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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Effective Income Tax Rate Reconciliation, Amount        
Statutory federal income tax, amount $ 73.7 $ 69.1 $ 219.2 $ 191.9
State income taxes net of federal tax benefit, amount 22.2 20.8 65.8 57.7
PTCs, amount (22.9) (13.5) (67.7) (47.5)
Federal excess deferred tax amortization, amount (8.4) (7.9) (24.2) (22.5)
Federal excess deferred tax amortization - Wisconsin unprotected, amount (0.2) (16.3) (0.5) (46.6)
Other, amount (1.0) 1.9 (2.1) (4.0)
Total income tax expense, amount $ 63.4 $ 54.1 $ 190.5 $ 129.0
Effective Income Tax Rate Reconciliation, Percent        
Statutory federal income tax, percentage 21.00% 21.00% 21.00% 21.00%
State income taxes net of federal tax benefit, percentage 6.30% 6.30% 6.30% 6.30%
PTCs, percentage (6.50%) (4.10%) (6.50%) (5.20%)
Federal excess deferred tax amortization, percentage (2.40%) (2.40%) (2.30%) (2.50%)
Federal excess deferred tax amortization - Wisconsin unprotected, percentage 0.00% (5.00%) (0.10%) (5.10%)
Other, percentage (0.30%) 0.60% (0.20%) (0.40%)
Total income tax expense, percent 18.10% 16.40% 18.20% 14.10%