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Comprehensive Income - Summary of the Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax $ (42.2) $ (4.3)
Tax Expense (11.7) 13.0
Other comprehensive income (loss), net of tax (53.9) 8.7
Foreign currency translation gain (loss)    
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax (41.0) (5.5)
Tax Expense (11.9) 13.0
Other comprehensive income (loss), net of tax (52.9) 7.5
Change in net realized and unrealized gain (loss) on derivative financial instruments    
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax (1.2) 1.2
Tax Expense 0.2 0.0
Other comprehensive income (loss), net of tax $ (1.0) $ 1.2