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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Effective Income Tax Rate Reconciliation, Amount        
Statutory federal income tax, amount $ 71.1 $ 73.7 $ 193.2 $ 219.2
State income taxes net of federal tax benefit, amount 21.0 22.2 56.8 65.8
PTCs, amount (33.9) (22.9) (100.1) (67.7)
Federal excess deferred tax amortization, amount (7.3) (8.4) (20.4) (24.2)
Other, net, amount (2.4) (1.2) (6.9) (2.6)
Total income tax expense, amount $ 48.5 $ 63.4 $ 122.6 $ 190.5
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 6.20% 6.30% 6.20% 6.30%
PTCs, percentage (10.00%) (6.50%) (10.90%) (6.50%)
Federal excess deferred tax amortization, percentage (2.20%) (2.40%) (2.20%) (2.30%)
Other, net, percentage (0.70%) (0.30%) (0.80%) (0.30%)
Total income tax expense, percent 14.30% 18.10% 13.30% 18.20%