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Loss and Loss Adjustment Expense Reserves - Supplementary information about average historical claims (Details)
12 Months Ended
Dec. 31, 2019
Private Passenger Automobile Liability  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 43.70%
Year 2 32.00%
Year 3 10.30%
Year 4 6.50%
Year 5 3.10%
Year 6 1.70%
Year 7 0.60%
Year 8 0.20%
Year 9 0.00%
Year 10 0.00%
Private Passenger Automobile Physical Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 107.40%
Year 2 (5.1)
Year 3 (2.3)
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 27.50%
Year 2 26.30%
Year 3 12.50%
Year 4 10.60%
Year 5 5.90%
Year 6 5.90%
Year 7 1.60%
Year 8 2.60%
Year 9 0.10%
Year 10 0.10%
Commercial Automobile Physical Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 95.40%
Year 2 5.50%
Year 3 (1.9)
Year 4 (0.3)
Year 5 (0.1)
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 9.10%
Year 2 22.30%
Year 3 16.90%
Year 4 11.50%
Year 5 8.90%
Year 6 10.40%
Year 7 2.60%
Year 8 0.30%
Year 9 0.00%
Year 10 0.00%
Homeowners Property Damage  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance  
Year 1 70.60%
Year 2 21.20%
Year 3 4.80%
Year 4 0.40%
Year 5 0.00%
Year 6 0.00%
Year 7 (0.20%)
Year 8 0.00%
Year 9 (0.20%)
Year 10 0.00%