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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)