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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2023
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 6.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 13.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 15.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 12.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 10.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 7.50%
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 4.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 3.30%
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 24.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 30.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 16.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 9.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 5.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 2.30%
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 1.40%
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 7.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 17.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 17.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 14.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 9.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 9.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 5.80%
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 4.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.00%
Insurance | Auto  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 34.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 20.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 11.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 7.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.60%
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 0.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.30%
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 54.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 33.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 2.80%
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 0.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.50%
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 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.30%
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 4.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 10.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 11.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 13.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 11.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 10.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 8.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 5.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 4.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 3.70%
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 7.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 5.10%
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 2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 3.40%
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 4.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 3.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 3.50%
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 28.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 33.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 17.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 1.60%
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 0.60%
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%