Accrued Compensation and Benefits - Performance Allocations and Incentive-Fee Related Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Realized	$ 1,414.5	$ 337.2	$ 219.1
Unrealized	1,546.5	441.9	217.6
Total	$ 2,961.0	$ 779.1	$ 436.7