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Property Casualty Loss and Loss Expense - Average Annual Payout (Details)
Dec. 31, 2023
Commercial Insurance | Commercial Casualty Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 6.40%
2 13.70%
3 18.90%
4 18.40%
5 13.80%
6 9.10%
7 5.70%
8 4.00%
9 3.50%
10 2.10%
Commercial Insurance | Workers' Compensation Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 24.30%
2 25.20%
3 11.30%
4 6.60%
5 3.90%
6 2.10%
7 1.60%
8 0.80%
9 0.80%
10 0.90%
Commercial Insurance | Commercial Auto Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 39.10%
2 18.90%
3 15.30%
4 12.80%
5 8.60%
Commercial Insurance | Commercial Property Line  
Short-duration Insurance Contracts, Historical Claims Duration  
1 61.10%
2 29.70%
3 4.50%
4 2.00%
5 0.00%
Personal Insurance | Personal Auto  
Short-duration Insurance Contracts, Historical Claims Duration  
1 65.60%
2 16.40%
3 8.20%
4 5.00%
5 2.40%
Personal Insurance | Homeowner  
Short-duration Insurance Contracts, Historical Claims Duration  
1 65.80%
2 25.80%
3 4.10%
4 1.60%
5 0.60%
Excess and Surplus Lines Insurance  
Short-duration Insurance Contracts, Historical Claims Duration  
1 10.10%
2 13.20%
3 17.40%
4 16.20%
5 13.10%
6 10.40%
7 6.30%
8 2.70%
9 4.30%
10 1.10%