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Comprehensive Income - Components of Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning balance $ 3,499.1 $ 4,134.9 $ 4,578.5
Other comprehensive income (loss) before reclassifications 14.3 13.1  
Amounts reclassified (0.6) (0.5)  
Other comprehensive income (loss) 13.7 12.6 (102.2)
Ending balance 3,317.3 3,499.1 4,134.9
Total      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning balance (175.9) (188.5)  
Ending balance (162.2) (175.9) (188.5)
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning balance (177.1) (188.0)  
Other comprehensive income (loss) before reclassifications 15.2 10.9  
Amounts reclassified 0.0 0.0  
Other comprehensive income (loss) 15.2 10.9 (102.1)
Ending balance (161.9) (177.1) (188.0)
Realized and Unrealized Gains (Losses) on Derivative Financial Instruments      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning balance 1.2 (0.5)  
Other comprehensive income (loss) before reclassifications (0.9) 2.2  
Amounts reclassified (0.6) (0.5)  
Other comprehensive income (loss) (1.5) 1.7 (0.1)
Ending balance $ (0.3) $ 1.2 $ (0.5)