Investments of Operating Entities and Consolidated Funds - Operating Entities - Equity Method Investment - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Equity Method Investment, Other than Temporary Impairment	$ 0	$ 0
Net gains (losses) on other investments	$ 5,600,000	$ 12,600,000

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration