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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, 2019
Workers’ compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 15.60%
2nd Year 19.30%
3rd Year 12.70%
4th Year 8.70%
5th Year 5.90%
6th Year 4.30%
7th Year 2.90%
8th Year 2.60%
9th Year 1.80%
10th Year 1.60%
General liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 2.90%
2nd Year 8.40%
3rd Year 15.00%
4th Year 18.50%
5th Year 15.80%
6th Year 10.50%
7th Year 7.50%
8th Year 4.40%
9th Year 2.50%
10th Year 1.90%
Marine [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 26.70%
2nd Year 32.30%
3rd Year 17.90%
4th Year 8.80%
5th Year 7.10%
6th Year 2.30%
7th Year 2.60%
8th Year 2.50%
Package business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 37.40%
2nd Year 21.60%
3rd Year 10.40%
4th Year 8.70%
5th Year 5.80%
6th Year 3.30%
7th Year 2.20%
8th Year 1.00%
9th Year 0.60%
10th Year 0.30%
Commercial automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 89.10%
2nd Year 7.80%
3rd Year (0.40%)
Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 5.40%
2nd Year 18.80%
3rd Year 17.50%
4th Year 14.00%
5th Year 11.10%
6th Year 5.70%
7th Year 2.70%
8th Year 1.00%
9th Year
10th Year
Bond  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 13.80%
2nd Year 27.20%
3rd Year 12.60%
4th Year 4.80%
5th Year 1.90%
6th Year 2.20%
7th Year 5.70%
8th Year 0.50%
9th Year 1.80%
10th Year (6.20%)
Assumed Reinsurance [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 37.70%
2nd Year 39.00%
3rd Year 7.40%
4th Year 4.70%
5th Year 8.80%
6th Year 2.30%
7th Year 0.90%
8th Year 0.70%
Personal automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 96.30%
2nd Year 3.00%
3rd Year (0.30%)
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 69.60%
2nd Year 21.50%
3rd Year 3.30%
4th Year 1.20%
5th Year 0.60%
6th Year 0.30%
7th Year 0.10%
8th Year 0.10%
9th Year 0.00%
10th Year 0.10%
Property and Casualty, Commercial Insurance [Member] | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 53.80%
2nd Year 30.50%
3rd Year 7.40%
4th Year 3.10%
5th Year 0.80%
6th Year 0.30%
7th Year 0.10%
8th Year (0.20%)
9th Year
10th Year
Property and Casualty, Commercial Insurance [Member] | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 16.90%
2nd Year 21.00%
3rd Year 20.80%
4th Year 17.80%
5th Year 11.80%
6th Year 4.30%
7th Year 2.70%
8th Year 1.40%
9th Year 0.70%
10th Year 0.30%
Property and Casualty, Personal Insurance [Member] | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 36.30%
2nd Year 33.10%
3rd Year 15.60%
4th Year 7.60%
5th Year 3.20%
6th Year 1.10%
7th Year 0.50%
8th Year 0.20%
9th Year 0.10%
10th Year 0.00%
Group Benefits | Group long-term disability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 7.40%
2nd Year 24.80%
3rd Year 15.50%
4th Year 8.60%
5th Year 6.30%
6th Year 5.40%
7th Year 4.60%
8th Year 3.90%
9th Year 3.40%