Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) fund	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Derivative [Line Items]
Net (losses) on derivative instruments	$ (4,879,000)	$ (15,285,000)	$ (28,729,000)	$ (21,865,000)
Cash collateral payable to trade counterparties	8,200,000		8,200,000		$ 10,400,000
Cash collateral received	11,000,000.0		11,000,000.0		5,200,000
Advisory fee receivables	140,174,000		140,174,000		159,336,000
VIEs
Derivative [Line Items]
Other derivative instruments	200,000		200,000		0
Net (losses) on derivative instruments	100,000	700,000	(300,000)	(200,000)
Cash collateral payable to trade counterparties	13,000		13,000		2,000
Delivery of cash collateral	400,000		400,000		300,000
Cash collateral received	404,000		404,000		85,000
VOEs
Derivative [Line Items]
Futures, forwards and swaps held	39,000		39,000		11,500,000
Net (losses) on derivative instruments	0	$ 0	0	$ 0
Cash collateral payable to trade counterparties	0		0		0
Cash collateral received	0		0		0
Non-consolidated VIEs
Derivative [Line Items]
Net assets	47,500,000,000		47,500,000,000		46,900,000,000
Maximum risk of loss in investment in VIEs	37,500,000		37,500,000		17,300,000
Advisory fee receivables	$ 90,700,000		$ 90,700,000		115,200,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | fund			4
Seed investment, deconsolidated amount					$ 53,900,000