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Reserve for Loss and Loss Expense - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
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 $ 182,748 $ (5,782)
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 211,000 (16,500)
Casualty reserve | 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   4,000
Casualty reserve | 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   (24,500)
Casualty reserve | E&S    
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)
Casualty reserve | 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   9,000
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 216,000  
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 20,000  
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 (20,000)  
Casualty reserve | Standard Commercial Lines | Surety 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 (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)  
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  
Property 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 $ (28,300) $ 10,700