Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Recurring
Variable Interest Entity [Line Items]
Derivatives	$ 15,422	$ 21,741
Derivatives	16,923	30,537
Total liabilities measured at fair value	59,011	76,078
Level 1 | Recurring
Variable Interest Entity [Line Items]
Investments	155,904	162,243
Derivatives	392	118
Total assets measured at fair value	307,452	293,036
Derivatives	1,186	1,834
Total liabilities measured at fair value	5,014	19,625
Level 2 | Recurring
Variable Interest Entity [Line Items]
Investments	39,284	17,565
Derivatives	15,030	21,623
Total assets measured at fair value	1,558,142	1,792,094
Derivatives	15,737	28,703
Total liabilities measured at fair value	15,737	28,703
Level 3 | Recurring
Variable Interest Entity [Line Items]
Investments	126	125
Derivatives	0	0
Total assets measured at fair value	126	125
Derivatives	0	0
Total liabilities measured at fair value	38,260	27,750
Consolidated company-sponsored investment funds | Recurring
Variable Interest Entity [Line Items]
Total assets measured at fair value	618,912	306,270
Total liabilities measured at fair value	18,342	7,557
Consolidated company-sponsored investment funds | Level 1 | Recurring
Variable Interest Entity [Line Items]
Total assets measured at fair value	166,037	74,351
Total liabilities measured at fair value	16,291	1,649
Consolidated company-sponsored investment funds | Level 2 | Recurring
Variable Interest Entity [Line Items]
Total assets measured at fair value	449,518	231,300
Total liabilities measured at fair value	2,051	5,908
Consolidated company-sponsored investment funds | Level 3 | Recurring
Variable Interest Entity [Line Items]
Total assets measured at fair value	3,357	619
Total liabilities measured at fair value	0	0
VIEs
Variable Interest Entity [Line Items]
Derivatives	5,887	3,224
Derivatives	18,342	6,893
VIEs | Recurring
Variable Interest Entity [Line Items]
Investments	613,025	242,541
Derivatives	5,887	3,224
Derivatives	18,342	6,893
VIEs | Level 1 | Recurring
Variable Interest Entity [Line Items]
Investments	165,415	73,909
Derivatives	622	442
Derivatives	16,291	1,649
VIEs | Level 2 | Recurring
Variable Interest Entity [Line Items]
Investments	444,253	168,114
Derivatives	5,265	2,782
Derivatives	2,051	5,244
VIEs | Level 3 | Recurring
Variable Interest Entity [Line Items]
Investments	3,357	518
Derivatives	0	0
Derivatives	0	0
VOEs
Variable Interest Entity [Line Items]
Derivatives	0	464
Derivatives	0	664
VOEs | Recurring
Variable Interest Entity [Line Items]
Investments	0	60,041
Derivatives	0	464
Derivatives	0	664
VOEs | Level 1 | Recurring
Variable Interest Entity [Line Items]
Investments	0	0
Derivatives	0	0
Derivatives	0	0
VOEs | Level 2 | Recurring
Variable Interest Entity [Line Items]
Investments	0	59,940
Derivatives	0	464
Derivatives	0	664
VOEs | Level 3 | Recurring
Variable Interest Entity [Line Items]
Investments	0	101
Derivatives	0	0
Derivatives	$ 0	$ 0