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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2019
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 7.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 14.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 18.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 16.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 14.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 8.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 5.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 2.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.50%
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 23.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 28.70%
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 9.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 6.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 2.70%
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 8.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 21.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 21.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 15.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 9.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 8.90%
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 2.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 3.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.60%
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 39.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 21.60%
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 10.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 6.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 3.00%
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 0.30%
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 58.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 30.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 5.70%
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 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 0.50%
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 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.00%
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 6.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 12.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 14.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 13.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 11.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 8.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 6.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 5.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 3.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.90%
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 4.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 3.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 3.10%
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 3.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 2.70%
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 3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 6.10%
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 34.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 31.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 14.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.90%
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 2.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 2.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%