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Loss and Loss Adjustment Expense Reserves - Supplementary information about average historical claims (Details)
12 Months Ended
Dec. 31, 2025
Private Passenger Automobile Liability  
Loss and Loss Adjustment Expense Reserves  
Year 1 40.70%
Year 2 34.70%
Year 3 11.70%
Year 4 6.80%
Year 5 3.10%
Year 6 2.00%
Year 7 1.00%
Year 8 0.40%
Year 9 0.10%
Year 10 0.10%
Private Passenger Automobile Physical Damage  
Loss and Loss Adjustment Expense Reserves  
Year 1 101.80%
Year 2 (1.7)
Year 3 (1.7)
Year 4 (0.3)
Year 5 (0.1)
Year 6 0
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Commercial Automobile Liability  
Loss and Loss Adjustment Expense Reserves  
Year 1 23.30%
Year 2 25.70%
Year 3 14.50%
Year 4 13.80%
Year 5 8.40%
Year 6 7.00%
Year 7 3.40%
Year 8 3.40%
Year 9 1.00%
Year 10 0.00%
Commercial Automobile Physical Damage  
Loss and Loss Adjustment Expense Reserves  
Year 1 92.30%
Year 2 8.20%
Year 3 (1.6)
Year 4 (0.3)
Year 5 (0.1)
Year 6 (0.1)
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Homeowners Liability  
Loss and Loss Adjustment Expense Reserves  
Year 1 6.50%
Year 2 22.80%
Year 3 20.00%
Year 4 16.40%
Year 5 10.00%
Year 6 9.50%
Year 7 3.10%
Year 8 3.60%
Year 9 5.20%
Year 10 0.00%
Homeowners Property Damage  
Loss and Loss Adjustment Expense Reserves  
Year 1 67.20%
Year 2 23.30%
Year 3 2.90%
Year 4 0.60%
Year 5 0.00%
Year 6 0.10%
Year 7 (0.10%)
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%