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Basis of Presentation and Significant Accounting Policies (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
segment
Dec. 31, 2023
Oct. 25, 2023
USD ($)
Basis of Presentation      
Number of reportable segments | segment 4    
Percent of shares outstanding 12.50%    
Subsidiary - HG Global      
Basis of Presentation      
Purchase of surplus notes $ 503.0    
Subsidiary - HG Global | Maximum      
Basis of Presentation      
Percentage of par value of policy reinsured 15.00%    
Subsidiary - WTM Partners      
Basis of Presentation      
Expected capital contributions     $ 500.0
Subsidiary - Ark Insurance Holdings Limited      
Basis of Presentation      
Ownership percentage 72.00% 72.00%  
Ownership percentage, after equity incentives 61.90% 61.90%  
Subsidiary - WM Outrigger Re | Preferred Stock      
Basis of Presentation      
Ownership percentage 100.00% 100.00%  
Subsidiary - HG Global | Preferred Stock      
Basis of Presentation      
Ownership percentage 96.90% 96.90%  
Subsidiary - HG Global | Common Stock      
Basis of Presentation      
Ownership percentage   88.40%  
Subsidiary - Kudu Investment Management, LLC      
Basis of Presentation      
Ownership percentage   89.40%  
Ownership percentage of basic units outstanding   89.60%  
Ownership percentage, fully diluted 76.20%    
Ownership percentage, fully converted   76.30%  
Subsidiary - Bamboo Ide8 Insurance Services LLC      
Basis of Presentation      
Ownership percentage   72.80%  
Ownership percentage, fully diluted 63.70%