Consolidated Investment Products (CIP) - Investments Measured at NAV as a practical expedient (Details) - Investments in other private equity funds - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Fair Value	$ 255.3		$ 258.2
Total Unfunded Commitments	$ 110.1		$ 110.1
Weighted Average Remaining Term	6 years 7 months 6 days	6 years 8 months 12 days