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Comprehensive Income - Components of AOCL (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of Accumulated other comprehensive income, net of taxes      
Beginning balance $ 3,317.3 $ 3,499.1 $ 4,134.9
Other comprehensive income (loss) before reclassifications 6.6 14.3  
Amounts reclassified 0.6 (0.6)  
Other comprehensive income, net of tax 7.2 13.7 12.6
Ending balance 3,710.6 3,317.3 3,499.1
Total      
Components of Accumulated other comprehensive income, net of taxes      
Beginning balance (162.2) (175.9)  
Ending balance (155.0) (162.2) (175.9)
Foreign Currency Translation Adjustment      
Components of Accumulated other comprehensive income, net of taxes      
Beginning balance (161.9) (177.1)  
Other comprehensive income (loss) before reclassifications 6.8 15.2  
Amounts reclassified 0.0 0.0  
Other comprehensive income, net of tax 6.8 15.2 10.9
Ending balance (155.1) (161.9) (177.1)
Realized and Unrealized Gains (Losses) on Derivative Financial Instruments      
Components of Accumulated other comprehensive income, net of taxes      
Beginning balance (0.3) 1.2  
Other comprehensive income (loss) before reclassifications (0.2) (0.9)  
Amounts reclassified 0.6 (0.6)  
Other comprehensive income, net of tax 0.4 (1.5) 1.7
Ending balance $ 0.1 $ (0.3) $ 1.2