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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
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)