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Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |
Beginning Balance in AOCI |  | $ (62.3) | $ (55.5) | $ (68.1) | $ 83.7 | $ (55.5) | $ 83.7
Change in Fair Value Recognized in AOCI |  | 13.9 |  | 12.9 |  | 31.8 | (190.1)
Commodity |  |  |  |  |  |  |
Generation & Marketing Revenues |  | 4,579.2 |  | 4,372.5 |  | 9,604.9 | 9,063.4
Interest Rate |  |  |  |  |  |  |
Interest Expense |  | 465.6 |  | 460.0 |  | 901.2 | 875.7
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | 10.6 |  | 23.9 |  | (20.7) | 67.5
Income Tax (Expense) Benefit |  | 6.7 |  | 28.6 |  | (135.2) | 39.0
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | 8.4 |  | 18.8 |  | (16.3) | 53.3
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  | 0.0 |  | 0.0 |  | 0.0 | 16.7
Net Current Period Other Comprehensive Income (Loss) |  | 22.3 | (6.8) | 31.7 | (151.8) | 15.5 | (120.1)
Ending Balance in AOCI |  | (40.0) | (62.3) | (36.4) | (68.1) | (40.0) | (36.4)
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  | 4.4
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  |  |  |  |  |  | 21.1
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  | 16.7
Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |
Beginning Balance in AOCI |  | 87.2 | 104.9 | 65.3 | 223.5 | 104.9 | 223.5
Change in Fair Value Recognized in AOCI |  | 7.0 |  | 5.9 |  | 12.5 | (189.4)
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | 11.8 |  | 28.3 |  | (17.5) | 75.3
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | 9.5 |  | 22.3 |  | (13.7) | 59.4
Net Current Period Other Comprehensive Income (Loss) |  | 16.5 |  | 28.2 |  | (1.2) | (130.0)
Ending Balance in AOCI |  | 103.7 | 87.2 | 93.5 | 65.3 | 103.7 | 93.5
Cash Flow Hedges [Member] | Commodity [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  |  |  |  |  |  | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets, 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 |  | 3.4 | (8.1) | 6.1 | 0.3 | (8.1) | 0.3
Change in Fair Value Recognized in AOCI |  | 6.9 |  | 7.0 |  | 19.3 | 12.2
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | (1.1) |  | (0.5) |  | (2.3) | 0.2
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | (1.0) |  | (0.4) |  | (1.9) | 0.2
Net Current Period Other Comprehensive Income (Loss) |  | 5.9 |  | 6.6 |  | 17.4 | 12.4
Ending Balance in AOCI |  | 9.3 | 3.4 | 12.7 | 6.1 | 9.3 | 12.7
Cash Flow Hedges [Member] | Interest Rate [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  |  |  |  |  |  | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  | 0.0
Pension and OPEB [Member] |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |
Beginning Balance in AOCI |  | (152.9) | (152.3) | (139.5) | (140.1) | (152.3) | (140.1)
Change in Fair Value Recognized in AOCI |  | 0.0 |  | 0.0 |  | 0.0 | (12.9)
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | (0.1) |  | (3.9) |  | (0.9) | (8.0)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | (0.1) |  | (3.1) |  | (0.7) | (6.3)
Net Current Period Other Comprehensive Income (Loss) |  | (0.1) |  | (3.1) |  | (0.7) | (2.5)
Ending Balance in AOCI |  | (153.0) | $ (152.9) | (142.6) | $ (139.5) | (153.0) | (142.6)
Pension and OPEB [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI | Pension Costs |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  | 4.4
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit |  |  |  |  |  |  | 21.1
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  | 16.7
Generation and Marketing [Member] |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |
Generation & Marketing Revenues |  | 442.5 |  | 318.2 |  | 958.4 | 645.1
Reclassifications from Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |
Interest Expense | [1] | (1.1) |  | (0.5) |  | (2.3) | 0.2
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Amortization of Prior Service Cost (Credit) |  | (1.3) |  | (5.3) |  | (2.6) | (10.6)
Amortization of Actuarial (Gains) Losses |  | 1.2 |  | 1.4 |  | 1.7 | 2.6
Income Tax (Expense) Benefit |  | 2.2 |  | 5.1 |  | (4.4) | 14.2
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |
Interest Expense | [1] | 0.0 |  | 0.0 |  | 0.0 | 0.0
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Amortization of Prior Service Cost (Credit) |  | 0.0 |  | 0.0 |  | 0.0 | 0.0
Amortization of Actuarial (Gains) Losses |  | 0.0 |  | 0.0 |  | 0.0 | 0.0
Income Tax (Expense) Benefit |  | 2.3 |  | 6.0 |  | (3.8) | 15.9
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |
Interest Expense | [1] | (1.1) |  | (0.5) |  | (2.3) | 0.2
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Amortization of Prior Service Cost (Credit) |  | 0.0 |  | 0.0 |  | 0.0 | 0.0
Amortization of Actuarial (Gains) Losses |  | 0.0 |  | 0.0 |  | 0.0 | 0.0
Income Tax (Expense) Benefit |  | (0.1) |  | (0.1) |  | (0.4) | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |
Interest Expense | [1] | 0.0 |  | 0.0 |  | 0.0 | 0.0
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |
Amortization of Prior Service Cost (Credit) |  | (1.3) |  | (5.3) |  | (2.6) | (10.6)
Amortization of Actuarial (Gains) Losses |  | 1.2 |  | 1.4 |  | 1.7 | 2.6
Income Tax (Expense) Benefit |  | 0.0 |  | (0.8) |  | (0.2) | (1.7)
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] | 11.8 |  | 28.3 |  | (17.5) | 75.3
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] | 11.8 |  | 28.3 |  | (17.5) | 75.3
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 | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member] | Pension and OPEB [Member] |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation | [1] | $ 0.0 |  | $ 0.0 |  | $ 0.0 | $ 0.0
[1] | Amounts reclassified to the referenced line item on the statements of income.

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