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Reserve for Loss and Loss Expense - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year $ 34,648 $ 187,121
Casualty reserve    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year 50,000 211,000
Casualty reserve | Standard Commercial Lines | Commercial automobile    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year 25,000 10,000
Casualty reserve | Standard Commercial Lines | General liability    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year 20,000 216,000
Casualty reserve | Standard Commercial Lines | Workers' compensation    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year   15,000
Casualty reserve | Standard Personal Lines | Personal automobile    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year 5,000 5,000
Casualty reserve | Standard Personal Lines | Homeowners    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year   (5,000)
Property lines    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Incurred loss and loss expense for claims occurring in the prior year $ (15,400) $ (23,900)