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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Effective Income Tax Rate Reconciliation, Amount |  |
Statutory federal income tax, amount | $ 113.9 | $ 101.9
State income taxes net of federal tax benefit, amount | 34.0 | 31.0
Federal excess deferred tax amortization - Wisconsin unprotected, amount | (22.1) | 0.0
Wind production tax credits, amount | (18.4) | (13.4)
Federal excess deferred tax amortization, amount | (13.0) | (13.2)
Excess tax benefits-stock options, amount | (4.9) | (7.2)
Tax repairs, amount | 1.5 | (29.6)
Other, amount | (1.0) | (4.5)
Total income tax expense, amount | $ 90.0 | $ 65.0
Effective Income Tax Rate Reconciliation, Percent |  |
Statutory federal income tax, percentage | 21.00% | 21.00%
State income taxes net of federal tax benefit, percentage | 6.30% | 6.40%
Federal excess deferred tax amortization - Wisconsin unprotected, percentage | (4.10%) | 0.00%
Wind production tax credits, percentage | (3.40%) | (2.80%)
Federal excess deferred tax amortization, percentage | (2.40%) | (2.70%)
Excess tax benefits-stock options, percentage | (0.90%) | (1.50%)
Tax repairs, percentage | 0.30% | (6.10%)
Other, percentage | (0.20%) | (0.90%)
Total income tax expense, percentage | 16.60% | 13.40%

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