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ACCUMULATED OTHER COMPREHENSIVE INCOME, NET (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Rollforward      
Beginning balance $ 3,348.9 $ 3,355.6 $ 3,241.0
Other comprehensive (loss) income (19.4) 37.4 26.1
Ending balance 3,604.8 3,348.9 3,355.6
Accumulated Other Comprehensive (Loss) Income      
AOCI Rollforward      
Beginning balance 75.0 37.6 11.5
Other comprehensive (loss) income (19.4) 37.4 26.1
Ending balance 55.6 75.0 37.6
Foreign Currency Translation      
AOCI Rollforward      
Beginning balance 74.7 38.2  
Other comprehensive (loss) income (19.3) 36.5  
Ending balance 55.4 74.7 38.2
Unrealized Investment Gain/Loss      
AOCI Rollforward      
Beginning balance (0.1) 0.2  
Other comprehensive (loss) income   (0.3)  
Ending balance (0.1) (0.1) 0.2
Post-Retirement Benefits      
AOCI Rollforward      
Beginning balance 0.4 (0.8)  
Other comprehensive (loss) income (0.1) 1.2  
Ending balance $ 0.3 $ 0.4 $ (0.8)