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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
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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%

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- Definition Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
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- Definition Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
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