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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (31,906) $ (147,650) $ (92,696) $ (208,711)
Property        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (76,069) (202,080)
Property | Large and 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     (76,069) (202,080)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (81,976) (160,586)
Property | 2021 Weather-Related Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     42,766  
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     (32,988) 16,939
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (50,148) (40,582)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (15,493) (99,337)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (28,722) (38,220)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     2,609 614
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     5,907 (41,494)
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     5,907 (41,494)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses (24,259) (145,935) (76,069) (202,080)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (16,627) (6,631)
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     (38,139) (9,612)
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     21,512 2,981
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (7,647) $ (1,715) $ (16,627) $ (6,631)