XML 106 R103.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Supplementary Information of Average Historical Claims (Detail)
Dec. 31, 2019
Commercial Specialty | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 61.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 24.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 10.90%
Commercial Specialty | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 7.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 18.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 19.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 18.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 11.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 7.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 2.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 2.60%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 2.10%
Specialty Property | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 86.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 6.20%
Specialty Property | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 11.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 24.60%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 19.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 17.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 8.10%
Farm, Ranch & Stable | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 84.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 9.40%
Farm, Ranch & Stable | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 16.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 15.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 19.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 9.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 14.40%
Reinsurance Operations | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 8.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 41.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 16.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 4.60%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 4.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven (2.30%)
Reinsurance Operations | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 19.80% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year two 0.20% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year three 6.80% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year four 6.30% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year five 2.20% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year six 6.00% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 1.60% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.90% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.30% [1]
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 1.80% [1]
[1] May not be indicative of future average annual percentage payout of incurred claims due to a change in mix of business