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Changes in Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning $ 3,194.1 $ 2,801.0 $ 1,845.0
Other comprehensive income (loss) prior to reclassifications (19.5) (0.6)  
Amounts reclassified from accumulated other comprehensive loss 3.1 3.3  
Other comprehensive income (loss), net of tax (16.4) 2.7 9.6
Balance, ending 3,324.1 3,194.1 2,801.0
Effects of cash flow hedges, tax amount (4.4)    
Effects of cash flow hedges, tax amount   0.5  
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning (42.5) (43.2)  
Other comprehensive income (loss) prior to reclassifications 0.1 0.7  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Other comprehensive income (loss), net of tax 0.1 0.7  
Balance, ending (42.4) (42.5) (43.2)
Effects of Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning 4.6 2.6  
Other comprehensive income (loss) prior to reclassifications   (1.3)  
Amounts reclassified from accumulated other comprehensive loss   3.3  
Other comprehensive income (loss), net of tax   2.0  
Balance, ending   4.6 2.6
Effects of Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other comprehensive income (loss) prior to reclassifications (19.6)    
Amounts reclassified from accumulated other comprehensive loss 3.1    
Other comprehensive income (loss), net of tax (16.5)    
Balance, ending (11.9)    
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning (37.9) (40.6) (50.2)
Balance, ending $ (54.3) $ (37.9) $ (40.6)