Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) investment	Dec. 31, 2023 USD ($)
Derivative [Line Items]
Cash collateral received	$ 10,400,000	$ 5,700,000
Return of cash collateral into brokerage accounts	5,200,000	7,800,000
Net assets		54,600,000,000
Maximum risk of loss in investment in VIEs	17,300,000	10,300,000
Institutional investment advisory and services fees receivable	159,336,000	125,500,000
Variable Interest Entity, Primary Beneficiary
Derivative [Line Items]
Futures, forwards and swaps held	0	(2,400,000)
Gains (Losses)	0	100,000
Cash collateral received	2,000	1,415,000
Return of cash collateral into brokerage accounts	300,000
Return of cash collateral into brokerage accounts	85,000	1,408,000
VOEs
Derivative [Line Items]
Futures, forwards and swaps held	11,500,000	8,800,000
Gains (Losses)	0	100,000
Cash collateral received	0	0
Return of cash collateral into brokerage accounts	0	0
Variable Interest Entity, Not Primary Beneficiary
Derivative [Line Items]
Net assets	46,900,000,000
Institutional investment advisory and services fees receivable	$ 115,200,000	114,500,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | investment	9
Investment owned at fair value, deconsolidated amount		$ 129,000,000