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Investments - Summary of Selected Financial information for Hildene (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2025
Dec. 31, 2024
May 31, 2025
Mar. 31, 2025
Nov. 30, 2024
Sep. 30, 2024
May 31, 2024
Schedule of Equity Method Investments [Line Items]              
Total assets     $ 67,285,344   $ 64,360,309    
Total liabilities     56,902,764   54,134,916    
Total members’ equity     $ 10,382,174   $ 10,224,987   $ 9,952,186
Hildene Insurance Holdings, LLC              
Schedule of Equity Method Investments [Line Items]              
Net increase in members’ equity resulting from operations $ 27,500 $ 8,400          
Hildene Insurance Holdings, LLC              
Schedule of Equity Method Investments [Line Items]              
Total assets       $ 447,900   $ 304,200  
Total liabilities       100   200  
Total members’ equity       $ 447,800   $ 304,000