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Insurance Claim Reserves (Details) - Historical Claim Duration
Dec. 31, 2020
Business Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 12.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 18.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 12.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 9.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.80%
Business Insurance [Member] | Commercial property [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 54.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 33.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 6.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.60%
Business Insurance [Member] | Commercial multi-peril [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 38.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 23.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 9.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.20%
Business Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 28.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 14.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.50%
Business Insurance [Member] | Workers' compensation [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 17.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 4.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.10%
Bond & Specialty Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 7.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 19.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 10.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.00%
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 25.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 39.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 3.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 11.60%
Personal Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 58.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.50%
Personal Insurance [Member] | Homeowners (excluding Other) [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 68.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 2.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four (1.70%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.60%
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 17.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.90%