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Reserves for Losses and Loss Settlement Expenses - Historical Claims Duration (Details)
Dec. 31, 2022
Commercial other liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.00%
Year 2 15.10%
Year 3 16.00%
Year 4 15.40%
Year 5 12.10%
Year 6 8.00%
Year 7 4.60%
Year 8 4.60%
Year 9 3.20%
Year 10 4.60%
Commercial fire and allied  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 62.60%
Year 2 22.40%
Year 3 5.30%
Year 4 4.10%
Year 5 2.30%
Year 6 1.20%
Year 7 0.50%
Year 8 0.60%
Year 9 0.40%
Year 10 (0.10%)
Commercial automobile  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 36.50%
Year 2 20.80%
Year 3 15.80%
Year 4 12.00%
Year 5 7.80%
Year 6 3.50%
Year 7 1.60%
Year 8 1.10%
Year 9 0.70%
Year 10 0.40%
Commercial workers' compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 31.50%
Year 2 32.10%
Year 3 15.70%
Year 4 8.60%
Year 5 3.40%
Year 6 2.50%
Year 7 1.90%
Year 8 0.70%
Year 9 0.70%
Year 10 0.20%
Personal  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 68.80%
Year 2 18.70%
Year 3 4.00%
Year 4 2.50%
Year 5 1.20%
Year 6 0.60%
Year 7 0.10%
Year 8 0.10%
Year 9 0.00%
Year 10 0.00%