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Insurance Claim Reserves (Details) - Historical Claim Duration
Dec. 31, 2021
Business Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 12.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 18.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 13.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 10.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.60%
Business Insurance [Member] | Commercial property [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 55.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 32.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 5.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.80%
Business Insurance [Member] | Commercial multi-peril [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 37.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 9.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.40%
Business Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 27.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 18.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 13.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 8.80%
Business Insurance [Member] | Workers' compensation [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 18.20%
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 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 4.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.30%
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 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 19.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 9.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 7.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 4.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 5.60%
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 23.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 35.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 3.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.10%
Personal Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 57.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.40%
Personal Insurance [Member] | Homeowners (excluding Other) [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 68.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 2.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four (2.80%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.70%
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 17.50%
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 7.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.70%