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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
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax        
Beginning balance $ 4,658.4 $ 4,574.3 $ 3,901.1 $ 4,148.3
Other comprehensive gain (loss) before reclassifications 8.3   12.3  
Amounts reclassified from accumulated other comprehensive loss 6.8   (8.6)  
Deferred income tax (expense) benefit (2.3)   2.2  
Ending balance 5,133.3 4,658.4 3,839.1 3,901.1
Foreign Currency Translation Adjustments        
AOCI Attributable to Parent, Net of Tax        
Beginning balance (154.6) (122.4) (152.5) (154.8)
Other comprehensive gain (loss) before reclassifications 12.9 (30.2) 1.2 11.6
Amounts reclassified from accumulated other comprehensive loss (1.5) (1.6) (1.6) (1.7)
Deferred income tax (expense) benefit (0.9) (0.4) 2.1 (7.6)
Ending balance (144.1) (154.6) (150.8) (152.5)
Unrealized Loss on Hedges        
AOCI Attributable to Parent, Net of Tax        
Beginning balance (3.2) (27.7) 19.1 12.5
Other comprehensive gain (loss) before reclassifications (3.4) 34.8 (3.7) 19.0
Amounts reclassified from accumulated other comprehensive loss 7.2 (0.9) (7.2) (8.6)
Deferred income tax (expense) benefit (1.4) (9.4) 3.6 (3.8)
Ending balance (0.8) (3.2) 11.8 19.1
Unrealized Gain on Available-for-sale Investments        
AOCI Attributable to Parent, Net of Tax        
Beginning balance 4.7 8.6 (3.0) 1.7
Other comprehensive gain (loss) before reclassifications (1.0) (6.1) 14.8 (6.3)
Amounts reclassified from accumulated other comprehensive loss 1.1 0.9 0.2 (0.1)
Deferred income tax (expense) benefit 0.0 1.3 (3.5) 1.7
Ending balance 4.8 4.7 8.5 (3.0)
Unrealized Pension Costs        
AOCI Attributable to Parent, Net of Tax        
Beginning balance (19.3) (19.6) (15.6) (15.4)
Other comprehensive gain (loss) before reclassifications (0.2) 0.3 0.0 (0.2)
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.0 0.0
Deferred income tax (expense) benefit 0.0 0.0 0.0 0.0
Ending balance (19.5) (19.3) (15.6) (15.6)
Total Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax        
Beginning balance (172.4) (161.1) (152.0) (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 (expense) benefit   (8.5)   (9.7)
Ending balance $ (159.6) $ (172.4) $ (146.1) $ (152.0)