Investment Information - Equity method investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 3,565,946	$ 3,077,611
Credit related funds
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	1,135,623	1,022,334
Private equity
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	761,997	436,042
Real estate
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	474,666	396,395
Lending
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	454,196	376,649
Equity securities
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	261,650	395,090
Infrastructure
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	236,920	230,070
Energy
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	113,778	119,141
Fixed income
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 127,116	$ 101,890