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Loss And Loss Adjustment Expense Reserves Historical Claims Duration (Details) | Dec. 31, 2017
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Personal Lines Segment | Agency Channel | Personal Lines - Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 47.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 30.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 11.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 5.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 2.10%
Personal Lines Segment | Agency Channel | Personal Lines - Physical Damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 98.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | (0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 0.00%
Personal Lines Segment | Direct Channel | Personal Lines - Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 46.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 31.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 11.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 5.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 2.20%
Personal Lines Segment | Direct Channel | Personal Lines - Physical Damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 100.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | (0.20%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | (0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 0.00%
Commercial Lines Segment | Commercial Lines - Liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 25.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 28.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 19.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 11.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 6.00%
Commercial Lines Segment | Commercial Lines - Physical Damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 90.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 7.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 0.00%
Property Segment | Property |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Short-duration Insurance Contracts, Historical Claims Duration, Year One | 73.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two | 19.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three | 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four | 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five | 0.40%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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