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Income Taxes - Statutory Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2020
Statutory rate reconciliation of amount |  |  |  |
Statutory federal income tax | $ 322.6 | $ 363.5 | $ 315.1 |
State income taxes net of federal tax benefit | 94.3 | 109.7 | 96.1 |
PTCs, net | (168.2) | (107.6) | (81.3) |
Federal excess deferred tax amortization | (37.6) | (36.9) | (37.3) |
AFUDC - Equity | (12.4) | (6.2) | (3.8) |
Federal excess deferred tax amortization - Wisconsin unprotected | (0.8) | (0.8) | (77.9) |
Other, net | 6.7 | 1.2 | (10.6) |
Total income tax expense | $ 204.6 | $ 322.9 | $ 200.3 |
Statutory rate reconciliation of percent |  |  |  |
Statutory federal income tax | 21.00% | 21.00% | 21.00% |
State income taxes net of federal tax benefit | 6.10% | 6.30% | 6.40% |
PTCs, net | (10.90%) | (6.20%) | (5.40%) |
Federal excess deferred tax amortization | (2.40%) | (2.10%) | (2.50%) |
AFUDC - Equity | (0.80%) | (0.40%) | (0.30%) |
Federal excess deferred tax amortization - Wisconsin unprotected | (0.10%) | 0.00% | (5.20%) |
Other, net | 0.40% | 0.00% | (0.60%) |
Total income tax expense | 13.30% | 18.60% | 13.40% |
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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