Investment Information - Other investments by strategy (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	$ 1,973,550	$ 3,824,796
Other investments
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	1,432,553	2,331,885
Other investments | Lending
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	536,345	572,636
Other investments | Term loan investments
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	484,950	1,231,731
Other investments | Investment grade fixed income
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	147,810	138,646
Other investments | Private equity
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	91,126	48,750
Other investments | Energy
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	81,692	65,813
Other investments | Credit related funds
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	70,278	90,780
Other investments | Infrastructure
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	20,352	165,516
Other investments | Real estate
Schedule Of Other Investments [Line Items]
Investments accounted for using the fair value option	$ 0	$ 18,013