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SEGMENT INFORMATION - Summary of Gross Premiums Written by Geographical Location of Subsidiaries (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | $ 9,005,888 | $ 8,356,525 | $ 8,214,595
U.S. |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 4,864,074 | 4,484,789 | 4,342,707
Ireland |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 1,923,006 | 1,837,177 | 1,931,815
Lloyd's of London |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 1,998,217 | 1,759,990 | 1,567,458
Bermuda |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | $ 220,591 | $ 274,569 | $ 372,615

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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