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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Provision (benefit) for income taxes $ (0.9) $ 7.0 $ 7.3 $ 9.6  
Unrecognized tax benefits $ 20.0   $ 20.0   $ 20.1