Investments - Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Investments [Abstract]
Realized losses	$ (23.4)	$ (21.5)	$ (44.6)	$ (38.9)
Net change in unrealized gains	23.6	17.6	127.5	180.0
Total	$ 0.2	$ (3.9)	$ 82.9	$ 141.1