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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 31, 2018
Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Beginning balance $ 2,956.2 $ 2,619.0 $ 2,503.1    
Impact to AOCI from adoption of ASUs     9.3   $ 2.6
Adjusted beginning balance     2,628.3   2,958.8
Other comprehensive (loss) income before reclassifications 2.9 42.0 (8.5)    
Amounts reclassified from accumulated other comprehensive loss 15.3 (8.5) (6.9)    
Deferred income tax benefit (expense) (16.2) 32.2 (0.4)    
Ending balance 3,140.4 2,956.2 2,619.0    
Foreign Currency Translation Adjustments          
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Beginning balance (100.1) (197.6) (181.5)    
Impact to AOCI from adoption of ASUs         (4.9)
Adjusted beginning balance       $ (105.0)  
Other comprehensive (loss) income before reclassifications (36.7) 84.1 (17.6)    
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.0    
Deferred income tax benefit (expense) (1.9) 13.4 1.5    
Ending balance (143.6) (100.1) (197.6)    
Unrealized Gain (Loss) on Hedges          
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Beginning balance (13.9) 16.7 11.8    
Impact to AOCI from adoption of ASUs         (2.9)
Adjusted beginning balance       (16.8)  
Other comprehensive (loss) income before reclassifications   (43.5) 16.1    
Amounts reclassified from accumulated other comprehensive loss   (6.5) (8.0)    
Deferred income tax benefit (expense)   19.4 (3.2)    
Ending balance   (13.9) 16.7    
Unrealized Gain (Loss) on Hedges          
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Other comprehensive (loss) income before reclassifications 35.1        
Amounts reclassified from accumulated other comprehensive loss 19.1        
Deferred income tax benefit (expense) (13.8)        
Ending balance 23.6        
Unrealized (Loss) Gain on Available-for-sale Investments          
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Beginning balance (4.6) 0.1 (1.5)    
Impact to AOCI from adoption of ASUs         0.0
Adjusted beginning balance       (4.6)  
Other comprehensive (loss) income before reclassifications (3.1) (8.3) 0.7    
Amounts reclassified from accumulated other comprehensive loss 2.9 3.1 1.1    
Deferred income tax benefit (expense) (0.2) 0.5 (0.2)    
Ending balance (5.0) (4.6) 0.1    
Unrealized Pension Costs          
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Beginning balance (14.1) (17.6) (11.4)    
Impact to AOCI from adoption of ASUs         0.0
Adjusted beginning balance       (14.1)  
Other comprehensive (loss) income before reclassifications 7.6 9.7 (7.7)    
Amounts reclassified from accumulated other comprehensive loss (6.7) (5.1) 0.0    
Deferred income tax benefit (expense) (0.3) (1.1) 1.5    
Ending balance (13.5) (14.1) (17.6)    
Total Accumulated Other Comprehensive Loss          
Accumulated Other Comprehensive Income (Loss), Net of Tax          
Beginning balance (132.7) (198.4) (182.6)    
Impact to AOCI from adoption of ASUs         (7.8)
Adjusted beginning balance     (198.4) $ (140.5) $ (140.5)
Ending balance $ (138.5) $ (132.7) $ (198.4)