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Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning Balance in AOCI |  | $ 83.7 | $ 184.8 | $ (85.1)
Change in Fair Value Recognized in AOCI |  | (198.5) | 340.3 | 536.8
Commodity |  |  |  |
Generation and Marketing Revenues |  | 18,982.3 | 19,639.5 | 16,792.0
Interest Rate |  |  |  |
Interest Expense |  | 1,806.9 | 1,396.1 | 1,199.1
Amortization of Pension and OPEB |  |  |  |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | 53.8 | (537.7) | (337.9)
Income Tax (Expense) Benefit |  | 54.6 | 5.4 | 115.5
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | 42.6 | (424.7) | (266.9)
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Tax |  | 16.7 | (16.7) | 0.0
Net Current Period Other Comprehensive Income (Loss) |  | (139.2) | (101.1) | 269.9
Ending Balance in AOCI |  | (55.5) | 83.7 | 184.8
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  | 4.4 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  | 21.1 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Tax |  | 16.7 |  |
Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning Balance in AOCI |  | 223.5 | 163.7 | (60.6)
Change in Fair Value Recognized in AOCI |  | (175.8) | 477.3 | 488.2
Amortization of Pension and OPEB |  |  |  |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | 72.2 | (528.5) | (334.1)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | 57.2 | (417.5) | (263.9)
Net Current Period Other Comprehensive Income (Loss) |  | (118.6) | 59.8 | 224.3
Ending Balance in AOCI |  | 104.9 | 223.5 | 163.7
Cash Flow Hedges [Member] | Commodity [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  | 0.0 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  | 0.0 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Tax |  | 0.0 |  |
Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning Balance in AOCI |  | 0.3 | (21.3) | (47.5)
Change in Fair Value Recognized in AOCI |  | (6.4) | 18.4 | 21.1
Amortization of Pension and OPEB |  |  |  |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | (2.4) | 4.0 | 6.5
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | (2.0) | 3.2 | 5.1
Net Current Period Other Comprehensive Income (Loss) |  | (8.4) | 21.6 | 26.2
Ending Balance in AOCI |  | (8.1) | 0.3 | (21.3)
Cash Flow Hedges [Member] | Interest Rate [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  | 0.0 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  | 0.0 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Tax |  | 0.0 |  |
Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning Balance in AOCI |  | 105.2 | 115.6 | 123.7
Change in Fair Value Recognized in AOCI |  | 0.0 | 0.0 | 0.0
Amortization of Pension and OPEB |  |  |  |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | (16.0) | (13.2) | (10.3)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | (12.6) | (10.4) | (8.1)
Net Current Period Other Comprehensive Income (Loss) |  | (12.6) | (10.4) | (8.1)
Ending Balance in AOCI |  | 92.6 | 105.2 | 115.6
Pension and OPEB [Member] | Changes in Funded Status [Member] |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning Balance in AOCI |  | (245.3) | (73.2) | (100.7)
Change in Fair Value Recognized in AOCI |  | (16.3) | (155.4) | 27.5
Amortization of Pension and OPEB |  |  |  |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | 0.0 | 0.0 | 0.0
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | 0.0 | 0.0 | 0.0
Net Current Period Other Comprehensive Income (Loss) |  | 0.4 | (172.1) | 27.5
Ending Balance in AOCI |  | (244.9) | (245.3) | (73.2)
Pension and OPEB [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI | Amortization of Deferred Costs [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  | 0.0 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  | 0.0 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Tax |  | 0.0 |  |
Pension and OPEB [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI | Changes in Funded Status [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  | 4.4 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  | 21.1 |  |
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Tax |  | 16.7 |  |
Generation and Marketing Revenues [Member] |  |  |  |
Commodity |  |  |  |
Generation and Marketing Revenues |  | 1,543.3 | 2,448.9 | 2,108.3
Reclassifications To Accumulated Other Comprehensive Income [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  |  | (4.4) |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax |  |  | (21.1) |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Tax |  |  | (16.7) |
Reclassifications To Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  |  | 0.0 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax |  |  | 0.0 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Tax |  |  | 0.0 |
Reclassifications To Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  |  | 0.0 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax |  |  | 0.0 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Tax |  |  | 0.0 |
Reclassifications To Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  |  | 0.0 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax |  |  | 0.0 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Tax |  |  | 0.0 |
Reclassifications To Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |  |  |  |
Amortization of Pension and OPEB |  |  |  |
Income Tax (Expense) Benefit |  |  | (4.4) |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax |  |  | (21.1) |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Tax |  |  | (16.7) |
Reclassifications from Accumulated Other Comprehensive Income [Member] |  |  |  |
Interest Rate |  |  |  |
Interest Expense | [1] | (2.4) | 4.0 | 6.5
Amortization of Pension and OPEB |  |  |  |
Amortization of Prior Service Cost (Credit) |  | (21.2) | (21.8) | (19.4)
Amortization of Actuarial (Gains) Losses |  | 5.2 | 8.6 | 9.1
Income Tax (Expense) Benefit |  | 11.2 | (113.0) | (71.0)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |
Interest Rate |  |  |  |
Interest Expense | [1] | 0.0 | 0.0 | 0.0
Amortization of Pension and OPEB |  |  |  |
Amortization of Prior Service Cost (Credit) |  | 0.0 | 0.0 | 0.0
Amortization of Actuarial (Gains) Losses |  | 0.0 | 0.0 | 0.0
Income Tax (Expense) Benefit |  | 15.0 | (111.0) | (70.2)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |
Interest Rate |  |  |  |
Interest Expense | [1] | (2.4) | 4.0 | 6.5
Amortization of Pension and OPEB |  |  |  |
Amortization of Prior Service Cost (Credit) |  | 0.0 | 0.0 | 0.0
Amortization of Actuarial (Gains) Losses |  | 0.0 | 0.0 | 0.0
Income Tax (Expense) Benefit |  | (0.4) | 0.8 | 1.4
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |  |  |  |
Interest Rate |  |  |  |
Interest Expense | [1] | 0.0 | 0.0 | 0.0
Amortization of Pension and OPEB |  |  |  |
Amortization of Prior Service Cost (Credit) |  | (21.2) | (21.8) | (19.4)
Amortization of Actuarial (Gains) Losses |  | 5.2 | 8.6 | 9.1
Income Tax (Expense) Benefit |  | (3.4) | (2.8) | (2.2)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |  |  |  |
Interest Rate |  |  |  |
Interest Expense | [1] | 0.0 | 0.0 | 0.0
Amortization of Pension and OPEB |  |  |  |
Amortization of Prior Service Cost (Credit) |  | 0.0 | 0.0 | 0.0
Amortization of Actuarial (Gains) Losses |  | 0.0 | 0.0 | 0.0
Income Tax (Expense) Benefit |  | 0.0 | 0.0 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] |  |  |  |
Commodity |  |  |  |
Generation and Marketing Revenues | [1] |  | 0.1 | 0.7
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |
Commodity |  |  |  |
Generation and Marketing Revenues | [1] |  | 0.1 | 0.7
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |
Commodity |  |  |  |
Generation and Marketing Revenues | [1] |  | 0.0 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |  |  |  |
Commodity |  |  |  |
Generation and Marketing Revenues | [1] |  | 0.0 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |  |  |  |
Commodity |  |  |  |
Generation and Marketing Revenues | [1] |  | 0.0 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member] |  |  |  |
Commodity |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation | [1] | 72.2 | (528.6) | (334.8)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |
Commodity |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation | [1] | 72.2 | (528.6) | (334.8)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |
Commodity |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation | [1] | 0.0 | 0.0 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |  |  |  |
Commodity |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation | [1] | 0.0 | 0.0 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |  |  |  |
Commodity |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation | [1] | $ 0.0 | $ 0.0 | $ 0.0
[1] | Amounts reclassified to the referenced line item on the statements of income.

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