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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2023
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Cash Flow HedgesPension and OPEB 
For the Year Ended December 31, 2023CommodityInterest RateAmortization of Deferred CostsChanges in Funded StatusTotal
 (in millions)
Balance in AOCI as of December 31, 2022$223.5 $0.3 $105.2 $(245.3)$83.7 
Change in Fair Value Recognized in AOCI, Net of Tax(175.8)(6.4)— (16.3)(198.5)
Amount of (Gain) Loss Reclassified from AOCI
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)
72.2 — — — 72.2 
Interest Expense (a)
— (2.4)— — (2.4)
Amortization of Prior Service Cost (Credit)
— — (21.2)— (21.2)
Amortization of Actuarial (Gains) Losses
— — 5.2 — 5.2 
Reclassifications from AOCI, before Income Tax (Expense) Benefit
72.2 (2.4)(16.0)— 53.8 
Income Tax (Expense) Benefit
15.0 (0.4)(3.4)— 11.2 
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit
57.2 (2.0)(12.6)— 42.6 
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, before Income Tax (Expense) Benefit— — — 21.1 21.1 
Income Tax (Expense) Benefit— — — 4.4 4.4 
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Income Tax (Expense) Benefit— — — 16.7 16.7 
Net Current Period Other Comprehensive Income (Loss)
(118.6)(8.4)(12.6)0.4 (139.2)
Balance in AOCI as of December 31, 2023$104.9 $(8.1)$92.6 $(244.9)$(55.5)

 Cash Flow HedgesPension and OPEB 
For the Year Ended December 31, 2022CommodityInterest Rate Amortization of Deferred CostsChanges in Funded StatusTotal
 (in millions)
Balance in AOCI as of December 31, 2021$163.7 $(21.3)$115.6 $(73.2)$184.8 
Change in Fair Value Recognized in AOCI, Net of Tax477.3 18.4 — (155.4)340.3 
Amount of (Gain) Loss Reclassified from AOCI
Generation & Marketing Revenues (a)0.1 — — — 0.1 
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)
(528.6)— — — (528.6)
Interest Expense (a)
— 4.0 — — 4.0 
Amortization of Prior Service Cost (Credit)
— — (21.8)— (21.8)
Amortization of Actuarial (Gains) Losses
— — 8.6 — 8.6 
Reclassifications from AOCI, before Income Tax (Expense) Benefit
(528.5)4.0 (13.2)— (537.7)
Income Tax (Expense) Benefit
(111.0)0.8 (2.8)— (113.0)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit
(417.5)3.2 (10.4)— (424.7)
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax (Expense) Benefit— — — (21.1)(21.1)
Income Tax (Expense) Benefit— — — (4.4)(4.4)
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Income Tax (Expense) Benefit— — — (16.7)(16.7)
Net Current Period Other Comprehensive Income (Loss)
59.8 21.6 (10.4)(172.1)(101.1)
Balance in AOCI as of December 31, 2022$223.5 $0.3 $105.2 $(245.3)$83.7 
 Cash Flow HedgesPension and OPEB 
For the Year Ended December 31, 2021CommodityInterest Rate Amortization of Deferred CostsChanges in Funded StatusTotal
 (in millions)
Balance in AOCI as of December 31, 2020$(60.6)$(47.5)$123.7 $(100.7)$(85.1)
Change in Fair Value Recognized in AOCI, Net of Tax488.2 21.1 — 27.5 536.8 
Amount of (Gain) Loss Reclassified from AOCI
Generation & Marketing Revenues (a)0.7 — — — 0.7 
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)
(334.8)— — — (334.8)
Interest Expense (a)
— 6.5 — — 6.5 
Amortization of Prior Service Cost (Credit)
— — (19.4)— (19.4)
Amortization of Actuarial (Gains) Losses
— — 9.1 — 9.1 
Reclassifications from AOCI, before Income Tax (Expense) Benefit
(334.1)6.5 (10.3)— (337.9)
Income Tax (Expense) Benefit
(70.2)1.4 (2.2)— (71.0)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit
(263.9)5.1 (8.1)— (266.9)
Net Current Period Other Comprehensive Income (Loss)
224.3 26.2 (8.1)27.5 269.9 
Balance in AOCI as of December 31, 2021$163.7 $(21.3)$115.6 $(73.2)$184.8 
(a)Amounts reclassified to the referenced line item on the statements of income.