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Comprehensive Income - Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)      
Pre-Tax $ 23.6 $ (9.7) $ (87.1)
Tax Expense (9.9) 22.3 (15.1)
Other comprehensive income (loss), net of tax 13.7 12.6 (102.2)
Foreign currency translation loss      
Accumulated Other Comprehensive Income (Loss)      
Pre-Tax 25.5 (11.4) (87.0)
Tax Expense (10.3) 22.3 (15.1)
Other comprehensive income (loss), net of tax 15.2 10.9 (102.1)
Change in net realized and unrealized loss on derivative financial instruments      
Accumulated Other Comprehensive Income (Loss)      
Pre-Tax (1.9) 1.7 (0.1)
Tax Expense 0.4 0.0 0.0
Other comprehensive income (loss), net of tax $ (1.5) $ 1.7 $ (0.1)