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Income Taxes - Statutory Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statutory rate reconciliation of amount |  |  |
Statutory federal income tax | $ 367.3 | $ 322.6 | $ 363.5
State income taxes net of federal tax benefit | 108.0 | 94.3 | 109.7
PTCs, net | (200.1) | (168.2) | (107.6)
Federal excess deferred tax amortization | (36.7) | (37.6) | (36.9)
AFUDC - Equity | (12.6) | (12.4) | (6.2)
Other, net | (3.9) | 5.9 | 0.4
Total income tax expense | $ 222.0 | $ 204.6 | $ 322.9
Statutory rate reconciliation of percent |  |  |
Statutory federal income tax | 21.00% | 21.00% | 21.00%
State income taxes net of federal tax benefit | 6.20% | 6.10% | 6.30%
PTCs, net | (11.50%) | (10.90%) | (6.20%)
Federal excess deferred tax amortization | (2.10%) | (2.40%) | (2.10%)
AFUDC - Equity | (0.70%) | (0.80%) | (0.40%)
Other, net | (0.20%) | 0.30% | 0.00%
Total income tax expense | 12.70% | 13.30% | 18.60%
Public Service Commission of Wisconsin (PSCW) | Tax Cuts and Jobs Act of 2017 | 2018 and 2019 rates |  |  |
Income taxes |  |  |
Income statement impact of amortizing protected tax benefits | $ 0.0 | $ 0.0 | $ 0.0

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