Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	$ 4,628	$ 5,887
Derivatives	21,376	18,342
VOEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	9	0
Derivatives	0	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	37,348	15,422
Derivatives	11,758	16,923
Total liabilities measured at fair value	285,146	59,011
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	124,124	155,904
Derivatives - VIEs	8,053	392
Total assets measured at fair value	294,568	307,452
Derivatives	0	1,186
Total liabilities measured at fair value	243	5,014
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	24,680	39,284
Derivatives - VIEs	29,295	15,030
Total assets measured at fair value	1,389,082	1,558,142
Derivatives	11,758	15,737
Total liabilities measured at fair value	11,758	15,737
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	120	126
Derivatives - VIEs	0	0
Total assets measured at fair value	120	126
Derivatives	0	0
Total liabilities measured at fair value	273,145	38,260
Recurring | Company-sponsored investment funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	476,257	618,912
Total liabilities measured at fair value	21,376	18,342
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	85,875	166,037
Total liabilities measured at fair value	16,525	16,291
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	390,382	449,518
Total liabilities measured at fair value	4,851	2,051
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	3,357
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	445,575	613,025
Derivatives - VIEs	4,628	5,887
Derivatives	21,376	18,342
Recurring | VIEs | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	83,699	165,415
Derivatives - VIEs	2,176	622
Derivatives	16,525	16,291
Recurring | VIEs | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	361,876	444,253
Derivatives - VIEs	2,452	5,265
Derivatives	4,851	2,051
Recurring | VIEs | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0	3,357
Derivatives - VIEs	0	0
Derivatives	0	$ 0
Recurring | VOEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	26,045
Derivatives - VIEs	9
Recurring | VOEs | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0
Derivatives - VIEs	0
Recurring | VOEs | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	26,045
Derivatives - VIEs	9
Recurring | VOEs | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0
Derivatives - VIEs	$ 0