Investments - Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments [Abstract]
Realized gains (losses)	$ (80.8)	$ (29.6)	$ 9.6
Net change in unrealized gains (losses)	327.7	(378.5)	67.0
Total	$ 246.9	$ (408.1)	$ 76.6