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Income Taxes - Statutory rate reconciliation (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 USD ($) change | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Statutory federal income tax |  | $ 264.4 | $ 258.1 | $ 555.5
State income taxes net of federal tax benefit |  | 80.4 | 71.8 | 100.8
Tax repairs |  | (122.8) | (120.7) | 0.0
Federal excess deferred tax amortization |  | (34.9) | (16.8) | 0.0
Wind production tax credits |  | (34.1) | (12.1) | (16.8)
Excess tax benefits - stock options |  | (15.8) | (5.9) | (10.0)
Investment tax credit restored |  | (4.8) | (2.8) | (2.7)
AFUDC - Equity |  | (3.0) | (3.2) | (4.0)
Federal tax reform |  | 0.0 | 0.0 | (226.9)
Other, net |  | (4.4) | 1.4 | (12.4)
Total income tax expense |  | $ 125.0 | $ 169.8 | 383.5
Net impact of tax cuts and jobs act of 2017 |  |  |  | $ 206.7
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Statutory federal income tax | 21.00% | 21.00% | 21.00% | 35.00%
State income taxes net of federal tax benefit |  | 6.40% | 5.80% | 6.40%
Tax repairs |  | (9.80%) | (9.80%) | 0.00%
Federal excess deferred tax amortization |  | (2.80%) | (1.40%) | 0.00%
Wind production tax credits |  | (2.70%) | (1.00%) | (1.10%)
Excess tax benefits - stock options |  | (1.30%) | (0.50%) | (0.60%)
Investment tax credit restored |  | (0.40%) | (0.20%) | (0.20%)
AFUDC - Equity |  | (0.20%) | (0.30%) | (0.30%)
Feceral tax reform |  | 0.00% | 0.00% | (14.30%)
Other, net |  | (0.30%) | 0.20% | (0.80%)
Total income tax expense |  | 9.90% | 13.80% | 24.10%
2018 and 2019 rates | WE | Public Service Commission of Wisconsin (PSCW) |  |  |  |
Income taxes |  |  |  |
Income statement impact of flow through of repair related deferred tax liabilities | change |  | 0 |  |

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