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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2016
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 7.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 14.00%
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 16.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 13.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 8.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 6.30%
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 3.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 3.10%
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 22.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 27.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.20%
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 4.80%
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 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 1.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.20%
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 1.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 3.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 3.30%
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 3.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 4.30%
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 4.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.70%
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 8.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 26.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 23.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 17.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 9.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 5.20%
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 1.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.90%
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 40.10%
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 10.60%
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 3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.50%
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 58.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 28.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 6.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 2.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 0.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 0.50%
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 0.40%
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 12.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 15.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 12.50%
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 6.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8 5.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 5.10%
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 37.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 35.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 15.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 6.20%
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 1.30%
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 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 0.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.50%