Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	$ 800	$ 7,552
Derivatives	2,305	21,540
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	18,261	24,712
Derivatives	14,665	13,712
Total liabilities measured at fair value	264,519	261,021
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	135,099	136,344
Derivatives - VIEs	1,517	1,768
Total assets measured at fair value	288,314	233,633
Derivatives	1,226	162
Total liabilities measured at fair value	1,226	162
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	28,217	27,799
Derivatives - VIEs	16,744	22,944
Total assets measured at fair value	923,196	1,572,448
Derivatives	13,439	13,550
Total liabilities measured at fair value	13,439	13,550
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	121	129
Derivatives - VIEs	0	0
Total assets measured at fair value	121	129
Derivatives	0	0
Total liabilities measured at fair value	249,854	247,309
Recurring | Company-sponsored investment funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	322,727	524,088
Total liabilities measured at fair value	2,305	21,540
Recurring | Company-sponsored investment funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	69,795	131,235
Total liabilities measured at fair value	614	14,932
Recurring | Company-sponsored investment funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	252,932	392,853
Total liabilities measured at fair value	1,691	6,608
Recurring | Company-sponsored investment funds | Level 3
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
Recurring | VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	306,500	516,536
Derivatives - VIEs	800	7,552
Derivatives	2,305	21,540
Recurring | VIEs | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	54,019	129,706
Derivatives - VIEs	349	1,529
Derivatives	614	14,932
Recurring | VIEs | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	252,481	386,830
Derivatives - VIEs	451	6,023
Derivatives	1,691	6,608
Recurring | VIEs | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0	0
Derivatives - VIEs	0	0
Derivatives	0	$ 0
Recurring | VOEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	15,427
Recurring | VOEs | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	15,427
Recurring | VOEs | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0
Recurring | VOEs | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	$ 0