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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)
Dec. 31, 2017
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 14.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 18.30%
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 13.90%
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 5.70%
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 2.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.60%
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 27.30%
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 9.40%
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 4.00%
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 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.50%
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 3.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 2.30%
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 3.20%
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 3.30%
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 3.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 3.90%
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 9.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 23.90%
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 16.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 9.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 6.40%
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 2.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 2.30%
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 40.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 21.70%
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 10.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 6.30%
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 0.90%
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 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.40%
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 60.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2 29.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3 5.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 1.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6 0.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7 0.30%
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 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 0.00%
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 7.00%
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 14.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 12.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5 10.80%
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 5.90%
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 5.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 4.90%
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 34.80%
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 14.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4 5.20%
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 2.50%
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 3.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9 1.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10 1.00%