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Loss and Loss Adjustment Expense Reserves - Supplementary information about average historical claims (Details)
12 Months Ended
Dec. 31, 2021
Private Passenger Automobile Liability  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 43.00%
Year 2 32.80%
Year 3 10.50%
Year 4 6.40%
Year 5 3.00%
Year 6 1.70%
Year 7 0.60%
Year 8 0.30%
Year 9 0.10%
Year 10 0.10%
Private Passenger Automobile Physical Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 106.20%
Year 2 (4.3)
Year 3 (2.4)
Year 4 (0.3)
Year 5 (0.1)
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Commercial Automobile Liability  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 26.20%
Year 2 25.20%
Year 3 12.20%
Year 4 11.80%
Year 5 7.10%
Year 6 5.80%
Year 7 3.00%
Year 8 0.70%
Year 9 1.20%
Year 10 0.00%
Commercial Automobile Physical Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 94.40%
Year 2 6.70%
Year 3 (2.1)
Year 4 (0.4)
Year 5 0.0
Year 6 0.0
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Homeowners Liability  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 5.80%
Year 2 24.00%
Year 3 15.50%
Year 4 10.20%
Year 5 11.00%
Year 6 10.40%
Year 7 3.20%
Year 8 0.90%
Year 9 0.10%
Year 10 0.30%
Homeowners Property Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 71.60%
Year 2 21.10%
Year 3 4.60%
Year 4 0.80%
Year 5 0.00%
Year 6 0.00%
Year 7 (0.10%)
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%