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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Effective Income Tax Rate Reconciliation, Amount    
Statutory federal income tax, amount $ 149.1 $ 122.1
State income taxes net of federal tax benefit, amount 43.4 35.8
PTCs, net, amount (88.0) (66.2)
Federal excess deferred tax amortization, amount (15.4) (13.1)
Other, net, amount (1.4) (4.5)
Total income tax expense, amount $ 87.7 $ 74.1
Effective Income Tax Rate Reconciliation, Percent    
Statutory federal income tax, percentage 21.00% 21.00%
State income taxes net of federal tax benefit, percentage 6.10% 6.20%
PTCs, net, percentage (12.40%) (11.40%)
Federal excess deferred tax amortization, percentage (2.20%) (2.30%)
Other, net, percentage (0.20%) (0.80%)
Total income tax expense, percent 12.30% 12.70%