Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) fund	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (15,285,000)	$ 8,936,000	$ (21,865,000)	$ (2,419,000)
Cash collateral payable to trade counterparties	7,800,000		7,800,000		$ 5,700,000
Cash collateral received	7,100,000		7,100,000		7,800,000
Maximum risk of loss in investment in VIEs					10,300,000
Advisory fee receivables	131,171,000		131,171,000		125,500,000
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	(100,000)		(100,000)		2,400,000
Gains (losses) on derivative instruments	700,000	(3,300,000)	(200,000)	(2,900,000)
Cash collateral payable to trade counterparties, gross	300,000		300,000		1,400,000
Cash collateral received, gross	400,000		400,000		1,400,000
Cash collateral payable to trade counterparties	271,000		271,000		1,415,000
Cash collateral received	414,000		414,000		1,408,000
VOEs
Derivative [Line Items]
Futures, forwards and swaps held	0		0		8,800,000
Gains (losses) on derivative instruments	0	$ 0	0	$ 0
Cash collateral payable to trade counterparties	0		0
Cash collateral received	0		0
Non-consolidated VIEs
Derivative [Line Items]
Net assets	74,000,000,000.0		74,000,000,000.0		54,600,000,000
Maximum risk of loss in investment in VIEs	17,500,000		17,500,000
Advisory fee receivables	$ 112,500,000		$ 112,500,000		114,500,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund			6
Seed investment, deconsolidated amount					$ 77,700,000