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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amount      
Income tax provision at the statutory rate $ 120.8 $ 168.3 $ 277.0
State income tax expense, net 22.8 29.8 42.7
Non-deductible items 2.5 1.7 1.6
Other, net (1.1) (1.0) 0.5
Total Income Tax Expense $ 145.0 $ 198.8 $ 321.8
Percent      
Income tax provision at the statutory rate 21.00% 21.00% 21.00%
State income tax expense, net 4.00% 3.70% 3.20%
Non-deductible items 0.40% 0.20% 0.10%
Other, net (0.20%) (0.10%) 0.10%
Income tax provision 25.20% 24.80% 24.40%