Consolidated Company-Sponsored Investment Funds - Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives
Cash Collateral Received	$ (7,700)	$ (5,700)
Derivatives
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization	Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization
Cash Collateral Pledged	$ (4,000)	$ (7,800)
VIEs
Derivatives
Gross Amounts of Recognized Assets	5,698	4,902
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Statement of Financial Condition	5,698	4,902
Financial Instruments Collateral	0	0
Cash Collateral Received	(725)	(1,415)
Net Amount	4,973	3,487
Derivatives
Gross Amounts of Recognized Liabilities	5,366	2,531
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	5,366	2,531
Financial Instruments Collateral	0	0
Cash Collateral Pledged	(1,679)	(1,408)
Net Amount	$ 3,687	$ 1,123