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INCOME TAXES - Reconciliation of unrecognized tax benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
INCOME TAXES      
Unrecognized tax benefits, beginning balance $ 212.1 $ 162.1 $ 138.6
Gross increases on unrecognized tax benefits in prior period   21.8 3.4
Gross decreases on unrecognized tax benefits in prior period (1.5)   (0.2)
Gross increases on unrecognized tax benefits in current period 31.1 32.9 26.5
Settlements (2.5) (3.7)  
Lapse of statute of limitations (1.7) (1.0) (6.2)
Unrecognized tax benefits, ending balance $ 237.5 $ 212.1 $ 162.1