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ACQUISITION OF VALIDUS - Schedule of Identifiable Intangible Assets (Details) - Validus - USD ($) $ in Thousands |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2023 | Dec. 31, 2023 | Dec. 31, 2024
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Gross identifiable intangible assets related to the acquisition of Validus, at November 1, 2023 |  |  | $ 386,628
Accumulated amortization (from November 1, 2023 through December 31, 2024), net of foreign exchange |  | $ 60,489 |
Impairment loss on insurance licenses |  |  | 13,767
Net identifiable intangible assets related to the acquisition of Validus at December 31, 2024 | $ 460,884 | $ 386,628 |
Insurance licenses |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired | 13,884 |  |
Agent relationships - top four |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid reinsurance premiums | $ 195,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 15 years |  |
Agent relationships - other |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid reinsurance premiums | $ 9,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 5 years |  |
Managing General Agent (“MGA”) relationships |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid reinsurance premiums | $ 3,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 15 years |  |
Trade name |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid reinsurance premiums | $ 5,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 6 months |  |
Renewal rights |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid reinsurance premiums | $ 215,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 15 years |  |
Asset management contracts |  |  |
Business Acquisition [Line Items] |  |  |
Prepaid reinsurance premiums | $ 20,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 4 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details
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