Stockholders' Equity - Restricted Stock Units - Additional Information (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Expected weighted average period to recognize unrecognized stock compensation expense | 1 year 9 months 10 days | ||
| Restricted Stock Units | |||
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Grant-date fair value of restricted stock units granted | $ 210.1 | $ 195.2 | $ 184.7 |
| Fair value of restricted stock units vested | 83.7 | $ 40.5 | $ 11.4 |
| Unrecognized stock compensation expense | $ 336.4 | ||
| Expected weighted average period to recognize unrecognized stock compensation expense | 2 years 3 months 3 days | ||