RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Liability for Unpaid Claims and Claim Expenses (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
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| Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] | |||||
| Reserve for claims and claim expenses, net of reinsurance recoverable, beginning of period | $ 18,402,432 | $ 16,822,101 | |||
| Net incurred related to: | |||||
| Current year | $ 1,293,637 | $ 1,258,871 | 3,581,426 | 5,510,336 | |
| Prior years | (267,145) | (380,051) | (628,585) | (845,635) | |
| Total net incurred | 1,026,492 | 878,820 | 2,952,841 | 4,664,701 | |
| Net paid related to: | |||||
| Current year | 202,872 | 763,095 | |||
| Prior years | 2,656,060 | 2,373,183 | |||
| Total net paid | 2,858,932 | 3,136,278 | |||
| Foreign exchange and other | (30,408) | 277,243 | |||
| Reserve for claims and claim expenses, net of reinsurance recoverable, end of period | 18,465,933 | 18,627,767 | 18,465,933 | 18,627,767 | |
| Reinsurance recoverable, end of period | 3,828,262 | 4,085,093 | 3,828,262 | 4,085,093 | $ 3,899,913 |
| Reserve for claims and claim expenses, end of period | $ 22,294,195 | $ 22,712,860 | $ 22,294,195 | $ 22,712,860 | |
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of foreign currency gain (loss) which decreases (increases) the cost of settling unpaid claims after deduction of reinsurance recoveries. Includes, but is not limited to, claims which have been incurred but not reported. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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