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ACCUMULATED OTHER COMPREHENSIVE LOSS, NET (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
AOCI Rollforward          
Beginning balance $ 4,024.1 $ 3,985.0 $ 3,538.7 $ 3,465.3 $ 3,985.0
Other comprehensive (loss) income (3.2) (13.8) 9.8 18.8  
Ending balance 4,021.7 4,024.1 3,664.4 3,538.7 4,021.7
Accumulated Other Comprehensive Loss, Net          
AOCI Rollforward          
Beginning balance (23.2) (9.4) (12.2) (31.0) (9.4)
Other comprehensive (loss) income (3.2) (13.8) 9.8 18.8 (17.0)
Ending balance (26.4) (23.2) $ (2.4) $ (12.2) (26.4)
Foreign Currency Translation Adjustment          
AOCI Rollforward          
Beginning balance   (5.6)     (5.6)
Other comprehensive (loss) income         (16.2)
Ending balance (21.8)       (21.8)
Unrealized Investment Loss          
AOCI Rollforward          
Beginning balance   (3.7)     (3.7)
Other comprehensive (loss) income         (1.0)
Ending balance (4.7)       (4.7)
Post-Retirement Benefits          
AOCI Rollforward          
Beginning balance   $ (0.1)     (0.1)
Other comprehensive (loss) income         0.2
Ending balance $ 0.1       $ 0.1