Consolidated Company-Sponsored Investment Funds - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) fund	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Gains (losses) on derivative instruments	$ 19,732	$ 2,336
Cash collateral payable to trade counterparties	7,800		$ 2,900
Cash collateral received	6,500		5,600
Advisory fee receivables	177,381		185,653
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	14,500		12,500
Gains (losses) on derivative instruments	500	$ (1,100)
Cash collateral payable to trade counterparties	1,524		904
Cash collateral received	2,486		1,824
Variable Interest Entity, Not Primary Beneficiary
Derivative [Line Items]
Net assets	59,100,000		68,900,000
Maximum risk of loss in investment in VIEs	15,100		8,800
Advisory fee receivables	$ 70,300		$ 75,700
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund	3
Seed investment, deconsolidated amount	$ 55,100