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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
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%