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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 43.40%
Year 2 32.10%
Year 3 10.40%
Year 4 6.20%
Year 5 2.90%
Year 6 1.70%
Year 7 0.60%
Year 8 0.30%
Year 9 0.10%
Year 10 0.00%
Private Passenger Automobile Physical Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 107.00%
Year 2 (4.8)
Year 3 (2.5)
Year 4 (0.4)
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 25.90%
Year 2 24.80%
Year 3 12.40%
Year 4 10.60%
Year 5 6.80%
Year 6 6.10%
Year 7 3.00%
Year 8 1.80%
Year 9 0.20%
Year 10 0.10%
Commercial Automobile Physical Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 96.10%
Year 2 5.80%
Year 3 (2.3)
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 7.00%
Year 2 21.50%
Year 3 15.80%
Year 4 10.20%
Year 5 9.80%
Year 6 11.00%
Year 7 1.80%
Year 8 0.80%
Year 9 0.10%
Year 10 0.00%
Homeowners Property Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 71.30%
Year 2 20.90%
Year 3 4.50%
Year 4 0.60%
Year 5 0.00%
Year 6 0.00%
Year 7 (0.10%)
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%