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SEGMENT REPORTING - Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 11,733,066 | $ 8,862,366 | $ 9,213,540
Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 100.00% | 100.00% | 100.00%
Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 4,823,731 | $ 3,562,414 | $ 3,734,241
Property | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 41.10% | 40.30% | 40.50%
Property | U.S. and Caribbean |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 2,996,981 | $ 2,303,013 | $ 2,343,830
Property | U.S. and Caribbean | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 25.50% | 26.00% | 25.50%
Property | Worldwide |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 1,063,292 | $ 798,623 | $ 1,053,369
Property | Worldwide | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 9.10% | 9.00% | 11.40%
Property | Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 244,523 | $ 163,500 | $ 62,998
Property | Europe | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 2.10% | 1.90% | 0.70%
Property | Worldwide (excluding U.S.) |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 180,688 | $ 70,646 | $ 37,436
Property | Worldwide (excluding U.S.) | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 1.50% | 0.80% | 0.40%
Property | Japan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 106,533 | $ 85,823 | $ 104,767
Property | Japan | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 0.90% | 1.00% | 1.10%
Property | Australia and New Zealand |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 101,976 | $ 70,107 | $ 86,080
Property | Australia and New Zealand | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 0.90% | 0.80% | 0.90%
Property | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 129,738 | $ 70,702 | $ 45,761
Property | Other | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 1.10% | 0.80% | 0.50%
Casualty and Specialty |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 6,909,335 | $ 5,299,952 | $ 5,479,299
Casualty and Specialty | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 58.90% | 59.70% | 59.50%
Casualty and Specialty | U.S. and Caribbean |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 2,986,956 | $ 2,333,096 | $ 2,556,466
Casualty and Specialty | U.S. and Caribbean | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 25.50% | 26.30% | 27.70%
Casualty and Specialty | Worldwide |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 3,217,662 | $ 2,280,687 | $ 2,328,030
Casualty and Specialty | Worldwide | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 27.30% | 25.70% | 25.30%
Casualty and Specialty | Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 353,863 | $ 197,228 | $ 327,831
Casualty and Specialty | Europe | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 3.00% | 2.20% | 3.60%
Casualty and Specialty | Worldwide (excluding U.S.) |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 195,489 | $ 130,334 | $ 177,746
Casualty and Specialty | Worldwide (excluding U.S.) | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 1.70% | 1.50% | 1.90%
Casualty and Specialty | Australia and New Zealand |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 43,183 | $ 27,397 | $ 35,973
Casualty and Specialty | Australia and New Zealand | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 0.40% | 0.30% | 0.40%
Casualty and Specialty | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 112,182 | $ 331,210 | $ 53,253
Casualty and Specialty | Other | Gross Premiums Written, Benchmark | Geographic Concentration Risk |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk , percentage | 1.00% | 3.70% | 0.60%

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