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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Effective Income Tax Rate Reconciliation, Amount        
Statutory federal income tax, amount $ 64.3 $ 57.0 $ 284.7 $ 259.2
State income taxes net of federal tax benefit, amount 18.5 16.9 82.2 75.9
PTCs, net, amount (33.4) (33.7) (194.0) (143.9)
Federal excess deferred tax amortization, amount (6.5) (5.8) (32.0) (26.1)
AFUDC-Equity, amount (4.6) (1.3) (15.8) (9.4)
Other, net, amount (3.9) (1.5) (10.5) 5.2
Total income tax expense, amount $ 34.4 $ 31.6 $ 114.6 $ 160.9
Effective Income Tax Rate Reconciliation, Percent        
Statutory federal income tax, percent 21.00% 21.00% 21.00% 21.00%
State income taxes net of federal tax benefit, percent 6.00% 6.20% 6.10% 6.20%
PTCs, net, percent (10.90%) (12.40%) (14.30%) (11.70%)
Federal excess deferred tax amortization, percent (2.10%) (2.10%) (2.40%) (2.10%)
AFUDC-Equity, percent (1.50%) (0.50%) (1.20%) (0.80%)
Other, net, percent (1.20%) (0.50%) (0.70%) 0.50%
Total income tax expense, percent 11.30% 11.70% 8.50% 13.10%