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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Liability for Catastrophe Claims [Line Items]        
Total net (favorable) adverse development of prior accident years net claims and claim expenses $ (380,051) $ (292,506) $ (845,635) $ (497,858)
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     (837,307) (470,801)
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     (433,836) (330,048)
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     (43,057)  
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     (77,391) (21,316)
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     (207,672) (137,657)
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     (29,458) (69,618)
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     (10,629) (35,514)
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     (8,233) (15,864)
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     (20,089) (32,448)
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     (37,307) (17,631)
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     (370,371) (150,715)
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     (804,207) (480,763)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Total net (favorable) adverse development of prior accident years net claims and claim expenses     (8,328) (27,057)
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 35,113
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     (28,167) (62,170)
Operating Segments | Property        
Liability for Catastrophe Claims [Line Items]        
Total net (favorable) adverse development of prior accident years net claims and claim expenses (383,673) (291,743) (837,307) (470,801)
Operating Segments | Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Total net (favorable) adverse development of prior accident years net claims and claim expenses $ 3,622 $ (763) $ (8,328) $ (27,057)