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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]        
Effective tax rate (percent) 4.90% 12.40% 11.40% 13.20%
Provision (benefit) for income taxes $ 8.7 $ 18.4 $ 74.3 $ 82.3
Tax reserve release 17.7   $ 17.7  
Tax only discrete items $ 2.4