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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (108,271) $ (32,098) $ (205,352) $ (136,850)
Property        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (179,058) (113,332)
Property | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     9,962  
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (145,025) (73,780)
Property | 2023 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (20,720)  
Property | 2022 Weather-Related Large Losses        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (29,577) 25,994
Property | 2021 Weather-Related Large Lossses        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (56,537) (31,000)
Property | 2020 Weather-Related Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (5,303) (3,077)
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (5,724) (22,636)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (12,408) (24,059)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (14,756) (18,382)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses       (620)
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (34,033) (39,552)
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (43,995) (39,552)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses (84,391) (31,639) (179,058) (113,332)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (26,294) (23,518)
Casualty and Specialty | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     23,371 2,910
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (49,665) (26,428)
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (23,880) $ (459) $ (26,294) $ (23,518)