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Short-Duration Insurance Contracts - Average Annual Percentage Payout Of Incurred Claims by Age (Details)
Dec. 31, 2023
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 78.80%
Year Two 18.10%
Year Three 2.20%
Year Four 0.50%
Year Five 0.30%
Year Six 0.00%
Year Seven 0.00%
Year Eight 0.00%
Year Nine 0.10%
Year Ten 0.00%
Auto liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 37.10%
Year Two 35.10%
Year Three 14.70%
Year Four 6.90%
Year Five 3.40%
Year Six 1.60%
Year Seven 0.60%
Year Eight 0.20%
Year Nine 0.40%
Year Ten 0.00%
Auto physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 94.70%
Year Two 5.30%
Year Three 0.00%
Year Four 0.00%
Year Five 0.00%
Year Six 0.00%
Year Seven 0.00%
Year Eight 0.00%
Year Nine 0.00%
Year Ten 0.00%
Specialty health  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 74.10%
Year Two 24.50%
Year Three 0.90%
Year Four 0.20%
Year Five 0.20%
Year Six 0.10%
Year Seven 0.00%
Year Eight 0.00%
Year Nine 0.00%
Year Ten 0.00%
Group disability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 29.30%
Year Two 32.40%
Year Three 9.70%
Year Four 4.00%
Year Five 3.40%
Year Six 3.10%
Year Seven 3.00%
Year Eight 2.50%
Year Nine 2.10%
Year Ten 1.80%