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Stock-based Compensation - Unrecognized Compensation Costs (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Stock-based compensation  
Total unrecognized compensation cost related to non-vested stock option awards $ 149.5
Weighted-average period over which unrecognized compensation cost will be recognized 2 years 11 months 19 days
Restricted stock units  
Stock-based compensation  
Total unrecognized compensation cost related to non-vested stock awards $ 65.8
Weighted-average period over which unrecognized compensation cost will be recognized 3 years 7 months 13 days