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Reserves for Losses and Adjustment Expenses Short-duration Contracts - Historical Claims Duration (Details) | Dec. 31, 2023
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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 | 30.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 39.00%
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 | 6.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 2.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | 2.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (0.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.30%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | (0.70%)
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 | 18.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 33.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 24.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 2.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | 1.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (5.10%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.40%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | (0.10%)
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 | 22.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 33.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 21.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 11.40%
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 | 3.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (2.80%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | (0.40%)
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 | 12.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 28.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 20.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 16.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 5.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | 6.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (4.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (1.40%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | (0.30%)
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 | 22.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 45.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 16.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 5.80%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 2.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | 1.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (0.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (0.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine | (0.10%)
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 | 6.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 19.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 22.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 19.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 12.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | 8.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (5.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight | (1.70%)
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 | 27.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two | 34.90%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three | 14.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four | 7.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five | 3.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six | 1.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven | (0.50%)
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%

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -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 fourth 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 -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4G -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G + Details
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