |||
| Asset Retirement Obligation, Beginning Balance | 195.9 | 158.8 | |
| Additions | 54.5 | 0 | |
| Revision in timing and/or estimates | 15.0 | 26.8 | |
| Accretion | 6.1 | 10.3 | |
| Asset Retirement Obligation, Ending Balance | 271.5 | 195.9 | |
| Asset Retirement Obligations, Liability Not Recognized | certain wiring used in Great Plains Energy's and KCP&L's generating stations include asbestos insulation, which would require special handling if disturbed. Due to the inability to reasonably estimate the quantities or the amount of disturbance that will be necessary during dismantlement at the end of the life of a plant, the fair value of this ARO cannot be reasonably estimated at this time. Management will continue to monitor the obligation and will recognize a liability in the period in which sufficient information becomes available to reasonably estimate its fair value. | ||
|
Kansas City Power and Light Company [Member]
|
|||
| Asset Retirement Obligations, Description | KCP&L has AROs related to decommissioning Wolf Creek, site remediation of its Spearville Wind Energy Facilities, asbestos abatement, removal of storage tanks and closure of ponds and landfills containing coal combustion residuals (CCRs). | ||
| Increase in asset retirement obligations due to CCR regulations | 51.3 | ||
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |||
| Asset Retirement Obligation, Beginning Balance | 177.7 | 141.7 | |
| Additions | 34.6 | 0 | |
| Revision in timing and/or estimates | 16.7 | 26.8 | |
| Accretion | 5.6 | 9.2 | |
| Asset Retirement Obligation, Ending Balance | $ 234.6 | $ 177.7 | |
|
KCPL Greater Missouri Operations [Member]
|
|||
| Asset Retirement Obligations, Description | GMO has AROs related to asbestos abatement, removal of storage tanks and closure of ponds and landfills containing CCRs. |
| X | ||||||||||
|
- Definition
Total increase in asset retirement obligations (ARO's) due to Coal Combustion Residual (CCR) regulations enacted by the EPA. The increase includes both newly created ARO's and revisions to existing ARO's No definition available.
|
| X | ||||||||||
|
- Definition
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
|
| X | ||||||||||
|
- Definition
Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of asset retirement obligations incurred during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
A general description of the asset retirement obligations and the associated long-lived assets. Description may include the terms of the legal restriction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Description of an asset retirement obligation for which a liability has not been recognized because fair value cannot be reasonably estimated and the reasons why fair value cannot be reasonably estimated. 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, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|
|
Pension Plans, Defined Benefit [Member]
|
||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Defined Benefit Plan, Contributions by Employer | $ 36.3 | |||
| Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 42.6 | |||
| Components of net periodic benefit costs [Abstract] | ||||
| Defined Benefit Plan, Service Cost | 11.3 | 9.0 | 22.6 | 18.1 |
| Defined Benefit Plan, Interest Cost | 12.6 | 12.7 | 25.2 | 25.4 |
| Defined Benefit Plan, Expected Return on Plan Assets | (12.9) | (12.7) | (25.8) | (25.4) |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0.2 | 0.2 | 0.4 | 0.4 |
| Defined Benefit Plan, Amortization of (Gains) Losses | 12.8 | 12.4 | 25.6 | 24.8 |
| Defined Benefit Plan, Amortization of Transition Obligations (Assets) | 0 | 0 | 0 | 0 |
| Net periodic benefit costs before regulatory adjustment | 24.0 | 21.6 | 48.0 | 43.3 |
| Defined benefit plan, regulatory adjustment | (2.6) | (0.4) | (5.8) | (0.8) |
| Defined Benefit Plan, Net Periodic Benefit Cost | 21.4 | 21.2 | 42.2 | 42.5 |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 10.2 | |||
| Components of net periodic benefit costs [Abstract] | ||||
| Defined Benefit Plan, Service Cost | 0.9 | 0.9 | 1.7 | 1.8 |
| Defined Benefit Plan, Interest Cost | 1.7 | 2.0 | 3.4 | 4.0 |
| Defined Benefit Plan, Expected Return on Plan Assets | (0.8) | (0.7) | (1.5) | (1.4) |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0.8 | 0.8 | 1.6 | 1.6 |
| Defined Benefit Plan, Amortization of (Gains) Losses | 0.1 | 0 | 0.1 | 0 |
| Defined Benefit Plan, Amortization of Transition Obligations (Assets) | 0 | 0.1 | 0 | 0.1 |
| Net periodic benefit costs before regulatory adjustment | 2.7 | 3.1 | 5.3 | 6.1 |
| Defined benefit plan, regulatory adjustment | 1.4 | 1.1 | 2.8 | 2.2 |
| Defined Benefit Plan, Net Periodic Benefit Cost | $ 4.1 | $ 4.2 | $ 8.1 | $ 8.3 |
|
Wolf Creek [Member]
|
||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Jointly Owned Utility Plant, Proportionate Ownership Share | 47.00% | 47.00% | ||
|
Wolf Creek [Member] | Kansas City Power and Light Company [Member]
|
||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Jointly Owned Utility Plant, Proportionate Ownership Share | 47.00% | 47.00% | ||
| 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 | ||||||||||
|
- 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 | ||||||||||
|
- 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
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
Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. No definition available.
|
| X | ||||||||||
|
- Definition
The proportionate share of interest (percent) in a jointly owned utility plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Equity Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Equity compensation expense | $ 1.1 | $ 1.0 | $ 0.9 | $ 5.4 | ||||
| Income tax benefit | 0.3 | 0.3 | 0.3 | 2.0 | ||||
|
Performance Shares [Member]
|
||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Expected volatility | 16.00% | |||||||
| Expected dividend yield | 3.72% | |||||||
| Risk-free interest rate | 1.02% | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] | ||||||||
| Beginning balance (in shares) | 534,016 | |||||||
| Granted (in shares) | 0 | 0 | 228,049 | |||||
| Earned (in shares) | (25,844) | |||||||
| Performance adjustment (in shares) | (77,515) | |||||||
| Ending balance (in shares) | 658,706 | 658,706 | ||||||
| Weighted average beginning balance (in dollars per share) | $ 25.11 | [1] | ||||||
| Weighted average granted (in dollars per share) | $ 24.06 | [1] | $ 28.78 | |||||
| Weighted average earned (in dollars per share) | $ 19.48 | [1] | ||||||
| Weighted average performance adjustment (in dollars per share) | $ 19.48 | [1] | ||||||
| Weighted average ending balance (in dollars per share) | $ 25.63 | [1] | $ 25.63 | [1] | ||||
| Total unrecognized compensation expense | 8.9 | 8.9 | ||||||
| Remaining weighted-average contractual term (in years) | 1 year 6 months | |||||||
| Fair value of performance shares earned and paid | 0.5 | 2.8 | ||||||
|
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) | 267,390 | |||||||
| Granted (in shares) | 0 | 77,937 | ||||||
| Vested (in shares) | (103,861) | |||||||
| Ending balance (in shares) | 241,466 | 241,466 | ||||||
| Weighted average beginning balance (in dollars per share) | $ 22.31 | [1] | ||||||
| Weighted average granted (in dollars per share) | $ 25.54 | $ 26.18 | [1] | $ 25.72 | ||||
| Weighted average vested (in dollars per share) | $ 19.77 | [1] | ||||||
| Weighted average ending balance (in dollars per share) | $ 24.65 | [1] | $ 24.65 | [1] | ||||
| Total unrecognized compensation expense | 3.2 | 3.2 | ||||||
| Total fair value of shares vested | 0.1 | 0.2 | 2.0 | 1.5 | ||||
| Remaining weighted-average contractual term (in years) | 1 year 8 months | |||||||
|
Kansas City Power and Light Company [Member]
|
||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Equity compensation expense | 0.7 | 0.7 | 0.6 | 3.8 | ||||
| Income tax benefit | $ 0.2 | $ 0.3 | $ 0.2 | $ 1.4 | ||||
|
||||||||
| 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
Unrecognized cost of unvested share-based compensation awards. 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 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
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. 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 $)
|
1 Months Ended | 6 Months Ended | |
|---|---|---|---|
|
May 31, 2015
|
Jun. 30, 2015
|
Dec. 31, 2014
|
|
| Short-term Debt [Line Items] | |||
| Amount of outstanding cash borrowings | $ 11,000,000 | $ 4,000,000 | |
| Commercial paper outstanding | 629,300,000 | 358,300,000 | |
|
Parent Company [Member] | Revolving Credit Facility [Member]
|
|||
| Short-term Debt [Line Items] | |||
| Amount of revolving credit facility | 200,000,000 | ||
| Revolving credit facility expiration date | Oct. 31, 2019 | ||
| Maximum borrowing capacity with transfer of unused commitments | 400,000,000 | ||
| Line of Credit Facility, Covenant Terms | 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. | ||
| Line of Credit Facility, Covenant Compliance | in compliance | ||
| Amount of outstanding cash borrowings | 11,000,000 | 4,000,000 | |
| Weighted-average interest rate from outstanding borrowings | 1.69% | 1.69% | |
| Amount of letters of credit outstanding | 200,000 | 0 | |
|
Kansas City Power and Light Company [Member]
|
|||
| Short-term Debt [Line Items] | |||
| Commercial paper outstanding | 484,000,000 | 358,300,000 | |
| Weighted-average interest rate from outstanding borrowings | 0.49% | 0.48% | |
|
Kansas City Power and Light Company [Member] | Revolving Credit Facility [Member]
|
|||
| Short-term Debt [Line Items] | |||
| Amount of revolving credit facility | 600,000,000 | ||
| Revolving credit facility expiration date | Oct. 31, 2019 | ||
| Maximum transfer of unused commitments | 200,000,000 | ||
| Line Of Credit Facility Transfer Unused Commitments | 200,000,000 | ||
| Line of Credit Facility, Covenant Terms | 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. | ||
| Line of Credit Facility, Covenant Compliance | in compliance | ||
| Amount of outstanding cash borrowings | 0 | 0 | |
| Amount of letters of credit outstanding | 2,700,000 | 2,700,000 | |
|
KCPL Greater Missouri Operations [Member]
|
|||
| Short-term Debt [Line Items] | |||
| Commercial paper outstanding | 145,300,000 | 0 | |
| Weighted-average interest rate from outstanding borrowings | 0.45% | ||
|
KCPL Greater Missouri Operations [Member] | Revolving Credit Facility [Member]
|
|||
| Short-term Debt [Line Items] | |||
| Amount of revolving credit facility | 450,000,000 | ||
| Revolving credit facility expiration date | Oct. 31, 2019 | ||
| Maximum transfer of unused commitments | 200,000,000 | ||
| Line Of Credit Facility Transfer Unused Commitments | (50,000,000) | ||
| Line of Credit Facility, Covenant Terms | A default by GMO 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, 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. | ||
| Line of Credit Facility, Covenant Compliance | in compliance | ||
| Amount of outstanding cash borrowings | 0 | 0 | |
| Amount of letters of credit outstanding | $ 3,000,000 | $ 3,200,000 |
| X | ||||||||||
|
- Definition
The maximum amount of lending capacity under Great Plains Energy's credit facility if unused commitments are transferred between that credit facility and the credit facilities of KCPL and GMO No definition available.
|
| X | ||||||||||
|
- Definition
The maximum amount of unused commitments that can be transferred between the entity's revolving credit facility and Great Plains Energy's revolving credit facility. No definition available.
|
| X | ||||||||||
|
- Definition
Transfer Of Unused Commitments Between The Entity's Revolving Credit Facility And Great Plains Energy's Revolving Credit Facility 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
Description of the conditions for borrowing under the credit facility including the nature of any restrictions. 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
Weighted average interest rate of short-term debt outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Dec. 31, 2014
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
|
Jun. 30, 2014
Kansas City Power and Light Company [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Secured Debt [Member]
General Mortgage Bonds EIRR due 2017-2035 [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Secured Debt [Member]
General Mortgage Bonds EIRR due 2017-2035 [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Secured Debt [Member]
General Mortgage bonds Series 2009A due 2019 [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Secured Debt [Member]
General Mortgage bonds Series 2009A due 2019 [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Secured Debt [Member]
General Mortgage bonds EIRR series 2005 due 2035 [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Secured Debt [Member]
General Mortgage bonds EIRR series 2005 due 2035 [Member]
|
Mar. 31, 2015
Kansas City Power and Light Company [Member]
Secured Debt [Member]
Secured EIRR Bonds Series 2005 [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior notes due 2017 KCPL [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior notes due 2017 KCPL [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior notes due 2018 KCPL [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior notes due 2018 KCPL [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior Notes due 2023 KCPL [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior Notes due 2023 KCPL [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior notes due 2035 KCPL [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior notes due 2035 KCPL [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior Notes Due 2041 KCPL [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Senior Notes [Member]
Senior Notes Due 2041 KCPL [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Unsecured Debt [Member]
EIRR Bonds Series 2007A and 2007B due 2035 [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Unsecured Debt [Member]
EIRR Bonds Series 2007A and 2007B due 2035 [Member]
|
Jun. 30, 2015
Kansas City Power and Light Company [Member]
Unsecured Debt [Member]
EIRR bonds 2.875 percent Series 2008 [Member]
|
Dec. 31, 2014
Kansas City Power and Light Company [Member]
Unsecured Debt [Member]
EIRR bonds 2.875 percent Series 2008 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Secured Debt [Member]
First Mortgage Bonds due through 2021 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Secured Debt [Member]
First Mortgage Bonds due through 2021 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior notes 8.27 percent series due 2021 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior notes 8.27 percent series due 2021 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior Notes Series A due 2025 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior Notes Series A due 2025 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior Notes Series B due 2033 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior Notes Series B due 2033 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior Notes Series C due 2043 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Senior Notes [Member]
Senior Notes Series C due 2043 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Medium-term Notes [Member]
Medium term notes 7.33 percent series due 2023 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Medium-term Notes [Member]
Medium term notes 7.33 percent series due 2023 [Member]
|
Jun. 30, 2015
KCPL Greater Missouri Operations [Member]
Medium-term Notes [Member]
Medium term notes 7.17 percent series due 2023 [Member]
|
Dec. 31, 2014
KCPL Greater Missouri Operations [Member]
Medium-term Notes [Member]
Medium term notes 7.17 percent series due 2023 [Member]
|
Jun. 30, 2015
Parent Company [Member]
Senior Notes [Member]
Senior notes due 2017 [Member]
|
Dec. 31, 2014
Parent Company [Member]
Senior Notes [Member]
Senior notes due 2017 [Member]
|
Jun. 30, 2015
Parent Company [Member]
Senior Notes [Member]
Senior Notes Due 2021 [Member]
|
Dec. 31, 2014
Parent Company [Member]
Senior Notes [Member]
Senior Notes Due 2021 [Member]
|
Jun. 30, 2015
Parent Company [Member]
Senior Notes [Member]
Senior Notes Due 2022 [Member]
|
Dec. 31, 2014
Parent Company [Member]
Senior Notes [Member]
Senior Notes Due 2022 [Member]
|
Jun. 30, 2015
Other Consolidated Entities [Member]
|
Dec. 31, 2014
Other Consolidated Entities [Member]
|
|||||||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal outstanding | $ 132.4 | [1] | $ 146.4 | [1] | $ 400.0 | [2] | $ 400.0 | [2] | $ 50.0 | $ 50.0 | $ 250.0 | [2] | $ 250.0 | [2] | $ 350.0 | [2] | $ 350.0 | [2] | $ 300.0 | $ 300.0 | $ 250.0 | [2] | $ 250.0 | [2] | $ 400.0 | $ 400.0 | $ 146.5 | [3] | $ 146.5 | [3] | $ 23.4 | $ 23.4 | $ 6.8 | $ 7.9 | $ 80.9 | $ 80.9 | $ 125.0 | $ 125.0 | $ 75.0 | $ 75.0 | $ 150.0 | $ 150.0 | $ 3.0 | $ 3.0 | $ 7.0 | $ 7.0 | $ 100.0 | [2] | $ 100.0 | [2] | $ 350.0 | $ 350.0 | $ 287.5 | $ 287.5 | |||||||||||||||
| Debt Instrument, Maturity Date | Dec. 31, 2019 | Dec. 31, 2035 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2023 | Dec. 31, 2035 | Dec. 31, 2041 | Dec. 31, 2035 | Dec. 31, 2038 | Dec. 31, 2021 | Dec. 31, 2025 | Dec. 31, 2033 | Dec. 31, 2043 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2022 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Current maturities | (1.1) | (15.1) | 0 | (14.0) | (1.1) | (1.1) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unamortized discount | (3.7) | (3.8) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unarmortized discount and premium, net | 4.0 | 4.3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term debt excluding current maturities | 3,486.7 | 3,488.0 | 2,298.6 | 2,298.5 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument Maturity Date Range Start | Dec. 31, 2017 | Dec. 31, 2016 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument Maturity Date Range End | Dec. 31, 2035 | Dec. 31, 2021 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rates (in hundredths) | 7.15% | 4.65% | 5.85% | 6.375% | 3.15% | 6.05% | 5.30% | 2.875% | 9.44% | 8.27% | 3.49% | 4.06% | 4.74% | 7.33% | 7.17% | 6.875% | 4.85% | 5.292% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term Debt, Weighted Average Interest Rate | 2.83% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Variable rate (in hundredths) | 0.08% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) | 8.59% | 5.72% | 7.49% | 5.78% | 7.33% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Repayments of Long-term Debt | $ 15.1 | $ 13.4 | $ 14.0 | $ 0 | $ 14.0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
|
- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Contractual interest rate for funds borrowed, under the 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
Amount of long-term debt, after 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
Weighted average interest rate of long-term debt outstanding. No definition available.
|
| 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
|
|
Commitments and Contingencies Environmental Matters (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2015
MW
T
|
Dec. 31, 2014
|
|
| Estimated Environmental Capital Expenditures [Abstract] | ||
| Estimate Of Environmental Capital Expenditures Current | $ 119.1 | |
| Estimate Of Environmental Capital Expenditures In Two Years | 62.2 | |
| Estimate Of Environmental Capital Expenditures In Three Years | 158.4 | |
| Estimate Of Environmental Capital Expenditures In Four Years | 103.4 | |
| Estimate Of Environmental Capital Expenditures In Five Years | 99.9 | |
| 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) | 22,000,000 | |
| EPA nationwide CO2 emission reductions by 2030 | 32.00% | |
| Remediation [Abstract] | ||
| Accrued environmental remediation expenses | 1.4 | 1.4 |
|
MISSOURI
|
||
| Climate Change [Abstract] | ||
| EPA Interim Co2 Goal Rate Reduction | 26.00% | |
| EPA Co2 Emission Reductions By 2030 By State | 37.00% | |
|
KANSAS
|
||
| Climate Change [Abstract] | ||
| EPA Interim Co2 Goal Rate Reduction | 34.00% | |
| EPA Co2 Emission Reductions By 2030 By State | 44.00% | |
|
LaCygne Station [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Predetermination request for environmental equipment required at LaCygne Station to comply with BART | 1,230 | |
| Final expected amount below predetermination request for environmental upgrades at LaCynge Station to comply with BART | 75 | |
|
Kansas City Power and Light Company [Member]
|
||
| Estimated Environmental Capital Expenditures [Abstract] | ||
| Estimate Of Environmental Capital Expenditures Current | 104.5 | |
| Estimate Of Environmental Capital Expenditures In Two Years | 51.5 | |
| Estimate Of Environmental Capital Expenditures In Three Years | 132.9 | |
| Estimate Of Environmental Capital Expenditures In Four Years | 86.9 | |
| Estimate Of Environmental Capital Expenditures In Five Years | 84.3 | |
| Climate Change [Abstract] | ||
| CO2 produced per year (in tons) | 17,000,000 | |
| Remediation [Abstract] | ||
| Accrued environmental remediation expenses | 0.3 | 0.3 |
|
Kansas City Power and Light Company [Member] | LaCygne Station [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Predetermination request for environmental equipment required at LaCygne Station to comply with BART | 615 | |
| Entity's ownership percentage in facility (in hundredths) | 50.00% | |
| Cash capital expenditures for La Cygne environmental project | 524 | |
|
KCPL Greater Missouri Operations [Member]
|
||
| Remediation [Abstract] | ||
| Estimated amount of insurance proceeds available to cover qualified remediation expenses | $ 1.4 | |
|
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% | |
|
KCPL Greater Missouri Operations [Member] | Iatan No. 1 [Member]
|
||
| Best Available Retrofit Technology Rule [Abstract] | ||
| Entity's ownership percentage in facility (in hundredths) | 18.00% |
| 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 for 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 | ||||||||||
|
- Definition
Targeted reduction by state in CO2 emissions from the power sector by 2030 from 2012 emission levels as adjusted by the EPA as part of the EPA's Clean Power Plan. No definition available.
|
| X | ||||||||||
|
- Definition
Targeted nationwide reductions in CO2 emissions from the power sector by 2030 from 2005 emission levels as part of the EPA's Clean Power Plan. No definition available.
|
| X | ||||||||||
|
- Definition
The interim CO2 goal rate reduction (average of years 2022-2029) from 2012 CO2 emissions as adjusted by the EPA as part of the EPA's Clean Power Plan. 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 | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Represents the estimated number of tons of CO2 produced each year based on current generation capacity. No definition available.
|
| X | ||||||||||
|
- Definition
Current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) to comply with environmental regulations in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) to comply with environmental regulations in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) to comply with environmental regulations in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) to comply with environmental regulations in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Current estimate of capital expenditures (exclusive of Allowance for Funds Used During Construction and property taxes) to comply with environmental regulations in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
|
| X | ||||||||||
|
- Definition
Final expected amount below predetermination request for environmental upgrades at LaCygne Station to comply with BART No definition available.
|
| X | ||||||||||
|
- Details
|
| 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 | ||||||||||
|
- 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
Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. 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
|
|
Legal Proceedings Loss Contingencies (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2015
|
|
| 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 |
|
Unfavorable Regulatory Action [Member]
|
|
| Loss Contingencies [Line Items] | |
| Loss Contingency, Inestimable Loss | Due to the uncertainties remaining in the case, the potential refund or range of potential refunds owed by MPS Merchant are not reasonably estimable |
| X | ||||||||||
|
- Definition
Estimated additional refunds entitled to receive. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of judgment or settlement awarded to (against) the entity in respect of litigation. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Explanation as to why an estimate of a specified contingent loss cannot be made, resulting in disclosure without accrual. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Related Party Transactions and Relationships (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Dec. 31, 2014
|
|
|
Kansas City Power and Light Company [Member] | KCPL Greater Missouri Operations [Member]
|
|||||
| Related Party Transaction [Line Items] | |||||
| Related Party Transaction, Due from (to) Related Party, Current | $ 33.8 | $ 33.8 | $ 38.2 | ||
| KCPL employees manage GMO's business and operate its facilities at cost | 46.2 | 42.6 | 92.2 | 87.2 | |
| KCPL net wholesale sales to GMO | 0.1 | 0.6 | 0.2 | 11.0 | |
|
Kansas City Power and Light Company [Member] | KCPL Greater Missouri Operations [Member] | Money Pool [Member]
|
|||||
| Related Party Transaction [Line Items] | |||||
| Payable to Related Party | 12.6 | ||||
|
Kansas City Power and Light Company [Member] | Great Plains Energy [Member]
|
|||||
| Related Party Transaction [Line Items] | |||||
| Related Party Transaction, Due from (to) Related Party, Current | $ 20.3 | $ 20.3 | $ 18.0 | ||
|
Iatan No 1 And 2 [Member] | KCPL Greater Missouri Operations [Member]
|
|||||
| Related Party Transaction [Line Items] | |||||
| Jointly Owned Utility Plant, Proportionate Ownership Share | 18.00% | 18.00% | |||
| X | ||||||||||
|
- Definition
Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). 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
|
| X | ||||||||||
|
- Definition
Amount of transactions with related party during the financial reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year 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. 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, 2015
|
Dec. 31, 2014
|
|---|---|---|
|
Futures contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | $ 34.1 | $ 14.9 |
| Fair Value | (2.9) | (2.4) |
|
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 23.4 | 29.7 |
| Fair Value | 3.8 | 4.1 |
|
Option contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 0 | 1.7 |
| Fair Value | 0 | 0.1 |
|
Transmission Congestion Rights [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 12.8 | 28.3 |
| Fair Value | 0.1 | 2.6 |
|
Kansas City Power and Light Company [Member] | Futures contracts [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 5.4 | 0 |
| Fair Value | 0 | 0 |
|
Kansas City Power and Light Company [Member] | Transmission Congestion Rights [Member] | Not Designated as Hedging Instrument [Member]
|
||
| Price Risk Derivatives [Abstract] | ||
| Notional Contract Amount | 9.5 | 23.6 |
| Fair Value | $ 0.1 | $ 3.1 |
|
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 remainder of fiscal year | 43.00% | |
| Percentage of expected on peak natural gas and natural gas equivalent purchased power price exposure hedged year two | 29.00% | |
| Percentage of expected on peak natural gas and natural gas equivalent purchased power price exposure hedged year three | 10.00% |
| X | ||||||||||
|
- Definition
Percentage of expected on-peak natural gas and natural gas equivalent purchased power price exposure that is hedged for the remainder of the current fiscal year. 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
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of the assets less the liabilities of a derivative or group of derivatives. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments Cash Flow Hedge (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2015
|
|
| Derivative [Line Items] | |
| Cash Flow Hedge Loss to be Reclassified within Twelve Months | $ 9.2 |
|
Kansas City Power and Light Company [Member]
|
|
| Derivative [Line Items] | |
| Cash Flow Hedge Loss to be Reclassified within Twelve Months | $ 8.8 |
| 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 Offsetting Assets (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Offsetting Assets [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | $ 4.4 | $ 8.6 |
| Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | (0.5) | (1.2) |
| Derivative Asset | 3.9 | 7.4 |
| Derivative, Collateral, Obligation to Return Securities | 0 | 0 |
| Derivative, Collateral, Obligation to Return Cash | 0 | 0 |
| Derivative Asset, Fair Value, Amount Offset Against Collateral | 3.9 | 7.4 |
|
Kansas City Power and Light Company [Member]
|
||
| Offsetting Assets [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 0.5 | 4.0 |
| Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | (0.4) | (0.9) |
| Derivative Asset | 0.1 | 3.1 |
| Derivative, Collateral, Obligation to Return Securities | 0 | 0 |
| Derivative, Collateral, Obligation to Return Cash | 0 | 0 |
| Derivative Asset, Fair Value, Amount Offset Against Collateral | $ 0.1 | $ 3.1 |
| X | ||||||||||
|
- Definition
Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments Offsetting Liabilities (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Offsetting Liabilities [Line Items] | ||
| Derivative Liability, Fair Value, Gross Liability | $ 3.4 | $ 4.2 |
| Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | (3.3) | (3.5) |
| Derivative Liability | 0.1 | 0.7 |
| Derivative, Collateral, Right to Reclaim Securities | 0 | 0 |
| Derivative, Collateral, Right to Reclaim Cash | 0 | 0 |
| Derivative Liability, Fair Value, Amount Offset Against Collateral | 0.1 | 0.7 |
| Cash collateral posted with third parties as part of netting agreements | 2.8 | 2.3 |
|
Kansas City Power and Light Company [Member]
|
||
| Offsetting Liabilities [Line Items] | ||
| Derivative Liability, Fair Value, Gross Liability | 0.4 | 0.9 |
| Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | (0.4) | (0.9) |
| Derivative Liability | 0 | 0 |
| Derivative, Collateral, Right to Reclaim Securities | 0 | 0 |
| Derivative, Collateral, Right to Reclaim Cash | 0 | 0 |
| Derivative Liability, Fair Value, Amount Offset Against Collateral | $ 0 | $ 0 |
| 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
Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments Fair Value (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | $ 4.4 | $ 8.6 |
| Derivative Liability, Fair Value, Gross Liability | 3.4 | 4.2 |
|
Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 0.5 | 4.0 |
| Derivative Liability, Fair Value, Gross Liability | 0.4 | 0.9 |
|
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Balance Sheet Location [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 4.4 | 8.6 |
| Derivative Liability, Fair Value, Gross Liability | 3.4 | 4.2 |
|
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Balance Sheet Location [Member] | Kansas City Power and Light Company [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 0.5 | 4.0 |
| Derivative Liability, Fair Value, Gross Liability | $ 0.4 | $ 0.9 |
| X | ||||||||||
|
- Definition
Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Derivative Instruments Gain and Losses (Details) (Not Designated as Hedging Instrument [Member], Commodity Contract [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement or regulatory account for changes in fair value of commodity contracts not designated as hedging | $ (1.1) | $ (7.5) | $ (13.2) | $ (4.8) |
|
Regulatory Asset [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of gain (loss) recognized in regulatory account for changes in fair value of commodity contracts not designated as hedging | 3.1 | (4.0) | (3.2) | (4.1) |
|
Regulatory Liability [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of gain (loss) recognized in regulatory account for changes in fair value of commodity contracts not designated as hedging | 0 | (0.9) | 0 | 0.2 |
|
Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement or regulatory account for changes in fair value of commodity contracts not designated as hedging | (1.1) | (5.2) | (7.5) | (4.4) |
|
Kansas City Power and Light Company [Member] | Regulatory Asset [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of gain (loss) recognized in regulatory account for changes in fair value of commodity contracts not designated as hedging | 1.4 | (2.1) | 0 | (2.2) |
|
Purchased Power Costs [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement for changes in fair value of commodity contracts not designated as hedging | (1.1) | 0 | (1.2) | 0.4 |
|
Fuel Costs [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement for changes in fair value of commodity contracts not designated as hedging | (0.6) | 0.6 | (1.1) | 1.0 |
|
Fuel Costs [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement for changes in fair value of commodity contracts not designated as hedging | 0 | 0.1 | 0.2 | 0.1 |
|
Electric Revenues [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement for changes in fair value of commodity contracts not designated as hedging | (2.5) | (3.2) | (7.7) | (2.3) |
|
Electric Revenues [Member] | Kansas City Power and Light Company [Member]
|
||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reflected in the income statement for changes in fair value of commodity contracts not designated as hedging | $ (2.5) | $ (3.2) | $ (7.7) | $ (2.3) |
| X | ||||||||||
|
- Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement or a regulatory asset/liability. No definition available.
|
| X | ||||||||||
|
- Definition
Gains and losses (net) on derivative instruments that were recognized in a regulatory account during the current period. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Fair Value Measurements Level 3 (Details) (Derivative Financial Instruments, Assets [Member], Fair Value, Inputs, Level 3 [Member], Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Net asset (liability) beginning of period | $ (1.2) | $ 6.9 | $ 3.5 | $ 3.3 |
| Purchases | 0.4 | 7.3 | 0.6 | 13.4 |
| Settlements | 1.6 | (10.3) | 1.9 | (21.2) |
| Net asset (liability) end of period | 0.8 | 0.6 | 0.8 | 0.6 |
|
Purchased Power Costs [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | (1.1) | 0 | (1.2) | 0.4 |
|
Non-Operating Income [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | 1.6 | 4.0 | 3.7 | 11.1 |
| Total unrealized gains and (losses) relating to assets and liabilities still on the consolidated balance sheet at period end | 0 | 0.1 | (0.1) | 0.2 |
|
Electric Revenues [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | (2.5) | (3.2) | (7.7) | (2.3) |
| Total unrealized gains and (losses) relating to assets and liabilities still on the consolidated balance sheet at period end | 0 | (2.4) | 0 | (2.5) |
|
Regulatory Asset [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Regulatory Account | 2.0 | (4.1) | 0 | (4.1) |
| Total unrealized gains and (losses) relating to assets and liabilities still on the consolidated balance sheet at period end | 0 | (4.1) | 0 | (4.1) |
|
Kansas City Power and Light Company [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Net asset (liability) beginning of period | (0.8) | 3.9 | 3.1 | 1.1 |
| Purchases | 0.2 | 6.7 | (0.2) | 11.8 |
| Settlements | 1.8 | (4.4) | 4.9 | (7.5) |
| Net asset (liability) end of period | 0.1 | 0.9 | 0.1 | 0.9 |
|
Kansas City Power and Light Company [Member] | Electric Revenues [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | (2.5) | (3.2) | (7.7) | (2.3) |
| Total unrealized gains and (losses) relating to assets and liabilities still on the consolidated balance sheet at period end | 0 | (2.4) | 0 | (2.5) |
|
Kansas City Power and Light Company [Member] | Regulatory Asset [Member]
|
||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Regulatory Account | 1.4 | (2.1) | 0 | (2.2) |
| Total unrealized gains and (losses) relating to assets and liabilities still on the consolidated balance sheet at period end | $ 0 | $ (2.1) | $ 0 | $ (2.2) |
| X | ||||||||||
|
- Definition
Amount of gain (loss) recognized in a regulatory account of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related 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 the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Fair Value Measurements Fair Value Long-Term Debt (Details) (USD $)
In Billions, unless otherwise specified |
Jun. 30, 2015
|
Dec. 31, 2014
|
|---|---|---|
|
Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term Debt | $ 3.5 | $ 3.5 |
|
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 | 2.3 |
|
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term debt fair value | 3.8 | 3.8 |
|
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Kansas City Power and Light Company [Member]
|
||
| Fair value of financial instruments [Abstract] | ||
| Long-term debt fair value | $ 2.5 | $ 2.6 |
| 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.
|
|
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2015
|
Dec. 31, 2014
|
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | $ 4.4 | $ 8.6 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 3.4 | 4.2 | ||||||||||
|
Kansas City Power and Light Company [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.5 | 4.0 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.4 | 0.9 | ||||||||||
|
Fair Value, Measurements, Recurring [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 4.4 | [1] | 8.6 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 203.3 | [2] | 199.0 | [2] | ||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 15.8 | [3] | 15.1 | [3] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 17.4 | [4] | 17.9 | [4] | ||||||||
| Total assets | 240.9 | 240.6 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 3.4 | [1] | 4.2 | [1] | ||||||||
| Total liabilities | 3.4 | 4.2 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.1 | [1] | 0 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 167.9 | [2] | 162.3 | [2] | ||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 8.6 | [3] | 7.5 | [3] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0.1 | [4] | 0.1 | [4] | ||||||||
| Total assets | 176.7 | 169.9 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 3.0 | [1] | 2.4 | [1] | ||||||||
| Total liabilities | 3.0 | 2.4 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 3.1 | [1] | 3.4 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 35.4 | [2] | 36.7 | [2] | ||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 7.2 | [3] | 7.6 | [3] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 17.3 | [4] | 17.8 | [4] | ||||||||
| Total assets | 63.0 | 65.5 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0.1 | [1] | ||||||||
| Total liabilities | 0 | 0.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 1.2 | [1] | 5.2 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | [2] | 0 | [2] | ||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | [3] | 0 | [3] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0 | [4] | 0 | [4] | ||||||||
| Total assets | 1.2 | 5.2 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.4 | [1] | 1.7 | [1] | ||||||||
| Total liabilities | 0.4 | 1.7 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.5 | [1] | 4.0 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 203.3 | 199.0 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 15.8 | 15.1 | ||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 219.6 | 218.1 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.4 | [1] | 0.9 | [1] | ||||||||
| Total liabilities | 0.4 | 0.9 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Equity Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 140.1 | 137.1 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 1.2 | 1.3 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Debt Securities [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 7.2 | 7.6 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | US Treasury and Government [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 24.9 | 22.9 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | US Government Corporations and Agencies Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 2.1 | 3.5 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | US States and Political Subdivisions Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 4.0 | 4.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Corporate Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 28.8 | 28.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Foreign Government Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0.5 | 0.5 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Cash Equivalents [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 2.9 | 2.3 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Cash and Cash Equivalents [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 7.4 | 6.2 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Other Trust Assets [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0.5 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.1 | [1] | 0 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 167.9 | 162.3 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 8.6 | 7.5 | ||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 176.6 | 169.8 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.1 | [1] | 0 | [1] | ||||||||
| Total liabilities | 0.1 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 140.1 | 137.1 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 1.2 | 1.3 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 24.9 | 22.9 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Corporations and Agencies Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 2.9 | 2.3 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 7.4 | 6.2 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 1 [Member] | Other Trust Assets [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | |||||||||||
|
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] | 0 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 35.4 | 36.7 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 7.2 | 7.6 | ||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 42.6 | 44.3 | ||||||||||
| 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] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 7.2 | 7.6 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 2.1 | 3.5 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 4.0 | 4.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 28.8 | 28.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0.5 | 0.5 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 2 [Member] | Other Trust Assets [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0.5 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.4 | [1] | 4.0 | [1] | ||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| Total assets | 0.4 | 4.0 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.3 | [1] | 0.9 | [1] | ||||||||
| Total liabilities | 0.3 | 0.9 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Corporations and Agencies Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Equivalents [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
|
||||||||||||
| Self-insured health plan trust [Abstract] | ||||||||||||
| Self Insured Health Plan Trust Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Kansas City Power and Light Company [Member] | Fair Value, Inputs, Level 3 [Member] | Other Trust Assets [Member]
|
||||||||||||
| Nuclear decommissioning trust [Abstract] | ||||||||||||
| Decommissioning Fund Investments, Fair Value | 0 | |||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 3.9 | [1] | 4.6 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 17.4 | 17.9 | ||||||||||
| Total assets | 21.3 | 22.5 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 3.0 | [1] | 3.3 | [1] | ||||||||
| Total liabilities | 3.0 | 3.3 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Equity Securities [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0.1 | 0.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fixed Income Funds [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 17.3 | 17.8 | ||||||||||
|
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] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0.1 | 0.1 | ||||||||||
| Total assets | 0.1 | 0.1 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 2.9 | [1] | 2.4 | [1] | ||||||||
| Total liabilities | 2.9 | 2.4 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0.1 | 0.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 3.1 | [1] | 3.4 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 17.3 | 17.8 | ||||||||||
| Total assets | 20.4 | 21.2 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0 | [1] | 0.1 | [1] | ||||||||
| Total liabilities | 0 | 0.1 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 17.3 | 17.8 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||||||
| Assets [Abstract] | ||||||||||||
| Derivative instruments, assets | 0.8 | [1] | 1.2 | [1] | ||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0 | 0 | ||||||||||
| Total assets | 0.8 | 1.2 | ||||||||||
| Liabilities [Abstract] | ||||||||||||
| Derivative instruments, liabilities | 0.1 | [1] | 0.8 | [1] | ||||||||
| Total liabilities | 0.1 | 0.8 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | 0 | 0 | ||||||||||
|
Fair Value, Measurements, Recurring [Member] | Other Great Plains [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]
|
||||||||||||
| SERP rabbi trust [Abstract] | ||||||||||||
| SERP Rabbi Trusts, Fair Value Disclosure | $ 0 | $ 0 | ||||||||||
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| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The fair value of investments held in a trust for KCP&L's self-insurance health plan. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The fair value of investments held in rabbi trusts related to GMO's Supplemental Executive Retirement Plan (SERP). No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. No definition available.
|
| X | ||||||||||
|
- Definition
The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. No definition available.
|
|
Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||
| Beginning balance | $ (18.7) | [1] | $ (25.3) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 3.1 | [1] | 5.5 | [1] | ||||||
| Net current period other comprehensive income | 1.6 | 2.5 | 3.1 | [1] | 5.5 | [1] | ||||
| Ending balance | (15.6) | [1] | (19.8) | [1] | (15.6) | [1] | (19.8) | [1] | ||
|
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
|
||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||
| Beginning balance | (15.8) | [1] | (23.8) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 2.8 | [1] | 5.3 | [1] | ||||||
| Net current period other comprehensive income | 2.8 | [1] | 5.3 | [1] | ||||||
| Ending balance | (13.0) | [1] | (18.5) | [1] | (13.0) | [1] | (18.5) | [1] | ||
|
Accumulated Defined Benefit Plans Adjustment [Member]
|
||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||
| Beginning balance | (2.9) | [1] | (1.5) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 0.3 | [1] | 0.2 | [1] | ||||||
| Net current period other comprehensive income | 0.3 | [1] | 0.2 | [1] | ||||||
| Ending balance | (2.6) | [1] | (1.3) | [1] | (2.6) | [1] | (1.3) | [1] | ||
|
Kansas City Power and Light Company [Member]
|
||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||
| Beginning balance | (14.9) | |||||||||
| Net current period other comprehensive income | 1.3 | 1.4 | 2.7 | 2.7 | ||||||
| Ending balance | (12.2) | (12.2) | ||||||||
|
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 | (14.9) | [1] | (20.2) | [1] | ||||||
| Amounts reclassified from accumulated other comprehensive loss | 2.7 | [1] | 2.7 | [1] | ||||||
| Net current period other comprehensive income | 2.7 | [1] | 2.7 | [1] | ||||||
| Ending balance | $ (12.2) | [1] | $ (17.5) | [1] | $ (12.2) | [1] | $ (17.5) | [1] | ||
|
||||||||||
| X | ||||||||||
|
- Details
|
| 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
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| X | ||||||||||
|
- Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss). No definition available.
|
|
Accumulated Other Comprehensive Income (Loss) Reclassification (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest charges | $ (50.0) | $ (48.3) | $ (97.3) | $ (97.7) |
| Fuel | (99.9) | (115.4) | (207.5) | (250.6) |
| Utility operating and maintenance expenses | (183.4) | (183.4) | (354.9) | (364.1) |
| Income before income tax (expense) benefit and income (loss) from equity investments | 68.5 | 79.0 | 93.6 | 110.8 |
| Income tax (expense) benefit | (24.5) | (27.0) | (31.0) | (35.1) |
|
Reclassification out of Accumulated Other Comprehensive Income [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Net income (loss) | (1.6) | (2.5) | (3.1) | (5.5) |
|
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 | (2.3) | (3.9) | (4.6) | (8.6) |
| Income tax (expense) benefit | 0.9 | 1.4 | 1.8 | 3.3 |
| Net income (loss) | (1.4) | (2.5) | (2.8) | (5.3) |
|
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 | (2.3) | (3.9) | (4.6) | (8.6) |
|
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 | (0.2) | (0.1) | (0.4) | (0.3) |
| Income before income tax (expense) benefit and income (loss) from equity investments | (0.2) | (0.1) | (0.4) | (0.3) |
| Income tax (expense) benefit | 0 | 0.1 | 0.1 | 0.1 |
| Net income (loss) | (0.2) | 0 | (0.3) | (0.2) |
|
Kansas City Power and Light Company [Member]
|
||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest charges | (34.1) | (31.0) | (65.6) | (61.7) |
| Fuel | (73.1) | (88.2) | (147.9) | (181.8) |
| Utility operating and maintenance expenses | (124.6) | (129.1) | (242.9) | (256.3) |
| Income before income tax (expense) benefit and income (loss) from equity investments | 44.3 | 50.4 | 60.8 | 71.6 |
| Income tax (expense) benefit | (14.9) | (15.6) | (18.2) | (19.6) |
|
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 | (2.1) | (2.2) | (4.4) | (4.4) |
| Income tax (expense) benefit | 0.8 | 0.8 | 1.7 | 1.7 |
| Net income (loss) | (1.3) | (1.4) | (2.7) | (2.7) |
|
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 | $ (2.1) | $ (2.2) | $ (4.4) | $ (4.4) |
| 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
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of the cost of borrowed funds accounted for as interest expense. 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 | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of operating expense for fuel used by regulated operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation. 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, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
|
| Current income taxes | ||||
| Federal | $ 0 | $ (0.2) | $ 0.5 | $ 0.1 |
| State | 0 | 0 | (0.1) | 0.1 |
| Current Income Tax Expense (Benefit), Total | 0 | (0.2) | 0.4 | 0.2 |
| Deferred income taxes | ||||
| Federal | 20.3 | 25.0 | 25.4 | 31.6 |
| State | 4.5 | 5.1 | 5.9 | 6.8 |
| Deferred Income Tax Expense (Benefit), Total | 24.8 | 30.1 | 31.3 | 38.4 |
| Noncurrent income taxes | ||||
| Federal | 0 | (2.4) | 0 | (2.4) |
| State | 0 | (0.3) | 0 | (0.3) |
| Foreign | 0 | 0.2 | 0 | 0 |
| Noncurrent Income Tax Expense (Benefit), Total | 0 | (2.5) | 0 | (2.7) |
| Investment tax credit | ||||
| Investment tax credit amortization | (0.3) | (0.4) | (0.7) | (0.8) |
| Total income tax expense | 24.5 | 27.0 | 31.0 | 35.1 |
| Effective Income Tax Rate Reconciliation, Percent [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) | 1.30% | (0.60%) | 0.80% | (0.90%) |
| Amortization of investments tax credits (in hundredths) | (0.50%) | (0.50%) | (0.80%) | (0.70%) |
| Federal income tax credits (in hundredths) | (4.00%) | (3.80%) | (5.60%) | (5.40%) |
| State income taxes (in hundredths) | 3.80% | 3.80% | 3.70% | 3.80% |
| Changes in uncertain tax positions, net (in hundredths) | 0.00% | 0.30% | 0.00% | 0.00% |
| Effective Income Tax Rate Reconciliation, Other Adjustments | (0.10%) | (0.20%) | (0.30%) | (0.30%) |
| Effective Income Tax Rate Reconciliation, Percent | 35.50% | 34.00% | 32.80% | 31.50% |
|
Kansas City Power and Light Company [Member]
|
||||
| Current income taxes | ||||
| Federal | 4.2 | (2.0) | (1.5) | 0.7 |
| State | 0.7 | (0.3) | (0.4) | 0.2 |
| Current Income Tax Expense (Benefit), Total | 4.9 | (2.3) | (1.9) | 0.9 |
| Deferred income taxes | ||||
| Federal | 7.9 | 14.9 | 16.2 | 15.3 |
| State | 2.4 | 3.3 | 4.4 | 3.9 |
| Deferred Income Tax Expense (Benefit), Total | 10.3 | 18.2 | 20.6 | 19.2 |
| Investment tax credit | ||||
| Investment tax credit amortization | (0.3) | (0.3) | (0.5) | (0.5) |
| Total income tax expense | $ 14.9 | $ 15.6 | $ 18.2 | $ 19.6 |
| Effective Income Tax Rate Reconciliation, Percent [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) | 2.00% | (0.90%) | 1.30% | (1.80%) |
| Amortization of investments tax credits (in hundredths) | (0.60%) | (0.50%) | (0.90%) | (0.70%) |
| Federal income tax credits (in hundredths) | (6.20%) | (5.90%) | (8.70%) | (8.30%) |
| State income taxes (in hundredths) | 4.10% | 3.80% | 4.00% | 3.70% |
| Effective Income Tax Rate Reconciliation, Other Adjustments | (0.60%) | (0.50%) | (0.70%) | (0.60%) |
| Effective Income Tax Rate Reconciliation, Percent | 33.70% | 31.00% | 30.00% | 27.30% |
| 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
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (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
|
|
Segments and Related Information (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Jun. 30, 2015
|
Jun. 30, 2014
|
Dec. 31, 2014
|
|||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | $ 609.0 | $ 648.4 | $ 1,158.1 | $ 1,233.5 | |||||
| Depreciation and amortization | (83.5) | (75.6) | (163.3) | (150.1) | |||||
| Interest charges | (50.0) | (48.3) | (97.3) | (97.7) | |||||
| Income tax (expense) benefit | (24.5) | (27.0) | (31.0) | (35.1) | |||||
| Net income (loss) | 44.4 | 52.1 | 63.3 | 75.9 | |||||
| Assets, Total | 10,762.2 | 10,762.2 | 10,475.7 | ||||||
| Capital expenditures | 366.8 | [1] | 352.9 | 773.7 | [1] | ||||
|
Operating Segments [Member] | Electric Utility Segment [Member]
|
|||||||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | 609.0 | 648.4 | 1,158.1 | 1,233.5 | |||||
| Depreciation and amortization | (83.5) | (75.6) | (163.3) | (150.1) | |||||
| Interest charges | (47.9) | (46.0) | (93.2) | (93.0) | |||||
| Income tax (expense) benefit | (25.6) | (28.0) | (33.5) | (37.8) | |||||
| Net income (loss) | 46.4 | 54.7 | 67.3 | 80.8 | |||||
| Assets, Total | 11,039.4 | 11,039.4 | 10,746.1 | ||||||
| Capital expenditures | 366.8 | [1] | 773.7 | [1] | |||||
|
Other [Member]
|
|||||||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | 0 | 0 | 0 | 0 | |||||
| Depreciation and amortization | 0 | 0 | 0 | 0 | |||||
| Interest charges | (10.1) | (11.7) | (20.1) | (24.3) | |||||
| Income tax (expense) benefit | 1.1 | 1.0 | 2.5 | 2.7 | |||||
| Net income (loss) | (2.0) | (2.6) | (4.0) | (4.9) | |||||
| Assets, Total | 126.1 | 126.1 | 33.1 | ||||||
| Capital expenditures | 0 | [1] | 0 | [1] | |||||
|
Eliminations [Member]
|
|||||||||
| Segment Reporting Information [Line Items] | |||||||||
| Operating revenues | 0 | 0 | 0 | 0 | |||||
| Depreciation and amortization | 0 | 0 | 0 | 0 | |||||
| Interest charges | 8.0 | 9.4 | 16.0 | 19.6 | |||||
| Income tax (expense) benefit | 0 | 0 | 0 | 0 | |||||
| Net income (loss) | 0 | 0 | 0 | 0 | |||||
| Assets, Total | (403.3) | (403.3) | (303.5) | ||||||
| Capital expenditures | $ 0 | [1] | $ 0 | [1] | |||||
|
|||||||||
| 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
|
| 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
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
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- Definition
Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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- 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
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- Details
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