Stockholders' Equity - Restricted Stock Units - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected weighted average period to recognize unrecognized stock compensation expense			1 year 10 months 2 days
Restricted Stock Units
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Grant-date fair value of restricted stock units granted			$ 176.9	$ 127.3
Unrecognized stock compensation expense	$ 343.7		$ 343.7
Expected weighted average period to recognize unrecognized stock compensation expense			2 years 5 months 4 days
Fair value of restricted stock units vested	$ 21.6	$ 10.6	$ 59.2	$ 28.2