Investments - Net Investment Income (Losses) of Consolidated Funds (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments [Abstract]
Gains (losses) from investments of Consolidated Funds	$ 246.9	$ (408.1)	$ 76.6
Gains (losses) from liabilities of CLOs	(240.0)	366.6	(74.1)
Total	$ 6.9	$ (41.5)	$ 2.5