Stock-Based Compensation Expense and Employee Benefit Plans - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Arrangements with Employees and Nonemployees [Abstract]
Granted (in dollars per share)		$ 7.30
Stock options exercised, intrinsic value	$ 28.9	$ 11.2	$ 2.6
Unrecognized compensation cost related to unvested stock options	$ 6.2	$ 20.7
Expense expected to be recognized over remaining weighted-average period	10 months 24 days	1 year 9 months 18 days
Cash received from stock options exercised	$ 79.7	$ 15.0
Class A common stock
Share-based Arrangements with Employees and Nonemployees [Abstract]
Granted (in shares)	0	200,000
Employee Stock Option
Share-based Arrangements with Employees and Nonemployees [Abstract]
Allocated share-based compensation expense	$ 15.6	$ 19.1