Investment Information - Equity method investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 3,496,341	$ 3,077,611
Credit related funds
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	1,119,711	1,022,334
Private equity
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	646,904	436,042
Real estate
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	455,044	396,395
Lending
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	447,028	376,649
Equity securities
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	350,587	395,090
Infrastructure
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	231,816	230,070
Energy
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	115,514	119,141
Fixed income
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 129,737	$ 101,890