Accrued Compensation and Benefits - Performance Allocations and Incentive-Fee Related Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Realized	$ 1,026.4	$ 1,414.5	$ 337.2
Unrealized	(306.5)	1,546.5	441.9
Total	$ 719.9	$ 2,961.0	$ 779.1