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Income Taxes - Other Tax Disclosure Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]          
Unrecognized Tax Benefits   $ 20.2 $ 41.1 $ 38.7 $ 47.7
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   (1.7) 4.4 1.0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   2.0 $ 11.5 6.9 $ 7.5
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   19.0      
Tax Adjustments, Settlements, and Unusual Provisions $ 18.5        
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ 25.3 $ 12.2   $ 3.7