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