Consolidated Company-Sponsored Investment Funds - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) investment	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Cash collateral payable to trade counterparties	$ 5,700,000	$ 8,400,000
Cash collateral received	7,800,000	4,200,000
Net assets		46,400,000,000
Maximum risk of loss in investment in VIEs	10,300,000	5,700,000
Institutional investment advisory and services fees receivable	$ 125,500,000	127,040,000
Seed capital
Derivative [Line Items]
Number of deconsolidated funds | investment	5
Investment owned at fair value, deconsolidated amount		77,300,000
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	$ (2,400,000)	(14,000,000)
Gains (losses) on derivatives	100,000	(9,400,000)
Cash collateral payable to trade counterparties	1,415,000	2,731,000
Cash collateral received	1,408,000	5,444,000
Variable Interest Entity, Not Primary Beneficiary
Derivative [Line Items]
Net assets	54,600,000,000
Institutional investment advisory and services fees receivable	114,500,000	$ 54,200,000
VOEs
Derivative [Line Items]
Futures, forwards and swaps held	(8,800,000)
Gains (losses) on derivatives	(100,000)
Cash collateral payable to trade counterparties	0
Cash collateral received	$ 0