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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Historical Claims Duration) (Details)
Dec. 31, 2017
Commercial other liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 10.10%
Year 2 15.90%
Year 3 16.40%
Year 4 15.30%
Year 5 11.90%
Year 6 6.40%
Year 7 5.60%
Year 8 4.00%
Year 9 3.90%
Year 10 2.20%
Commercial fire and allied  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 64.40%
Year 2 20.90%
Year 3 4.80%
Year 4 3.70%
Year 5 3.00%
Year 6 0.90%
Year 7 0.90%
Year 8 0.40%
Year 9 0.20%
Year 10 0.00%
Commercial automobile  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 39.90%
Year 2 20.90%
Year 3 15.10%
Year 4 10.90%
Year 5 5.60%
Year 6 2.80%
Year 7 1.80%
Year 8 0.10%
Year 9 0.00%
Year 10 0.50%
Commercial workers' compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 26.10%
Year 2 29.00%
Year 3 13.60%
Year 4 8.10%
Year 5 4.30%
Year 6 3.20%
Year 7 1.80%
Year 8 4.50%
Year 9 0.80%
Year 10 1.90%
Personal  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 71.90%
Year 2 19.10%
Year 3 4.00%
Year 4 2.50%
Year 5 1.10%
Year 6 0.50%
Year 7 0.30%
Year 8 0.10%
Year 9 0.10%
Year 10 0.20%