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Average Annual Payout (Details)
Dec. 31, 2020
Commercial Insurance | Commercial Casualty Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 7.30%
2 14.90%
3 17.90%
4 18.80%
5 12.70%
6 9.10%
7 4.80%
8 3.50%
9 3.00%
10 1.70%
Commercial Insurance | Workers' Compensation Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 25.90%
2 26.30%
3 11.90%
4 6.70%
5 4.10%
6 2.00%
7 1.40%
8 1.20%
9 1.10%
10 0.50%
Commercial Insurance | Commercial Auto Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 39.90%
2 18.60%
3 15.80%
4 11.50%
5 7.00%
Commercial Insurance | Commercial Property Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 65.30%
2 25.80%
3 3.90%
4 2.10%
5 0.10%
Personal Insurance | Personal Auto  
Short-duration Insurance Contracts, Historical Claims Duration  
1 64.20%
2 17.30%
3 8.60%
4 4.60%
5 2.00%
Personal Insurance | Home Owner Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 69.30%
2 23.00%
3 4.10%
4 1.40%
5 0.80%
Excess and Surplus Lines Insurance  
Short-duration Insurance Contracts, Historical Claims Duration  
1 14.60%
2 14.40%
3 19.20%
4 15.40%
5 11.70%
6 6.90%
7 3.90%
8 2.20%
9 1.00%
10 0.20%