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ACCUMULATED OTHER COMPREHENSIVE LOSS - Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax    
Beginning balance $ 5,835.9 $ 4,574.3
Other comprehensive gain (loss) before reclassifications (30.3) (1.2)
Amounts reclassified from accumulated other comprehensive loss (4.1) (1.6)
Deferred income tax (expense) benefit 5.5 (8.5)
Ending balance 5,844.9 4,658.4
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (172.5) (122.4)
Other comprehensive gain (loss) before reclassifications (7.4) (30.2)
Amounts reclassified from accumulated other comprehensive loss (1.6) (1.6)
Deferred income tax (expense) benefit (1.0) (0.4)
Ending balance (182.5) (154.6)
Unrealized Gain on Hedges    
AOCI Attributable to Parent, Net of Tax    
Beginning balance 29.7 (27.7)
Other comprehensive gain (loss) before reclassifications 24.7 34.8
Amounts reclassified from accumulated other comprehensive loss (7.3) (0.9)
Deferred income tax (expense) benefit (4.0) (9.4)
Ending balance 43.1 (3.2)
Unrealized Loss on Available-for-sale Investments    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (6.9) 8.6
Other comprehensive gain (loss) before reclassifications (47.6) (6.1)
Amounts reclassified from accumulated other comprehensive loss 4.8 0.9
Deferred income tax (expense) benefit 10.5 1.3
Ending balance (39.2) 4.7
Unrealized Pension Costs    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (8.0) (19.6)
Other comprehensive gain (loss) before reclassifications 0.0 0.3
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0
Deferred income tax (expense) benefit 0.0 0.0
Ending balance (8.0) (19.3)
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (157.7) (161.1)
Ending balance $ (186.6) $ (172.4)