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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (851,334) $ (450,607) $ (247,582)
Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   840  
Property      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (818,852) (408,905) (205,741)
Property | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 9,962   23,847
Property | Large and small catastrophe events and attritional loss movements      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (828,814) (409,745) (229,588)
Property | Large catastrophe events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (622,198) (309,820) (198,564)
Property | 2023 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (31,899)    
Property | 2022 Weather-Related Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (284,327) (85,653)  
Property | 2021 Weather-Related Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (180,028) (36,949) (12,387)
Property | 2020 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (47,512) (42,577) (24,589)
Property | 2019 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (14,445) (43,850) (97,034)
Property | 2018 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (38,295) (40,050) (20,318)
Property | 2017 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (25,692) (46,404) (39,481)
Property | Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   (14,337) (4,755)
Property | Small catastrophe events and attritional loss movements      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (206,616) (99,925) (31,024)
Property | Other small catastrophe events and attritional loss movements      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (206,616) (99,925) (31,024)
Property | Operating Segments      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (818,852) (408,905) (205,741)
Casualty and Specialty      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (32,482) (41,702) (41,841)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (67,595) (44,612) (63,353)
Casualty and Specialty | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 35,113 2,910 21,512
Casualty and Specialty | Operating Segments      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (32,482) $ (41,702) $ (41,841)