Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	$ 14,014	$ 20,941
Derivatives	17,612	14,944
Total liabilities measured at fair value	26,174	24,329
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	75	2,835
Total assets measured at fair value	341,881	351,975
Derivatives	1,569	33
Total liabilities measured at fair value	1,569	33
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	13,939	18,106
Total assets measured at fair value	481,943	523,272
Derivatives	16,043	14,911
Total liabilities measured at fair value	16,043	14,911
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	0	0
Total assets measured at fair value	124	121
Derivatives	0	0
Total liabilities measured at fair value	8,562	9,385
Company-Sponsored Investment Funds | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	373,593	152,376
Total liabilities measured at fair value	19,686	85
Company-Sponsored Investment Funds | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	42,767	15,537
Total liabilities measured at fair value	1,127	72
Company-Sponsored Investment Funds | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	298,916	136,839
Total liabilities measured at fair value	18,559	13
Company-Sponsored Investment Funds | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	31,910	0
Total liabilities measured at fair value	0	0
VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	19,911	101
Derivatives	19,686	85
VIEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	320,922	82,027
Derivatives - VIEs	19,911	101
Derivatives	19,686	85
VIEs | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	35,276	15,240
Derivatives - VIEs	1,183	48
Derivatives	1,127	72
VIEs | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	253,736	66,787
Derivatives - VIEs	18,728	53
Derivatives	18,559	13
VIEs | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	31,910	0
Derivatives - VIEs	0	0
Derivatives	0	0
VOEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	39	11,483
VOEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	32,721	58,765
Derivatives - VIEs	39	11,483
VOEs | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	6,269	249
Derivatives - VIEs	39	0
VOEs | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	26,452	58,516
Derivatives - VIEs	0	11,483
VOEs | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0	0
Derivatives - VIEs	$ 0	$ 0