v3.26.1
General - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Summary Of Significant Accounting Policies [Line Items]      
Potentially dilutive securities (in shares) 0 0  
Dividends declared and paid (in dollars per share) $ 0.3175 $ 0.3175  
Policy acquisition costs $ 240,502,000 $ 228,720,000  
Advertising expenses 16,000,000.0 5,500,000  
Ceded premiums earned 62,700,000 106,700,000  
Losses and loss adjustment expenses, ceded (300,000) 1,292,500,000  
Revenue from contract with customer 8,400,000 7,000,000.0  
Cost of goods and services sold 4,400,000 3,600,000  
Contract with customer, liability 0   $ 0
Contract with customer, asset 0   0
Revenue, remaining performance obligation 0   $ 0
Accrued interest receivable considered uncollectible or written off 0 $ 0  
Reinsurance Contract [Axis]: Catastrophe Participation Reinsurance Contract (the "Contract")      
Summary Of Significant Accounting Policies [Line Items]      
Reinsurance reimbursable amount $ 30,000,000    
Reinsurance retention policy, threshold loss ratio 73.50%    
Reinsurance Contract [Axis]: Catastrophe Quota Share Reinsurance Agreement ("Quota Share Agreement")      
Summary Of Significant Accounting Policies [Line Items]      
Reinsurance reimbursable amount $ 12,000,000    
Reinsurance Contract [Axis]: Catastrophe Reinsurance Treaty (the "Treaty")      
Summary Of Significant Accounting Policies [Line Items]      
Reinsurance retention policy, excess retention, amount reinsured 2,140,000,000    
Reinsurance policy, amount retained 200,000,000    
Reinsurance Contract [Axis]: Property Quota Share Reinsurance Contract ("Quota Share Contract")      
Summary Of Significant Accounting Policies [Line Items]      
Reinsurance reimbursable amount $ 60,000,000