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Reserve for Loss and Loss Expense - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]      
Increase of net loss and loss expense reserves $ 849,200 $ 331,000 $ 385,000
Salvage and subrogation recoveries, value 133,700 116,000 91,300
Incurred loss and loss expense for claims occurring in the prior year 285,271 9,954 (78,890)
Favorable or Unfavorable Loss Development      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 285,300 10,000 (78,900)
Favorable or Unfavorable Loss Development | Casualty lines      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 311,000 (6,500) (86,000)
Favorable or Unfavorable Loss Development | Property lines      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year $ (25,700) $ 16,500 $ 7,100