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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Nov. 01, 2023 | Dec. 31, 2022
Goodwill and Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 57,600,000 | $ 13,600,000 |  |
Impairment of indefinite-lived intangible asset | $ 13,800,000 | 0 |  |
Impairment Intangible Asset, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag | intangible asset impairment charge |  |  |
Intangible asset impairment | $ 13,800,000 |  |  |
Validus |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Identifiable intangible assets |  | 386,628,000 | $ 460,884,000 |
Validus | Insurance licenses |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Identifiable indefinite lived intangible assets (insurance licenses) |  |  | $ 13,884,000 |
Goodwill and Other Intangible Assets |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill, gross | 302,800,000 | 302,800,000 |  | $ 213,200,000
Goodwill, accumulated impairment loss | 2,300,000 | 2,300,000 |  |
Goodwill and Other Intangible Assets Included in Investments in Other Ventures, Under Equity Method |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill, gross | 13,200,000 | 15,300,000 |  | $ 14,400,000
Goodwill, accumulated impairment loss | 4,500,000 | $ 4,500,000 |  |
Reduction in goodwill | 2,100,000 |  |  |
Reduction in gross other intangible assets | $ (6,900,000) |  |  |
Minimum |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 2 months 12 days |  |  |
Maximum |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 13 years 9 months 18 days |  |  |
Weighted Average or Actual |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 12 years 8 months 12 days |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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