Consolidated Company-Sponsored Investment Funds - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) fund	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Gains (losses) on derivative instruments	$ 22,099	$ (11,414)	$ 41,831	$ (9,078)
Cash collateral payable to trade counterparties	9,200		9,200		$ 2,900
Cash collateral received	3,000		3,000		5,600
Advisory fee receivables	146,069		146,069		185,653
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	16,600		16,600		12,500
Gains (losses) on derivative instruments	(5,700)	$ 1,800	(5,200)	$ 700
Cash collateral payable to trade counterparties	871		871		904
Cash collateral received	4,001		4,001		1,824
Variable Interest Entity, Not Primary Beneficiary
Derivative [Line Items]
Net assets	40,300,000		40,300,000		68,900,000
Maximum risk of loss in investment in VIEs	4,700		4,700		8,800
Advisory fee receivables	$ 47,400		$ 47,400		75,700
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund			5
Seed investment, deconsolidated amount					$ 61,800