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INCOME TAXES - Components of income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current tax expense:      
Federal $ 188.1 $ 210.4 $ 148.4
State 97.8 130.2 83.4
Foreign 15.5 13.0 14.2
Total current tax expense 301.4 353.6 246.0
Deferred income tax (benefit)/expense      
Federal (3.4) (126.2) (24.3)
State 1.5 (22.7) (7.3)
Foreign (13.3) (6.8) 12.7
Total deferred income tax benefit (15.2) (155.7) (18.9)
Total $ 286.2 $ 197.9 $ 227.1