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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES - Average Historical Claims Duration (Details) | Dec. 31, 2025
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Commercial other liability |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 7.10%
Year 2 | 14.10%
Year 3 | 14.10%
Year 4 | 16.50%
Year 5 | 10.20%
Year 6 | 9.00%
Year 7 | 8.10%
Year 8 | 5.60%
Year 9 | 4.40%
Year 10 | 9.40%
Commercial fire and allied |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 58.60%
Year 2 | 22.00%
Year 3 | 6.90%
Year 4 | 3.90%
Year 5 | 2.70%
Year 6 | 1.40%
Year 7 | 0.40%
Year 8 | 0.00%
Year 9 | 0.40%
Year 10 | 0.00%
Commercial automobile |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 35.70%
Year 2 | 21.30%
Year 3 | 17.30%
Year 4 | 11.80%
Year 5 | 7.80%
Year 6 | 3.20%
Year 7 | 1.60%
Year 8 | 0.40%
Year 9 | 0.50%
Year 10 | 0.00%
Commercial workers' compensation |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 34.40%
Year 2 | 31.70%
Year 3 | 13.80%
Year 4 | 8.20%
Year 5 | 4.10%
Year 6 | 2.50%
Year 7 | 1.50%
Year 8 | 1.10%
Year 9 | 0.10%
Year 10 | 0.40%
Personal |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |
Year 1 | 51.30%
Year 2 | 35.20%
Year 3 | 13.80%
Year 4 | 2.20%
Year 5 | 0.60%
Year 6 | 0.30%
Year 7 | 0.50%
Year 8 | 0.10%
Year 9 | 0.40%
Year 10 | 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 fourth 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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