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Reserves for Losses and Adjustment Expenses Short-duration Contracts - Historical Claims Duration (Details) | Dec. 31, 2024
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Property Insurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 29.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 38.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 13.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 12.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 3.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (5.80%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | 0.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | 0.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%
Casualty Insurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 4.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 19.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 32.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 23.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 3.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (3.60%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (2.10%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | 0.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%
Marine, Aviation and Energy Insurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 23.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 34.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 19.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 11.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 2.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (0.90%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (1.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%
Financial and Professional Insurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 14.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 28.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 19.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 14.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 4.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (4.80%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (2.90%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (1.30%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%
Property Catastrophe and Other Property Reinsurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 21.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 42.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 16.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 6.90%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 3.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (1.90%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (0.10%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.80%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%
Casualty Reinsurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 6.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 19.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 21.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 19.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 11.80%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (5.00%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (1.80%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | 0.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%
Specialty Reinsurance |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One | 26.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 32.80%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 12.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 7.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 3.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | (0.60%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (0.90%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten | 0.00%

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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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G + 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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G + 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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G + 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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G + Details
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- Definition Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G + Details
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- Definition Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4G + Details
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