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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, 2017
Workers’ compensation
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	16.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	19.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	13.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year	9.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year	6.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year	4.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	3.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	2.70%
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	1.70%
General liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	3.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	9.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	16.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year	17.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year	13.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year	9.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	7.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	3.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year	2.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year	1.60%
Package business
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	38.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	22.00%
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	8.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year	5.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year	3.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	1.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	1.20%
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	0.40%
Commercial property
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	61.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	27.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	4.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year	1.60%
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	0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 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%
Commercial automobile liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	17.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	20.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	20.30%
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	11.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year	5.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	2.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year	0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year	0.50%
Commercial automobile physical damage
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	90.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	8.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	(0.30%)
Professional liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	5.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	18.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	18.70%
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	10.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year	6.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	1.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	4.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 9th Year	2.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 10th Year	0.40%
Bond
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	14.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	26.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	13.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year	3.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year	0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 6th Year	2.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 7th Year	3.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	0.00%
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	0.60%
Personal automobile liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	37.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	33.10%
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	7.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year	3.20%
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	0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	0.30%
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%
Personal automobile physical damage
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	96.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	3.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	(0.20%)
Homeowners
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 1st Year	72.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 2nd Year	20.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 3rd Year	3.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 4th Year	1.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 5th Year	0.60%
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%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, 8th Year	0.10%
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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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

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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.

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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.

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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.

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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.

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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.

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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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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.

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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