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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | $ (269,710) | $ (108,271) | $ (465,584) | $ (205,352)
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 |  |  | (453,634) | (179,058)
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 |  |  | (174,839) | (145,025)
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 |  |  | (10,415) |
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 |  |  | (52,710) | (20,720)
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 |  |  | (63,586) | (29,577)
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 |  |  | (27,372) | (56,537)
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 |  |  | (144) | (5,303)
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 |  |  | (1,074) | (5,724)
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 |  |  | (4,874) | (12,408)
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 |  |  | (14,664) | (14,756)
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 |  |  | (245,695) | (43,995)
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 |  |  | (420,534) | (189,020)
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses | (266,576) | (84,391) | (453,634) | (179,058)
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Total net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (11,950) | (26,294)
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 | 23,371
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 |  |  | (31,789) | (49,665)
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 | $ (3,134) | $ (23,880) | $ (11,950) | $ (26,294)

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