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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]          
Liability for unrecognized tax benefits $ 10.7   $ 10.7   $ 17.8
Increase in unrecognized tax benefits     (7.1)    
Unrecognized tax benefits that would impact effective tax rate 9.5   9.5    
Anticipated decrease in unrecognized tax benefits within the next twelve months 0.4   0.4    
Income tax benefit $ 12.0 $ 17.6 17.5 $ 28.0  
Coronavirus Aid, Relief, And Economic Security Act (CARES Act)          
Unusual or Infrequent Item, or Both [Line Items]          
Income tax benefit     $ 14.7