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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (292,506) $ (157,947) $ (497,858) $ (294,797)
Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses       840
Property        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (470,801) (257,209)
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     (330,048) (164,658)
Property | 2023 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (21,316)  
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     (137,657) 6,501
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     (69,618) (24,931)
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     (35,514) (28,824)
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (15,864) (37,934)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (32,448) (37,847)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (17,631) (31,922)
Property | New Zealand Earthquake (2010)        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses       (10,397)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses       696
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     (140,753) (92,551)
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     (150,715) (93,391)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses (291,743) (143,877) (470,801) (257,209)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (27,057) (37,588)
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     35,113 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     (62,170) (40,498)
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (763) $ (14,070) $ (27,057) $ (37,588)