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Basis of Presentation and Significant Accounting Policies (Details)
$ in Millions
9 Months Ended
Jul. 18, 2025
USD ($)
Sep. 30, 2025
USD ($)
segment
business
Sep. 02, 2025
Dec. 31, 2024
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Number of reportable segments | segment   5    
Percent of shares outstanding   12.30%    
Number of integrated businesses | business   2    
BroadStreet        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Payments to acquire limited partnership interests $ 150.0      
Subsidiary - HG Global        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Purchase of surplus notes   $ 503.0    
Subsidiary - HG Global | Maximum        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Percentage of par value of policy reinsured   15.00%    
Subsidiary - Ark Insurance Holdings Limited        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   72.10%   72.10%
Ownership percentage, after equity incentives   61.90%   61.90%
Subsidiary - WM Outrigger Re | Preferred Stock        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   100.00%   100.00%
Subsidiary - HG Global | Preferred Stock        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   96.90%   96.90%
Subsidiary - HG Global | Common equity securities        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   88.40%   88.40%
Kudu        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   91.20%    
Ownership percentage of basic units outstanding       90.40%
Ownership percentage, fully diluted   77.90%   77.00%
Subsidiary - Bamboo Ide8 Insurance Services LLC        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   72.80%   72.80%
Ownership percentage, fully diluted   63.70%   63.70%
Subsidiary - Distinguished Managing General Agent        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Basic ownership   55.50% 55.50%  
Ownership percentage, fully diluted   43.60% 43.60%