XML 76 R62.htm IDEA: XBRL DOCUMENT v3.10.0.1
HISTORICAL LOSS AND LAE DEVELOPMENT - Cumulative Paid Loss and Loss Adjustment Expenses, Net of Reinsurance (Details)
Dec. 31, 2018
Property segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 52.00%
Average annual percentage payout of incurred losses by age, Year 2 30.90%
Average annual percentage payout of incurred losses by age, Year 3 7.40%
Average annual percentage payout of incurred losses by age, Year 4 3.20%
Average annual percentage payout of incurred losses by age, Year 5 3.00%
Average annual percentage payout of incurred losses by age, Year 6 0.70%
Average annual percentage payout of incurred losses by age, Year 7 0.60%
Average annual percentage payout of incurred losses by age, Year 8 1.00%
Average annual percentage payout of incurred losses by age, Year 9 0.10%
Average annual percentage payout of incurred losses by age, Year 10 (0.60%)
Surety segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 24.00%
Average annual percentage payout of incurred losses by age, Year 2 40.00%
Average annual percentage payout of incurred losses by age, Year 3 12.00%
Average annual percentage payout of incurred losses by age, Year 4 7.50%
Average annual percentage payout of incurred losses by age, Year 5 4.50%
Average annual percentage payout of incurred losses by age, Year 6 3.50%
Average annual percentage payout of incurred losses by age, Year 7 (1.30%)
Average annual percentage payout of incurred losses by age, Year 8 (6.10%)
Average annual percentage payout of incurred losses by age, Year 9 9.30%
Average annual percentage payout of incurred losses by age, Year 10 1.70%
Primary Occurrence | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 9.70%
Average annual percentage payout of incurred losses by age, Year 2 12.40%
Average annual percentage payout of incurred losses by age, Year 3 16.80%
Average annual percentage payout of incurred losses by age, Year 4 18.60%
Average annual percentage payout of incurred losses by age, Year 5 13.90%
Average annual percentage payout of incurred losses by age, Year 6 8.20%
Average annual percentage payout of incurred losses by age, Year 7 5.50%
Average annual percentage payout of incurred losses by age, Year 8 4.60%
Average annual percentage payout of incurred losses by age, Year 9 3.00%
Average annual percentage payout of incurred losses by age, Year 10 1.50%
Excess Occurrence | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 4.50%
Average annual percentage payout of incurred losses by age, Year 2 15.30%
Average annual percentage payout of incurred losses by age, Year 3 18.90%
Average annual percentage payout of incurred losses by age, Year 4 17.00%
Average annual percentage payout of incurred losses by age, Year 5 10.00%
Average annual percentage payout of incurred losses by age, Year 6 8.20%
Average annual percentage payout of incurred losses by age, Year 7 7.40%
Average annual percentage payout of incurred losses by age, Year 8 3.80%
Average annual percentage payout of incurred losses by age, Year 9 0.20%
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 3.00%
Average annual percentage payout of incurred losses by age, Year 2 15.30%
Average annual percentage payout of incurred losses by age, Year 3 18.50%
Average annual percentage payout of incurred losses by age, Year 4 14.70%
Average annual percentage payout of incurred losses by age, Year 5 10.00%
Average annual percentage payout of incurred losses by age, Year 6 13.40%
Average annual percentage payout of incurred losses by age, Year 7 7.40%
Average annual percentage payout of incurred losses by age, Year 8 7.10%
Average annual percentage payout of incurred losses by age, Year 9 0.40%
Average annual percentage payout of incurred losses by age, Year 10 3.00%
Transportation | Casualty segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 17.90%
Average annual percentage payout of incurred losses by age, Year 2 18.20%
Average annual percentage payout of incurred losses by age, Year 3 20.10%
Average annual percentage payout of incurred losses by age, Year 4 20.20%
Average annual percentage payout of incurred losses by age, Year 5 11.20%
Average annual percentage payout of incurred losses by age, Year 6 4.80%
Average annual percentage payout of incurred losses by age, Year 7 1.40%
Average annual percentage payout of incurred losses by age, Year 8 0.60%
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%