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Comprehensive Income - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Components of Accumulated other comprehensive income, net of taxes    
Beginning Balance $ 4,134.9 $ 4,578.5
Other comprehensive income, net of tax 8.7 29.4
Ending Balance 3,760.3 4,422.6
Foreign Currency Translation Adjustment    
Components of Accumulated other comprehensive income, net of taxes    
Beginning Balance (188.0)  
Other comprehensive income before reclassifications 7.5  
Amounts reclassified 0.0  
Other comprehensive income, net of tax 7.5 29.1
Ending Balance (180.5)  
Realized and Unrealized Gains (Losses) on Derivative Securities    
Components of Accumulated other comprehensive income, net of taxes    
Beginning Balance (0.5)  
Other comprehensive income before reclassifications 1.1  
Amounts reclassified 0.1  
Other comprehensive income, net of tax 1.2 $ 0.3
Ending Balance 0.7  
Total    
Components of Accumulated other comprehensive income, net of taxes    
Beginning Balance (188.5)  
Other comprehensive income before reclassifications 8.6  
Amounts reclassified 0.1  
Other comprehensive income, net of tax 8.7  
Ending Balance $ (179.8)