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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statement of Comprehensive Income [Abstract] |  |  |
Cash Flow Hedges, Tax | $ 1.3 | $ (33.8) | $ 21.6
Amortization of Pension and OPEB Deferred Costs, Tax | (0.7) | (3.4) | (2.8)
Pension and OPEB Funded Status, Tax | 10.9 | (4.3) | (41.3)
Recognition of Pension Settlement Costs, Tax | 2.4 | 0.0 | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Tax | $ 0.0 | $ 4.4 | $ (4.4)

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