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v3.23.3

Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Beginning Balance in AOCI |  | $ (36.4) |  | $ 83.7 | $ 551.4 |  | $ 184.8 | $ 83.7 | $ 184.8
Change in Fair Value Recognized in AOCI |  | 12.4 |  |  | 101.7 |  |  | (177.7) | 646.0
Commodity |  |  |  |  |  |  |  |  |
Generation & Marketing Revenues |  | 5,341.7 |  |  | 5,526.1 |  |  | 14,405.1 | 14,758.4
Interest Rate |  |  |  |  |  |  |  |  |
Interest Expense |  | 470.3 |  |  | 360.7 |  |  | 1,346.0 | 1,001.7
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | (20.9) |  |  | (225.5) |  |  | 46.6 | (439.1)
Income Tax (Expense) Benefit |  | 64.2 |  |  | (16.1) |  |  | 103.2 | 90.7
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | (16.5) |  |  | (178.2) |  |  | 36.8 | (346.9)
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  | 0.0 |  |  | 0.0 |  |  | 16.7 | 0.0
Net Current Period Other Comprehensive Income (Loss) |  | (4.1) | $ 31.7 | (151.8) | (76.5) | $ 120.8 | 245.8 | (124.2) | 290.1
Ending Balance in AOCI |  | (40.5) | (36.4) |  | 474.9 | 551.4 |  | (40.5) | 474.9
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 |  | 93.5 |  | 223.5 | 533.6 |  | 163.7 | 223.5 | 163.7
Change in Fair Value Recognized in AOCI |  | 19.3 |  |  | 94.3 |  |  | (170.1) | 629.8
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | (15.6) |  |  | (222.4) |  |  | 59.7 | (432.1)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | (12.2) |  |  | (175.8) |  |  | 47.2 | (341.4)
Net Current Period Other Comprehensive Income (Loss) |  | 7.1 |  |  | (81.5) |  |  | (122.9) | 288.4
Ending Balance in AOCI |  | 100.6 | 93.5 |  | 452.1 | 533.6 |  | 100.6 | 452.1
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 |  | 12.7 |  | 0.3 | (10.8) |  | (21.3) | 0.3 | (21.3)
Change in Fair Value Recognized in AOCI |  | (6.9) |  |  | 7.4 |  |  | 5.3 | 16.2
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | (1.3) |  |  | 0.9 |  |  | (1.1) | 3.1
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | (1.1) |  |  | 0.8 |  |  | (0.9) | 2.5
Net Current Period Other Comprehensive Income (Loss) |  | (8.0) |  |  | 8.2 |  |  | 4.4 | 18.7
Ending Balance in AOCI |  | 4.7 | 12.7 |  | (2.6) | (10.8) |  | 4.7 | (2.6)
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 |  | (142.6) |  | $ (140.1) | 28.6 |  | $ 42.4 | (140.1) | 42.4
Change in Fair Value Recognized in AOCI |  | 0.0 |  |  | 0.0 |  |  | (12.9) | 0.0
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Reclassification from AOCI, before Income Tax (Expense) Benefit |  | (4.0) |  |  | (4.0) |  |  | (12.0) | (10.1)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit |  | (3.2) |  |  | (3.2) |  |  | (9.5) | (8.0)
Net Current Period Other Comprehensive Income (Loss) |  | (3.2) |  |  | (3.2) |  |  | (5.7) | (17.0)
Ending Balance in AOCI |  | (145.8) | $ (142.6) |  | 25.4 | $ 28.6 |  | (145.8) | 25.4
Pension and OPEB [Member] | 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 |
Generation and Marketing [Member] |  |  |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |  |  |
Generation & Marketing Revenues |  | 527.5 |  |  | 733.1 |  |  | 1,172.6 | 1,997.0
Reclassifications To Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  |  |  | (2.4)
Reclassifications to AOCI, Current Period, before Tax, Attributable to Parent |  |  |  |  |  |  |  |  | (11.4)
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  |  |  | (9.0)
Reclassifications To Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  |  |  | 0.0
Reclassifications to AOCI, Current Period, before Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  |  |  | 0.0
Reclassifications To Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  |  |  | 0.0
Reclassifications to AOCI, Current Period, before Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 0.0
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  |  |  | 0.0
Reclassifications To Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Pension Costs |  |  |  |  |  |  |  |  |
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  |  |  |  |  | (2.4)
Reclassifications to AOCI, Current Period, before Tax, Attributable to Parent |  |  |  |  |  |  |  |  | (11.4)
Reclassifications of KPCo Pension and OPEB Regulatory Assets, Net of Tax |  |  |  |  |  |  |  |  | (9.0)
Reclassifications from Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |
Interest Expense | [1] | (1.3) |  |  | 0.9 |  |  | (1.1) | 3.1
Amortization Of Pension And Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Amortization of Prior Service Cost (Credit) |  | (5.3) |  |  | (6.2) |  |  | (15.9) | (16.5)
Amortization of Actuarial (Gains) Losses |  | 1.3 |  |  | 2.2 |  |  | 3.9 | 6.4
Income Tax (Expense) Benefit |  | (4.4) |  |  | (47.3) |  |  | 9.8 | (92.2)
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 |  | (3.4) |  |  | (46.6) |  |  | 12.5 | (90.7)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |
Interest Expense | [1] | (1.3) |  |  | 0.9 |  |  | (1.1) | 3.1
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 |  | (0.2) |  |  | 0.1 |  |  | (0.2) | 0.6
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) |  | (5.3) |  |  | (6.2) |  |  | (15.9) | (16.5)
Amortization of Actuarial (Gains) Losses |  | 1.3 |  |  | 2.2 |  |  | 3.9 | 6.4
Income Tax (Expense) Benefit |  | (0.8) |  |  | (0.8) |  |  | (2.5) | (2.1)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] |  |  |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |  |  |
Generation & Marketing Revenues | [1] |  |  |  | 0.2 |  |  |  | 0.2
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] | Cash Flow Hedges [Member] | Commodity [Member] |  |  |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |  |  |
Generation & Marketing Revenues | [1] |  |  |  | 0.2 |  |  |  | 0.2
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] |  |  |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |  |  |
Generation & Marketing Revenues | [1] |  |  |  | 0.0 |  |  |  | 0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] | Pension and OPEB [Member] |  |  |  |  |  |  |  |  |
Commodity |  |  |  |  |  |  |  |  |
Generation & 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] | (15.6) |  |  | (222.6) |  |  | 59.7 | (432.3)
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] | (15.6) |  |  | (222.6) |  |  | 59.7 | (432.3)
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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