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HISTORICAL LOSS AND LAE DEVELOPMENT - Cumulative Paid Loss and Loss Adjustment Expenses, Net of Reinsurance (Details)
Dec. 31, 2016
Property segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 50.50%
Average annual percentage payout of incurred losses by age, Year 2 32.10%
Average annual percentage payout of incurred losses by age, Year 3 8.50%
Average annual percentage payout of incurred losses by age, Year 4 4.30%
Average annual percentage payout of incurred losses by age, Year 5 3.30%
Average annual percentage payout of incurred losses by age, Year 6 1.20%
Average annual percentage payout of incurred losses by age, Year 7 0.60%
Average annual percentage payout of incurred losses by age, Year 8 0.50%
Average annual percentage payout of incurred losses by age, Year 9 0.00%
Average annual percentage payout of incurred losses by age, Year 10 (0.10%)
Surety segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 22.80%
Average annual percentage payout of incurred losses by age, Year 2 38.20%
Average annual percentage payout of incurred losses by age, Year 3 13.80%
Average annual percentage payout of incurred losses by age, Year 4 7.50%
Average annual percentage payout of incurred losses by age, Year 5 4.40%
Average annual percentage payout of incurred losses by age, Year 6 4.50%
Average annual percentage payout of incurred losses by age, Year 7 1.30%
Average annual percentage payout of incurred losses by age, Year 8 0.00%
Average annual percentage payout of incurred losses by age, Year 9 12.60%
Average annual percentage payout of incurred losses by age, Year 10 3.40%
Primary Occurrence | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 7.80%
Average annual percentage payout of incurred losses by age, Year 2 11.60%
Average annual percentage payout of incurred losses by age, Year 3 16.70%
Average annual percentage payout of incurred losses by age, Year 4 19.40%
Average annual percentage payout of incurred losses by age, Year 5 16.00%
Average annual percentage payout of incurred losses by age, Year 6 9.30%
Average annual percentage payout of incurred losses by age, Year 7 7.20%
Average annual percentage payout of incurred losses by age, Year 8 5.40%
Average annual percentage payout of incurred losses by age, Year 9 4.10%
Average annual percentage payout of incurred losses by age, Year 10 (0.10%)
Excess Occurrence | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 5.40%
Average annual percentage payout of incurred losses by age, Year 2 19.70%
Average annual percentage payout of incurred losses by age, Year 3 20.00%
Average annual percentage payout of incurred losses by age, Year 4 17.80%
Average annual percentage payout of incurred losses by age, Year 5 11.10%
Average annual percentage payout of incurred losses by age, Year 6 7.50%
Average annual percentage payout of incurred losses by age, Year 7 6.10%
Average annual percentage payout of incurred losses by age, Year 8 2.60%
Average annual percentage payout of incurred losses by age, Year 9 0.90%
Average annual percentage payout of incurred losses by age, Year 10 0.00%
Claims Made | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 2.50%
Average annual percentage payout of incurred losses by age, Year 2 12.70%
Average annual percentage payout of incurred losses by age, Year 3 17.90%
Average annual percentage payout of incurred losses by age, Year 4 15.10%
Average annual percentage payout of incurred losses by age, Year 5 12.70%
Average annual percentage payout of incurred losses by age, Year 6 11.00%
Average annual percentage payout of incurred losses by age, Year 7 30.50%
Average annual percentage payout of incurred losses by age, Year 8 0.90%
Average annual percentage payout of incurred losses by age, Year 9 0.40%
Average annual percentage payout of incurred losses by age, Year 10 0.00%
Transportation | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 20.60%
Average annual percentage payout of incurred losses by age, Year 2 18.80%
Average annual percentage payout of incurred losses by age, Year 3 20.30%
Average annual percentage payout of incurred losses by age, Year 4 19.90%
Average annual percentage payout of incurred losses by age, Year 5 10.30%
Average annual percentage payout of incurred losses by age, Year 6 5.10%
Average annual percentage payout of incurred losses by age, Year 7 1.10%
Average annual percentage payout of incurred losses by age, Year 8 0.50%
Average annual percentage payout of incurred losses by age, Year 9 0.00%
Average annual percentage payout of incurred losses by age, Year 10 0.00%