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Policy and Claim Reserves (Average Annual Percentage Payout of Incurred Claims by Age) (Details)
Dec. 31, 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 1 72.50%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 2 22.10%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 3 5.40%
Homeowners, Dwelling Fire and Other Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 1 87.70%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 2 9.50%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 3 1.00%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 4 0.50%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 5 0.50%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 6 0.50%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 7 0.10%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 8 0.04%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 9 0.00%
Average Annual Percentage Payout of Incurred Claims by Age (in Years), Net of Reinsurance, year 10 0.00%