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Reserves for Losses and Loss Settlement Expenses - Historical Claims Duration (Details)
Dec. 31, 2021
Commercial other liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.40%
Year 2 16.20%
Year 3 17.20%
Year 4 15.80%
Year 5 11.90%
Year 6 7.20%
Year 7 3.30%
Year 8 3.30%
Year 9 3.10%
Year 10 0.60%
Commercial fire and allied  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 63.70%
Year 2 22.00%
Year 3 4.80%
Year 4 3.80%
Year 5 2.20%
Year 6 1.30%
Year 7 0.30%
Year 8 1.00%
Year 9 0.40%
Year 10 0.70%
Commercial automobile  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 36.10%
Year 2 20.40%
Year 3 15.80%
Year 4 11.60%
Year 5 7.50%
Year 6 3.20%
Year 7 1.70%
Year 8 0.80%
Year 9 0.80%
Year 10 0.00%
Commercial workers' compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 30.50%
Year 2 31.80%
Year 3 15.50%
Year 4 8.00%
Year 5 3.80%
Year 6 2.50%
Year 7 1.70%
Year 8 1.20%
Year 9 0.80%
Year 10 0.60%
Personal  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 71.20%
Year 2 20.10%
Year 3 4.00%
Year 4 2.40%
Year 5 0.70%
Year 6 0.70%
Year 7 0.10%
Year 8 0.10%
Year 9 0.00%
Year 10 0.00%