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Income Taxes - Statutory rate reconciliation (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Statutory federal income tax |  | $ 315.1 | $ 299.9 | $ 264.4
State income taxes net of federal tax benefit |  | 96.1 | 90.5 | 80.4
Wind PTCs |  | (81.3) | (51.5) | (34.1)
Federal excess deferred tax amortization - Wisconsin unprotected |  | (77.9) | (57.6) | 0.0
Federal excess deferred tax amortization |  | (37.3) | (36.7) | (34.9)
ITC restored |  | (4.6) | (3.5) | (4.8)
AFUDC - Equity |  | (3.8) | (4.4) | (3.0)
Excess tax benefits - stock options |  | (3.2) | (12.3) | (15.8)
Tax repairs |  | 4.0 | 3.3 | (122.8)
Other, net |  | (6.8) | 0.2 | (4.4)
Total income tax expense |  | $ 200.3 | $ 227.9 | $ 125.0
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Statutory federal income tax |  | 21.00% | 21.00% | 21.00%
State income taxes net of federal tax benefit |  | 6.40% | 6.30% | 6.40%
Wind PTCs |  | (5.40%) | (3.60%) | (2.70%)
Federal excess deferred tax amortization - Wisconsin unprotected |  | (5.20%) | (4.00%) | 0.00%
Federal excess deferred tax amortization |  | (2.50%) | (2.60%) | (2.80%)
ITC restored |  | (0.30%) | (0.20%) | (0.40%)
AFUDC - Equity |  | (0.30%) | (0.30%) | (0.20%)
Excess tax benefits - stock options |  | (0.20%) | (0.90%) | (1.30%)
Tax repairs |  | 0.30% | 0.20% | (9.80%)
Other, net |  | (0.40%) | 0.00% | (0.30%)
Total income tax expense |  | 13.40% | 15.90% | 9.90%
2018 and 2019 rates | Public Service Commission of Wisconsin (PSCW) | Tax Cuts and Jobs Act of 2017 |  |  |  |
Income taxes |  |  |  |
Income Statement Impact of amortizing protected tax benefits |  | $ 0.0 | $ 0.0 | $ 0.0
2018 and 2019 rates | Public Service Commission of Wisconsin (PSCW) | WE | Tax Repairs Regulatory Asset |  |  |  |
Income taxes |  |  |  |
Income statement impact of flow through of repair related deferred tax liabilities |  |  |  | $ 0.0
2020 and 2021 rates | Public Service Commission of Wisconsin (PSCW) | Tax Cuts and Jobs Act of 2017 |  |  |  |
Income taxes |  |  |  |
Income Statement Impact of amortizing unprotected tax benefits |  | $ 0.0 | $ 0.0 |
2020 and 2021 rates | Public Service Commission of Wisconsin (PSCW) | WE | Tax Repairs Regulatory Asset |  |  |  |
Income taxes |  |  |  |
Amortization period |  | 50 years |  |
2020 and 2021 rates | Public Service Commission of Wisconsin (PSCW) | Electric rates | Tax Cuts and Jobs Act of 2017 |  |  |  |
Income taxes |  |  |  |
Amortization period | 2 years |  |  |
2020 and 2021 rates | Public Service Commission of Wisconsin (PSCW) | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |  |
Income taxes |  |  |  |
Amortization period | 4 years |  |  |

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