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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Jul. 31, 2012
Ark      
Basis of Presentation      
Percent of shares outstanding 12.50%    
Asset Management (Kudu)      
Basis of Presentation      
Ownership interest (as a percent) 89.30% 99.30%  
Fully diluted ownership interest (as a percent) 76.10% 84.70%  
NSM Insurance Group      
Basis of Presentation      
Ownership interest (as a percent) 96.50% 96.50%  
Fully diluted ownership interest (as a percent) 87.30% 87.30%  
HG Global      
Basis of Presentation      
Percentage of par value of policy reinsured 15.00%    
Surplus notes $ 503.0   $ 503.0
HG Global | Preferred Stock      
Basis of Presentation      
Ownership interest (as a percent) 96.90% 96.90%  
HG Global | Common equity securities      
Basis of Presentation      
Ownership interest (as a percent) 88.40% 88.40%  
Ark | Ark      
Basis of Presentation      
Ownership interest (as a percent) 72.00% 72.00%  
Fully diluted ownership interest (as a percent) 63.00% 63.00%  
Ark | Ark      
Basis of Presentation      
Ownership interest (as a percent) 72.00%    
Fully diluted ownership interest (as a percent) 63.00%