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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2022
Insurance | Other liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 6.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 13.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 16.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 16.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 13.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 9.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 6.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 4.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.80%
Insurance | Workers' compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 23.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 29.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 9.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 2.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 1.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 1.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.00%
Insurance | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 7.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 17.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 17.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 15.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 9.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 10.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 5.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 2.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 3.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.90%
Insurance | Commercial automobile  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 36.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 20.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 11.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 6.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.40%
Insurance | Short-tail lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 54.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 32.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 5.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 0.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%
Reinsurance & Monoline Excess | Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 5.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 10.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 12.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 13.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 11.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 9.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 7.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 4.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 3.00%
Reinsurance & Monoline Excess | Monoline excess  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 6.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 4.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 3.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 1.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 2.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 4.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 7.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.90%
Reinsurance & Monoline Excess | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 30.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 33.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 16.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 3.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 1.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%