Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) fund	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (1,630,000)	$ (861,000)	$ (6,580,000)	$ (11,355,000)
Cash collateral payable to trade counterparties	7,400,000		7,400,000		$ 5,700,000
Cash collateral received	4,100,000		4,100,000		7,800,000
Maximum risk of loss in investment in VIEs					10,300,000
Advisory fee receivables	124,925,000		124,925,000		125,500,000
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	400,000		400,000		2,400,000
Gains (losses) on derivative instruments	(500,000)	$ (1,300,000)	(900,000)	400,000
Cash collateral payable to trade counterparties, gross	800,000		800,000		1,400,000
Cash collateral received, gross	1,300,000		1,300,000		1,400,000
Cash collateral payable to trade counterparties	564,000		564,000		1,415,000
Cash collateral received	159,000		159,000		1,408,000
VOEs
Derivative [Line Items]
Futures, forwards and swaps held	0		0		8,800,000
Gains (losses) on derivative instruments			0	$ 0
Cash collateral payable to trade counterparties	0		0
Cash collateral received	0		0
Non-consolidated VIEs
Derivative [Line Items]
Net assets	67,000,000,000.0		67,000,000,000.0		54,600,000,000
Maximum risk of loss in investment in VIEs	14,300,000		14,300,000
Advisory fee receivables	$ 103,700,000		$ 103,700,000		114,500,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund			4
Seed investment, deconsolidated amount					$ 46,500,000