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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax    
Beginning balance $ 4,574.3 $ 4,148.3
Ending balance 4,658.4 3,901.1
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (122.4) (154.8)
Other comprehensive gain (loss) before reclassifications (30.2) 11.6
Amounts reclassified from accumulated other comprehensive loss (1.6) (1.7)
Deferred income tax benefit (expense) (0.4) (7.6)
Ending balance (154.6) (152.5)
Unrealized Loss on Hedges    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (27.7) 12.5
Other comprehensive gain (loss) before reclassifications 34.8 19.0
Amounts reclassified from accumulated other comprehensive loss (0.9) (8.6)
Deferred income tax benefit (expense) (9.4) (3.8)
Ending balance (3.2) 19.1
Unrealized Gain on Available-for-sale Investments    
AOCI Attributable to Parent, Net of Tax    
Beginning balance 8.6 1.7
Other comprehensive gain (loss) before reclassifications (6.1) (6.3)
Amounts reclassified from accumulated other comprehensive loss 0.9 (0.1)
Deferred income tax benefit (expense) 1.3 1.7
Ending balance 4.7 (3.0)
Unrealized Pension Costs    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (19.6) (15.4)
Other comprehensive gain (loss) before reclassifications 0.3 (0.2)
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0
Deferred income tax benefit (expense) 0.0 0.0
Ending balance (19.3) (15.6)
Total Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (161.1) (156.0)
Other comprehensive gain (loss) before reclassifications (1.2) 24.1
Amounts reclassified from accumulated other comprehensive loss (1.6) (10.4)
Deferred income tax benefit (expense) (8.5) (9.7)
Ending balance $ (172.4) $ (152.0)