Consolidated Company-Sponsored Investment Funds - Offsetting of Derivative Assets and Liabilities (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Derivatives
Cash Collateral Received	$ (8,200,000)	$ (10,400,000)
Derivatives
Cash Collateral Pledged	(11,000,000.0)	(5,200,000)
VIEs
Derivatives
Gross Amounts of Recognized Assets	19,911,000	101,000
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Statement of Financial Condition	19,911,000	101,000
Financial Instruments Collateral	0	0
Cash Collateral Received	(13,000)	(2,000)
Net Amount	19,898,000	99,000
Derivatives
Gross Amounts of Recognized Liabilities	19,686,000	85,000
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	19,686,000	85,000
Financial Instruments Collateral	0	0
Cash Collateral Pledged	(404,000)	(85,000)
Net Amount	19,282,000	0
VOEs
Derivatives
Gross Amounts of Recognized Assets	39,000	11,483,000
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Statement of Financial Condition	39,000	11,483,000
Financial Instruments Collateral	0	0
Cash Collateral Received	0	0
Net Amount	39,000	11,483,000
Derivatives
Cash Collateral Pledged	$ 0	$ 0