Stock-Based Compensation and Employee Benefit Plan - Stock Options (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Arrangements with Employees and Nonemployees [Abstract]
Granted (in dollars per share)	$ 7.30	$ 5.60
Unrecognized compensation cost related to unvested stock options	$ 20.7	$ 41.9
Expense expected to be recognized over remaining weighted-average period	1 year 9 months 18 days	2 years 9 months 18 days
Cash received from Stock options exercised	$ 15.0	$ 1.5
Class A common stock
Share-based Arrangements with Employees and Nonemployees [Abstract]
Granted options (in shares)	200,000	4,956,064
Granted (in dollars per share)	$ 7.30	$ 5.60
Employee Stock Option
Share-based Arrangements with Employees and Nonemployees [Abstract]
Allocated share-based compensation expense	$ 19.1	$ 36.2	$ 33.3
Stock options exercised, intrinsic value	$ 11.2	$ 2.6	$ 9.2