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Investments - Schedule of Alternative Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value $ 431,999 $ 395,779
Private equity    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 337,905 301,759
Remaining Commitment 191,411 131,885
Maximum Exposure to Loss 529,316 433,644
Private credit    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 50,236 54,500
Remaining Commitment 96,702 89,401
Maximum Exposure to Loss 146,938 143,901
Real assets    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 43,858 39,520
Remaining Commitment 41,439 33,040
Maximum Exposure to Loss 85,297 72,560
Total alternative investments    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 431,999 395,779
Remaining Commitment 329,552 254,326
Maximum Exposure to Loss $ 761,551 $ 650,105