XML 102 R83.htm IDEA: XBRL DOCUMENT v3.10.0.1
Insurance Claim Reserves (Details) - Historical Claim Duration
Dec. 31, 2018
Business Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 3.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 13.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 19.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 19.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 13.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 9.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.50%
Business Insurance [Member] | Commercial property [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 52.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 31.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 2.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.70%
Business Insurance [Member] | Commercial multi-peril [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 39.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 23.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 9.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.60%
Business Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 31.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 13.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 9.30%
Business Insurance [Member] | Workers' compensation [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 17.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 5.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.70%
Bond & Specialty Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 19.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 15.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 11.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 7.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.20%
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 29.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 31.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 6.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five (2.70%)
Personal Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 58.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.90%
Personal Insurance [Member] | Homeowners (excluding Other) [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 67.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 4.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.50%
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 18.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 7.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 5.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.20%