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Investments - Schedule of Aggregated Income Statement Summarized Financial Information for Partnerships in our Alternative Investment Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]        
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income $ 138,655 $ 117,759 $ 387,314 $ 334,250
Investments Accounted for Under the Equity Method        
Schedule of Equity Method Investments [Line Items]        
Net investment income (loss) (192,100) 230,600 460,000 127,000
Realized gains 4,429,600 1,878,300 5,992,200 5,263,400
Net change in unrealized appreciation (depreciation) (1,919,700) 607,700 935,700 7,277,000
Net income 2,317,800 2,716,600 7,387,900 12,667,400
Alternative investments        
Schedule of Equity Method Investments [Line Items]        
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income $ 11,769 $ 9,031 $ 22,852 $ 26,429