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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|  | Cash Flow Hedges |  | Pension and OPEB |  |
For the Year Ended December 31, 2023 |  | Commodity |  | Interest Rate |  | Amortization of Deferred Costs |  | Changes in Funded Status |  | Total
|  | (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 Hedges |  |  |  | Pension and OPEB |  |
For the Year Ended December 31, 2022 |  | Commodity |  | Interest Rate |  |  |  | Amortization of Deferred Costs |  | Changes in Funded Status |  | Total
|  | (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 Tax |  | 477.3 |  |  | 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 Hedges |  |  |  | Pension and OPEB |  |
For the Year Ended December 31, 2021 |  | Commodity |  | Interest Rate |  |  |  | Amortization of Deferred Costs |  | Changes in Funded Status |  | Total
|  | (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 Tax |  | 488.2 |  |  | 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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
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