v3.26.1
General - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Summary Of Significant Accounting Policies [Line Items]          
Potentially dilutive securities (in shares) 0 0 0 0  
Dividends declared and paid (in dollars per share) $ 0.3175 $ 0.3175 $ 0.6350 $ 0.6350  
Policy acquisition costs $ 250,328,000 $ 227,880,000 $ 490,830,000 $ 456,601,000  
Advertising expenses 10,400,000 7,400,000 26,400,000 12,900,000  
Ceded premiums earned 62,600,000 54,400,000 125,200,000 161,100,000  
Losses and loss adjustment expenses, ceded 700,000 400,000 400,000 1,292,900,000  
Revenue from contract with customer 7,500,000 6,800,000 15,900,000 13,900,000  
Cost of goods and services sold 4,200,000 $ 3,600,000 8,600,000 7,200,000  
Contract with customer, liability 0   0   $ 0
Contract with customer, asset 0   0   0
Revenue, remaining performance obligation 0   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   $ 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   $ 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     2,790,000,000    
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   $ 60,000,000