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Liabilities For Outstanding Claims, Losses And Loss Adjustment Expenses (Computation of Historical Claims on Paid and Incurred Claims Data, Net of Reinsurance) (Details)
Dec. 31, 2018
Commercial Multiple Peril Line [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 34.00%
2 22.70%
3 10.70%
4 10.00%
5 7.20%
6 4.70%
7 2.50%
Workers' Compensation Line [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 20.00%
2 27.00%
3 15.90%
4 9.60%
5 5.60%
6 3.50%
7 2.40%
8 1.40%
9 1.40%
10 0.80%
Commercial Automobile Line [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 16.90%
2 21.70%
3 20.10%
4 18.30%
5 13.70%
6 6.20%
General Liability And Umbrella - Occurrence [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 3.40%
2 11.70%
3 19.40%
4 20.10%
5 15.30%
6 10.60%
7 3.50%
8 4.90%
General Liability - Claims Made [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 12.60%
2 34.40%
3 24.30%
4 12.90%
5 4.80%
6 1.70%
Personal Automobile Lines [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 32.50%
2 28.40%
3 18.30%
4 12.20%
5 6.10%
Homeowners [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
1 69.20%
2 21.80%
3 3.40%
4 2.50%