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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Prior Year Development of the Reserve for Net Claims and Claim Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (32,098) $ (42,957) $ (136,850) $ (60,790)
Property        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (113,332) (51,810)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (73,780) (67,344)
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     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     (31,000) 4,385
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     (3,077) (10,887)
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (22,636) (25,821)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (24,059) (10,300)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (18,382) (22,143)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (620) (2,578)
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     (39,552) 15,534
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     (39,552) 15,534
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses (31,639) (35,052) (113,332) (51,810)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (23,518) (8,980)
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     (26,428) (27,315)
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     2,910 18,335
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (459) $ (7,905) $ (23,518) $ (8,980)