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Reserves for unpaid losses and loss adjustment expenses - Average Annual Percentage Payout of Incurred Losses and Allocated LAE by Age, Net of Reinsurance (Details)
Dec. 31, 2019
Other property  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 17.80%
Year 2 42.50%
Year 3 20.10%
Year 4 7.20%
Year 5 3.10%
Year 6 1.80%
Year 7 0.90%
Year 8 0.30%
Year 9 0.10%
Year 10 0.70%
Property Catastrophe Excess  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 12.70%
Year 2 45.70%
Year 3 19.00%
Year 4 9.80%
Year 5 2.30%
Year 6 2.00%
Year 7 1.90%
Year 8 0.70%
Year 9 0.50%
Year 10 0.80%
Agriculture  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 22.30%
Year 2 67.50%
Year 3 4.80%
Year 4 0.40%
Year 5 1.10%
Year 6 0.10%
Year 7 0.10%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Global Accident & Health  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 46.10%
Year 2 42.60%
Year 3 9.60%
Year 4 1.40%
Year 5 0.30%
Year 6 0.10%
Year 7 0.00%
Year 8 0.00%
Year 9 0.10%
Year 10 0.00%
Aviation & Space  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 25.30%
Year 2 29.40%
Year 3 17.80%
Year 4 9.60%
Year 5 5.20%
Year 6 2.70%
Year 7 2.50%
Year 8 (0.30%)
Year 9 2.60%
Year 10 0.40%
Trade credit  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 32.30%
Year 2 35.40%
Year 3 17.60%
Year 4 4.80%
Year 5 1.80%
Year 6 0.30%
Year 7 0.10%
Year 8 0.10%
Year 9 0.30%
Year 10 (0.20%)
Environmental  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 1.00%
Year 2 6.30%
Year 3 0.00%
Year 4 0.00%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Marine  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 18.10%
Year 2 30.50%
Year 3 22.20%
Year 4 9.70%
Year 5 5.40%
Year 6 6.40%
Year 7 2.60%
Year 8 2.70%
Year 9 1.40%
Year 10 0.70%
Surety  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 7.30%
Year 2 9.00%
Year 3 19.00%
Year 4 14.70%
Year 5 12.40%
Year 6 17.80%
Year 7 1.70%
Year 8 2.00%
Year 9 0.90%
Year 10 0.30%
Contingency  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 42.20%
Year 2 36.20%
Year 3 10.80%
Year 4 1.70%
Year 5 3.20%
Year 6 0.00%
Year 7 0.20%
Year 8 0.40%
Year 9 0.40%
Year 10 0.00%
Casualty  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 5.90%
Year 2 9.40%
Year 3 9.50%
Year 4 11.10%
Year 5 7.30%
Year 6 10.00%
Year 7 0.60%
Year 8 13.40%
Year 9 1.00%
Year 10 0.70%
Runoff & Other  
Average annual percentage payout of incurred losses and allocated LAE by age, net of reinsurance  
Year 1 66.90%
Year 2 20.60%
Year 3 2.00%
Year 4 1.50%
Year 5 1.10%
Year 6 1.10%
Year 7 0.70%
Year 8 0.50%
Year 9 0.20%
Year 10 0.10%