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Income Taxes - Statutory Rate Reconciliation (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statutory rate reconciliation of amount |  |  |  |
Statutory federal income tax |  | $ 363.5 | $ 315.1 | $ 299.9
State income taxes net of federal tax benefit |  | 109.7 | 96.1 | 90.5
Wind PTCs |  | (107.6) | (81.3) | (51.5)
Federal excess deferred tax amortization |  | (36.9) | (37.3) | (36.7)
AFUDC - Equity |  | (6.2) | (3.8) | (4.4)
ITC restored |  | (5.8) | (4.6) | (3.5)
Federal excess deferred tax amortization - Wisconsin unprotected |  | (0.8) | (77.9) | (57.6)
Other, net |  | 7.0 | (6.0) | (8.8)
Total income tax expense |  | $ 322.9 | $ 200.3 | $ 227.9
Statutory rate reconciliation of percent |  |  |  |
Statutory federal income tax |  | 21.00% | 21.00% | 21.00%
State income taxes net of federal tax benefit |  | 6.30% | 6.40% | 6.30%
Wind PTCs |  | (6.20%) | (5.40%) | (3.60%)
Federal excess deferred tax amortization |  | (2.10%) | (2.50%) | (2.60%)
AFUDC - Equity |  | (0.40%) | (0.30%) | (0.30%)
ITC restored |  | (0.30%) | (0.30%) | (0.20%)
Federal excess deferred tax amortization - Wisconsin unprotected |  | 0.00% | (5.20%) | (4.00%)
Other, net |  | 0.30% | (0.30%) | (0.70%)
Total income tax expense |  | 18.60% | 13.40% | 15.90%
Public Service Commission of Wisconsin (PSCW) | Tax Cuts and Jobs Act of 2017 | 2020 and 2021 rates |  |  |  |
Income taxes |  |  |  |
Income statement impact of amortizing unprotected tax benefits |  | $ 0.0 | $ 0.0 | $ 0.0
Public Service Commission of Wisconsin (PSCW) | Tax Cuts and Jobs Act of 2017 | 2020 and 2021 rates | Electric rates |  |  |  |
Income taxes |  |  |  |
Amortization period | 2 years |  |  |
Public Service Commission of Wisconsin (PSCW) | Tax Cuts and Jobs Act of 2017 | 2020 and 2021 rates | Natural gas rates |  |  |  |
Income taxes |  |  |  |
Amortization period | 4 years |  |  |
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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