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Reserve for Unpaid Losses and Loss Adjustment Expenses - Average Annual Payout of Incurred Claims by Age, P&C (Details) | Dec. 31, 2018
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Workers’ compensation |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 15.80%
2nd Year | 19.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 12.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 9.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 6.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 4.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 3.20%
8th Year | 2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 2.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 1.40%
General liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 3.30%
2nd Year | 8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 14.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 16.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 13.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 9.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 7.80%
8th Year | 3.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 2.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 2.10%
Package business |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 38.10%
2nd Year | 21.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 10.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 5.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 3.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 1.90%
8th Year | 1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 0.30%
Commercial automobile physical damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 90.00%
2nd Year | 7.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | (0.50%)
Professional liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 5.70%
2nd Year | 18.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 18.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 16.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 9.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 7.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 1.30%
8th Year | 1.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 1.10%
Bond |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 15.40%
2nd Year | 30.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 13.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 3.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 1.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 6.10%
8th Year | (0.10%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 1.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | (1.90%)
Personal automobile physical damage |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 95.90%
2nd Year | 2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | (0.30%)
Homeowners |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 70.40%
2nd Year | 21.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 3.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 0.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 0.10%
8th Year | 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 0.00%
Group Insurance Policies | Group long-term disability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 7.30%
2nd Year | 24.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 15.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 6.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 5.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 4.60%
8th Year | 3.90%
Property and Casualty, Commercial Insurance Product Line [Member] | Property |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 60.80%
2nd Year | 27.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 4.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 1.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 0.10%
8th Year | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 0.00%
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 17.20%
2nd Year | 20.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 20.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 18.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 11.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 4.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 2.70%
8th Year | 1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 0.10%
Property and Casualty, Personal Insurance Product Line [Member] | Automobile liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
1st Year | 36.90%
2nd Year | 33.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year | 15.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year | 7.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year | 3.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year | 1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year | 0.50%
8th Year | 0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year | 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year | 0.00%

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- Definition Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671329-158438 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=99384497&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671329-158438 + Details
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