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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2018
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 8.00%
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 16.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 13.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 8.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 5.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.80%
Insurance | Primary 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 22.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 27.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 9.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 5.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 4.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 1.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.10%
Insurance | Excess 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 3.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 2.70%
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 3.00%
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 2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.60%
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 22.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 22.30%
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 9.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 9.10%
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 1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 4.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.50%
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 39.70%
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 15.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 10.70%
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 3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 1.00%
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 0.20%
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 59.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 29.80%
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 1.60%
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 0.30%
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 0.30%
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 1.40%
Reinsurance | Casualty  
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 12.50%
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 13.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 11.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 9.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 5.90%
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 3.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.80%
Reinsurance | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1 35.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 32.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 14.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 3.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 3.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 2.70%
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 3.20%