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Reserve For Losses, LAE And Future Policy Benefit Reserve (Average Annual Percentage Payout Incurred Claims By Age, Net Of Reinsurance) (Details)
Dec. 31, 2020
Reinsurance [Member] | Casualty Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 9.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 9.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 12.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 14.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 12.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 10.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 8.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 4.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 1.90%
Reinsurance [Member] | Property Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 29.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 31.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 15.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 9.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 3.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 1.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 0.50%
Insurance [Member] | Casualty Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 8.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 19.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 17.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 14.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 10.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 6.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 4.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 1.40%
Insurance [Member] | Property Business [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One 54.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two 33.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three 4.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four 3.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five 2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven 0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight 0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Nine 0.20%