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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Historical Claims Duration) (Details)
Dec. 31, 2020
Commercial other liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.60%
Year 2 16.00%
Year 3 18.00%
Year 4 16.80%
Year 5 12.30%
Year 6 7.20%
Year 7 4.30%
Year 8 2.70%
Year 9 1.70%
Year 10 1.90%
Commercial fire and allied  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 64.60%
Year 2 21.40%
Year 3 4.80%
Year 4 3.80%
Year 5 2.20%
Year 6 1.30%
Year 7 0.70%
Year 8 0.70%
Year 9 0.20%
Year 10 0.10%
Commercial automobile  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 35.90%
Year 2 20.30%
Year 3 15.50%
Year 4 12.50%
Year 5 7.50%
Year 6 3.10%
Year 7 1.70%
Year 8 0.90%
Year 9 1.20%
Year 10 0.20%
Commercial workers' compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 29.50%
Year 2 32.40%
Year 3 14.80%
Year 4 7.60%
Year 5 3.50%
Year 6 2.50%
Year 7 1.50%
Year 8 1.20%
Year 9 0.90%
Year 10 2.20%
Personal  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 71.30%
Year 2 19.70%
Year 3 3.80%
Year 4 2.40%
Year 5 0.70%
Year 6 0.70%
Year 7 0.10%
Year 8 0.10%
Year 9 0.10%
Year 10 0.00%