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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Schedule of Equity Method Investments [Line Items]        
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income $ 127,968 $ 108,642 $ 248,659 $ 216,491
Investments Accounted For Under The Equity Method        
Schedule of Equity Method Investments [Line Items]        
Net investment income (loss) 251,400 242,400 652,100 (103,600)
Realized gains 950,600 1,554,200 1,562,600 3,385,100
Net change in unrealized appreciation (depreciation) 975,900 2,850,200 2,855,300 6,669,200
Net income 2,177,900 4,646,800 5,070,000 9,950,700
Alternative investments        
Schedule of Equity Method Investments [Line Items]        
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income $ 4,004 $ 10,517 $ 11,083 $ 17,398