Investments - Schedule of Performance Allocations Included in Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Investments [Line Items]
Total	$ 1,786.1	$ (937.6)
Global Private Equity
Schedule of Investments [Line Items]
Total	1,566.5	(809.3)
Global Credit
Schedule of Investments [Line Items]
Total	21.0	(63.0)
Investment Solutions
Schedule of Investments [Line Items]
Total	$ 198.6	$ (65.3)