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INCOME TAXES - Reconciliation of unrecognized tax benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
INCOME TAXES      
Unrecognized tax benefits, beginning balance $ 162.1 $ 138.6 $ 116.7
Gross increases on unrecognized tax benefits in prior period 21.8 3.4 3.3
Gross decreases on unrecognized tax benefits in prior period   (0.2)  
Gross increases on unrecognized tax benefits in current period 32.9 26.5 24.3
Settlements (3.7)    
Lapse of statute of limitations (1.0) (6.2) (5.7)
Unrecognized tax benefits, ending balance $ 212.1 $ 162.1 $ 138.6