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Short-Duration Insurance Contracts - Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (Details)
Dec. 31, 2018
Short-tail | Personal Insurance Segments [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 64.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 4.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.50%
Short-tail | Commercial insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 8.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 4.60%
Short-tail | Specialty Insurance Segment [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 30.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 16.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 12.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 9.40%
Long-tail | Commercial insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 26.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 27.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 3.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.40%
Long-tail | Specialty Insurance Segment [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 17.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 22.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 11.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 6.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.10%