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Income Taxes - Unrecognized Tax Benefts (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits, beginning balance   $ 41.1 $ 38.7 $ 47.7
Increase in prior year tax positions   0.2 0.2 5.6
Decrease in prior year tax positions   (6.6) (3.1) (16.9)
Increase in current year tax positions   0.7 4.4 6.0
Settlement $ (25.3) (12.2)   (3.7)
Foreign currency remeasurement adjustment   (3.0) (0.9)  
Unrecognized tax benefits, ending balance   20.2 41.1 38.7
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]        
Unrecognized tax benefits, interest and penalties, beginning balance   11.5 6.9 7.5
Increase in prior year tax positions   0.0 4.5 3.5
Decrease in prior year tax positions   (1.7) (0.1) (2.5)
Increase in current year tax positions   0.0 0.0 0.0
Settlement   (6.3)   (1.6)
Foreign currency remeasurement adjustment   (1.5) 0.2  
Unrecognized tax benefits, interest and penalties, ending balance   $ 2.0 $ 11.5 $ 6.9