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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Prior Year Development of the Reserve for Net Claims and Claim Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | $ (195,874) | $ (97,081)
Property |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (187,058) | (94,667)
Property | Large catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (69,664) | (70,163)
Property | 2024 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | 460 |
Property | 2023 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (10,936) | 1,569
Property | 2022 Weather-Related Large Losses |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (25,570) | (8,574)
Property | 2021 Weather-Related Large Losses |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (18,143) | (36,228)
Property | 2020 Weather-Related Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (1,536) | (6,128)
Property | 2019 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | 613 | (4,053)
Property | 2018 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (5,388) | (9,461)
Property | 2017 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (9,164) | (7,288)
Property | Total small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (117,394) | (24,504)
Property | Total catastrophe and attritional net claims and claim expenses |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (187,058) | (94,667)
Property | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (187,058) | (94,667)
Casualty and Specialty |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (8,816) | (2,414)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (8,816) | (2,414)
Casualty and Specialty | Actuarial assumption changes |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | 0 | 0
Casualty and Specialty | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | $ (8,816) | $ (2,414)

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