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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | $ (380,051) | $ (292,506) | $ (845,635) | $ (497,858)
Actuarial assumption changes |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses |  |  |  | 9,962
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (837,307) | (470,801)
Property | Actuarial assumption changes |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (33,100) |
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (433,836) | (330,048)
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 |  |  | (43,057) |
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 |  |  | (77,391) | (21,316)
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 |  |  | (207,672) | (137,657)
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 |  |  | (29,458) | (69,618)
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 |  |  | (10,629) | (35,514)
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 |  |  | (8,233) | (15,864)
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 |  |  | (20,089) | (32,448)
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 |  |  | (37,307) | (17,631)
Property | Total other 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 |  |  | (370,371) | (150,715)
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 |  |  | (804,207) | (480,763)
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (8,328) | (27,057)
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 |  |  | 19,839 | 35,113
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 |  |  | (28,167) | (62,170)
Operating Segments | Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (383,673) | (291,743) | (837,307) | (470,801)
Operating Segments | Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | $ 3,622 | $ (763) | $ (8,328) | $ (27,057)

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