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Claim and Claim Adjustment Expense Reserves (Historical Claims Duration) (Details)
Dec. 31, 2023
Medical Professional Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.70%
Year 2 16.40%
Year 3 22.10%
Year 4 17.20%
Year 5 12.40%
Year 6 9.10%
Year 7 4.80%
Year 8 2.90%
Year 9 1.20%
Year 10 1.10%
Other Professional Liability and Management Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 6.50%
Year 2 19.80%
Year 3 19.30%
Year 4 14.90%
Year 5 10.90%
Year 6 6.30%
Year 7 4.90%
Year 8 6.00%
Year 9 1.70%
Year 10 0.50%
Surety | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 17.70%
Year 2 46.60%
Year 3 17.70%
Year 4 3.40%
Year 5 2.20%
Year 6 5.20%
Year 7 (1.70%)
Year 8 (0.80%)
Year 9 (0.10%)
Year 10 0.00%
Commercial Auto | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 25.20%
Year 2 22.20%
Year 3 18.20%
Year 4 14.30%
Year 5 10.60%
Year 6 4.90%
Year 7 2.00%
Year 8 0.70%
Year 9 0.30%
Year 10 0.50%
General Liability | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.60%
Year 2 12.80%
Year 3 16.30%
Year 4 17.40%
Year 5 14.40%
Year 6 9.10%
Year 7 5.90%
Year 8 5.30%
Year 9 2.20%
Year 10 2.70%
Workers' Compensation | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 16.00%
Year 2 22.90%
Year 3 13.80%
Year 4 8.80%
Year 5 6.00%
Year 6 3.20%
Year 7 2.10%
Year 8 1.30%
Year 9 1.20%
Year 10 1.70%
Excluding Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 16.90%
Year 2 21.80%
Year 3 9.80%
Year 4 6.50%
Year 5 5.90%
Year 6 7.40%
Year 7 8.40%
Year 8 2.60%
Year 9 2.80%
Year 10 1.70%
Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.00%
Year 2 31.30%
Year 3 13.70%
Year 4 7.50%
Year 5 4.70%
Year 6 4.90%
Year 7 0.50%
Year 8 2.30%
Year 9 (1.40%)
Year 10 0.00%