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INCOME TAXES - Components of income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax expense:      
Federal $ 148.4 $ 143.7 $ 98.7
State 83.4 70.5 61.2
Foreign 14.2 8.9 7.9
Total current tax expense 246.0 223.1 167.8
Deferred income tax expense/(benefit):      
Federal (24.3) (25.2) (28.7)
State (7.3) (9.1) (3.8)
Foreign 12.7 3.4 (4.7)
Total deferred income tax benefit (18.9) (30.9) (37.2)
Total $ 227.1 $ 192.2 $ 130.6