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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%