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Investments - Summary of Selected Financial information for Hildene (Details) - USD ($)
$ in Thousands
 1 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Feb. 28, 2026
Nov. 30, 2025
Feb. 28, 2025
Schedule of Equity Method Investments [Line Items]          
Total assets     $ 74,380,490 $ 76,012,347  
Total liabilities     63,718,356 65,369,738  
Total members’ equity     $ 10,661,728 $ 10,642,203 $ 10,268,439
Hildene Insurance Holdings, LLC          
Schedule of Equity Method Investments [Line Items]          
Total assets $ 564,600 $ 498,400      
Total liabilities 20,100 700      
Total members’ equity 544,500 497,700      
Hildene Insurance Holdings, LLC          
Schedule of Equity Method Investments [Line Items]          
Net increase in members’ equity resulting from operations $ 16,600 $ 8,400