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Claim, Claim Adjustment Expense and Future Policy Benefit Reserves (Historical Claims Duration) (Details)
Dec. 31, 2021
Medical Professional Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.60%
Year 2 18.30%
Year 3 23.70%
Year 4 18.20%
Year 5 12.00%
Year 6 8.30%
Year 7 5.10%
Year 8 2.80%
Year 9 0.70%
Year 10 1.00%
Other Professional Liability and Management Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 6.70%
Year 2 21.90%
Year 3 21.10%
Year 4 16.70%
Year 5 9.90%
Year 6 6.40%
Year 7 4.30%
Year 8 3.50%
Year 9 1.70%
Year 10 0.50%
Surety | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 14.10%
Year 2 48.70%
Year 3 18.90%
Year 4 2.60%
Year 5 1.10%
Year 6 1.30%
Year 7 0.00%
Year 8 0.40%
Year 9 (0.80%)
Year 10 0.00%
Commercial Auto | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 26.70%
Year 2 23.20%
Year 3 18.00%
Year 4 13.60%
Year 5 10.10%
Year 6 3.20%
Year 7 1.50%
Year 8 0.40%
Year 9 0.00%
Year 10 0.30%
General Liability | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.10%
Year 2 14.10%
Year 3 18.00%
Year 4 19.00%
Year 5 13.50%
Year 6 8.70%
Year 7 5.60%
Year 8 4.10%
Year 9 2.20%
Year 10 0.80%
Workers' Compensation | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 14.70%
Year 2 21.70%
Year 3 13.90%
Year 4 9.50%
Year 5 6.40%
Year 6 2.70%
Year 7 1.10%
Year 8 1.50%
Year 9 0.40%
Year 10 0.50%
Excluding Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.00%
Year 2 23.70%
Year 3 10.80%
Year 4 7.40%
Year 5 6.10%
Year 6 5.70%
Year 7 6.80%
Year 8 2.60%
Year 9 1.60%
Year 10 1.20%
Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 20.40%
Year 2 36.10%
Year 3 13.40%
Year 4 6.90%
Year 5 4.40%
Year 6 3.90%
Year 7 1.00%
Year 8 0.60%
Year 9 0.70%