Stock-Based Compensation and Other Employee Benefit Plans - Restricted Shares, Narrative (Details) - Restricted Shares - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Stock-based compensation awards, unearned compensation	$ 49.1		$ 49.1
Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years)			1 year 10 months 24 days
Stock-based compensation, vested awards, intrinsic value	$ 0.3	$ 0.3	$ 78.3	$ 19.5