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ACCUMULATED OTHER COMPREHENSIVE INCOME, NET (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
AOCI Rollforward              
Beginning balance $ 3,442.5 $ 3,404.2 $ 3,348.9 $ 3,286.3 $ 3,310.1 $ 3,355.6 $ 3,348.9
Other comprehensive (loss) income (19.8) 6.0 4.8 31.6 (2.7) (37.5)  
Ending balance 3,497.0 3,442.5 3,404.2 3,344.5 3,286.3 3,310.1 3,497.0
Accumulated Other Comprehensive Income (loss), net              
AOCI Rollforward              
Beginning balance 85.8 79.8 75.0 (2.6) 0.1 37.6 75.0
Other comprehensive (loss) income (19.8) 6.0 4.8 31.6 (2.7) (37.5) (9.0)
Ending balance 66.0 $ 85.8 79.8 $ 29.0 $ (2.6) $ 0.1 66.0
Foreign Currency Translation              
AOCI Rollforward              
Beginning balance     74.7       74.7
Other comprehensive (loss) income             (8.9)
Ending balance 65.8           65.8
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
Other comprehensive (loss) income             (0.1)
Ending balance $ 0.3           $ 0.3