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Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves - Supplementary Information about Average Historical Claims Duration (Details)
Dec. 31, 2022
Medical Professional Liability  
Average Annual percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses [Abstract]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 17.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 23.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 18.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 11.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 8.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 4.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.90%
Other Professional Liability and Management Liability  
Average Annual percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses [Abstract]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 20.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 10.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 4.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.50%
Surety  
Average Annual percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses [Abstract]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 19.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 40.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 20.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven (1.70%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine (0.60%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Commercial Auto  
Average Annual percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses [Abstract]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 26.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 13.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 10.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
General Liability  
Average Annual percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses [Abstract]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 3.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 13.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 18.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 14.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 9.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.60%
Workers' Compensation  
Average Annual percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses [Abstract]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 15.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 9.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 2.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.10%