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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 04, 2021
Mar. 21, 2021
Share-based Payment Arrangement [Abstract]            
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)         4,500,000 1,235,669
Share-based payment arrangement, expense $ 21.7 $ 17.9 $ 60.3 $ 44.6