Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	$ 15,339	$ 14,518
Derivatives	10,964	18,180
Total liabilities measured at fair value	266,130	270,870
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	32	1
Total assets measured at fair value	351,324	268,610
Derivatives	556	3,511
Total liabilities measured at fair value	556	3,511
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	15,307	14,517
Total assets measured at fair value	611,571	914,300
Derivatives	10,408	14,669
Total liabilities measured at fair value	10,408	14,669
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	116	118
Total liabilities measured at fair value	255,166	252,690
Company-Sponsored Investment Funds | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	253,634	410,851
Total liabilities measured at fair value	159	2,531
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	30,634	60,630
Total liabilities measured at fair value	99	944
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	223,000	350,221
Total liabilities measured at fair value	60	1,587
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	0	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	564	4,902
Derivatives	159	2,531
VIEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	157,618	286,619
Derivatives - VIEs	564	4,902
Derivatives	159	2,531
VIEs | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	16,392	49,455
Derivatives - VIEs	457	2,139
Derivatives	99	944
VIEs | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	141,226	237,164
Derivatives - VIEs	107	2,763
Derivatives	60	1,587
VIEs | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0	0
Derivatives - VIEs	0	0
Derivatives	0	0
VOEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	95,452	110,555
Derivatives - VIEs		8,775
VOEs | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	13,785	9,036
Derivatives - VIEs		0
VOEs | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	81,667	101,519
Derivatives - VIEs		8,775
VOEs | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	$ 0	0
Derivatives - VIEs		$ 0