Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) investment	Dec. 31, 2024 USD ($)
Derivative [Line Items]
Cash collateral received	$ 5,500,000	$ 10,400,000
Return of cash collateral into brokerage accounts	10,300,000	5,200,000
Institutional investment advisory and services fees receivable	139,755,000	159,336,000
Variable Interest Entity, Primary Beneficiary
Derivative [Line Items]
Other derivative instruments	0	0
Gains (Losses)	(200,000)	0
Cash collateral received	0	2,000
Return of cash collateral into brokerage accounts	500,000	300,000
Return of cash collateral into brokerage accounts	492,000	85,000
VOEs
Derivative [Line Items]
Gains (Losses)	0	0
Cash collateral received	0	0
Futures, forwards and swaps held	0	11,500,000
Return of cash collateral into brokerage accounts	0	0
Variable Interest Entity, Not Primary Beneficiary
Derivative [Line Items]
Net assets	51,300,000,000	46,900,000,000
Maximum risk of loss in investment in VIEs	40,400,000	17,300,000
Institutional investment advisory and services fees receivable	$ 105,100,000	115,200,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | investment	4
Investment owned at fair value, deconsolidated amount		$ 53,900,000