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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2021
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 7.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 14.10%
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 16.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 13.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 8.70%
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 3.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 2.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.90%
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 23.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 29.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.90%
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 5.60%
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 2.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 1.50%
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 7.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 19.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 18.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 15.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 9.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 10.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 2.90%
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 0.30%
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 37.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 21.00%
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 11.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 6.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.20%
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%
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 55.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 33.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 6.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 1.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 0.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.60%
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 6.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 11.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 13.30%
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 10.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 9.50%
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 5.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 5.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.30%
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 5.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 4.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 2.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 1.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 2.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 4.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 6.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.80%
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 30.70%
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 15.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 6.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 3.70%
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 1.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 1.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 1.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.90%