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Claim and Claim Adjustment Expense Reserves (Historical Claims Duration) (Details)
Dec. 31, 2020
Medical Professional Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.70%
Year 2 19.50%
Year 3 24.00%
Year 4 18.40%
Year 5 12.20%
Year 6 8.20%
Year 7 5.20%
Year 8 3.10%
Year 9 0.90%
Year 10 4.10%
Other Professional Liability and Management Liability | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 7.00%
Year 2 22.90%
Year 3 21.40%
Year 4 16.30%
Year 5 10.10%
Year 6 6.60%
Year 7 4.40%
Year 8 2.30%
Year 9 3.00%
Year 10 2.60%
Surety | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.30%
Year 2 44.60%
Year 3 20.00%
Year 4 3.50%
Year 5 2.20%
Year 6 1.20%
Year 7 (0.70%)
Year 8 0.90%
Year 9 (1.40%)
Year 10 0.00%
Commercial Auto | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 27.90%
Year 2 24.00%
Year 3 18.30%
Year 4 14.00%
Year 5 9.80%
Year 6 2.90%
Year 7 1.30%
Year 8 0.50%
Year 9 0.00%
Year 10 0.30%
General Liability | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.20%
Year 2 15.00%
Year 3 18.90%
Year 4 20.30%
Year 5 14.30%
Year 6 9.10%
Year 7 5.70%
Year 8 3.20%
Year 9 2.60%
Year 10 0.30%
Workers' Compensation | Commercial  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 14.50%
Year 2 21.90%
Year 3 14.20%
Year 4 10.10%
Year 5 6.40%
Year 6 3.50%
Year 7 2.10%
Year 8 1.10%
Year 9 0.90%
Year 10 0.30%
Excluding Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.80%
Year 2 25.60%
Year 3 11.00%
Year 4 7.20%
Year 5 6.20%
Year 6 5.40%
Year 7 6.90%
Year 8 2.90%
Year 9 1.10%
Year 10 0.90%
Hardy | International  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.00%
Year 2 37.50%
Year 3 12.80%
Year 4 6.30%
Year 5 4.70%
Year 6 2.40%
Year 7 1.90%
Year 8 1.40%