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Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves (Historical Claims Duration) (Details)
Dec. 31, 2022
Medical Professional Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.60%
Year 2 17.00%
Year 3 23.00%
Year 4 18.00%
Year 5 11.90%
Year 6 8.20%
Year 7 4.70%
Year 8 2.30%
Year 9 1.00%
Year 10 0.90%
Other Professional Liability and Management Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 6.60%
Year 2 21.00%
Year 3 20.70%
Year 4 16.20%
Year 5 10.30%
Year 6 6.00%
Year 7 4.30%
Year 8 4.80%
Year 9 1.40%
Year 10 0.50%
Surety | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.00%
Year 2 40.50%
Year 3 20.20%
Year 4 3.60%
Year 5 2.10%
Year 6 4.80%
Year 7 (1.70%)
Year 8 0.40%
Year 9 (0.60%)
Year 10 0.00%
Commercial Auto | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 26.10%
Year 2 22.00%
Year 3 17.60%
Year 4 13.90%
Year 5 10.40%
Year 6 4.80%
Year 7 1.70%
Year 8 0.50%
Year 9 0.00%
Year 10 0.00%
General Liability | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.90%
Year 2 13.70%
Year 3 17.10%
Year 4 18.80%
Year 5 14.30%
Year 6 9.40%
Year 7 5.70%
Year 8 4.60%
Year 9 2.10%
Year 10 0.60%
Workers' Compensation | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 15.30%
Year 2 22.30%
Year 3 13.70%
Year 4 9.40%
Year 5 6.10%
Year 6 2.30%
Year 7 1.10%
Year 8 1.40%
Year 9 1.00%
Year 10 1.10%
Excluding Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.30%
Year 2 22.50%
Year 3 10.40%
Year 4 7.10%
Year 5 6.00%
Year 6 6.20%
Year 7 6.70%
Year 8 2.90%
Year 9 2.50%
Year 10 1.30%
Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.70%
Year 2 34.00%
Year 3 13.40%
Year 4 7.00%
Year 5 4.40%
Year 6 3.90%
Year 7 0.60%
Year 8 2.10%
Year 9 1.00%
Year 10 0.70%