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ACCUMULATED OTHER COMPREHENSIVE INCOME, NET (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
AOCI Rollforward          
Beginning balance $ 3,404.2 $ 3,348.9 $ 3,310.1 $ 3,355.6 $ 3,348.9
Other comprehensive (loss) income 6.0 4.8 (2.7) (37.5)  
Ending balance 3,442.5 3,404.2 3,286.3 3,310.1 3,442.5
Accumulated Other Comprehensive Income (loss), net          
AOCI Rollforward          
Beginning balance 79.8 75.0 0.1 37.6 75.0
Other comprehensive (loss) income 6.0 4.8 (2.7) (37.5) 10.8
Ending balance 85.8 79.8 $ (2.6) $ 0.1 85.8
Foreign Currency Translation          
AOCI Rollforward          
Beginning balance   74.7     74.7
Other comprehensive (loss) income         10.8
Ending balance 85.5       85.5
Unrealized Investment Gain/Loss          
AOCI Rollforward          
Beginning balance   (0.1)     (0.1)
Ending balance (0.1)       (0.1)
Post-Retirement Benefits          
AOCI Rollforward          
Beginning balance   $ 0.4     0.4
Ending balance $ 0.4       $ 0.4