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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Reserve for Claims and Claim Expenses by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | $ 5,276,672 | $ 4,926,309 |
ACR | 2,110,214 | 2,200,627 |
IBNR | 15,325,974 | 14,176,555 |
Total | 22,712,860 | 21,303,491 | $ 21,221,194
Operating Segments | Property |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 1,910,587 | 1,845,228 |
ACR | 1,833,077 | 1,905,553 |
IBNR | 2,516,670 | 2,821,958 |
Total | 6,260,334 | 6,572,739 |
Operating Segments | Casualty and Specialty |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 3,366,085 | 3,081,081 |
ACR | 277,137 | 295,074 |
IBNR | 12,809,304 | 11,354,597 |
Total | $ 16,452,526 | $ 14,730,752 |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References No definition available. + Details
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