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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Nov. 01, 2023
Dec. 31, 2022
Goodwill and Intangible Assets [Line Items]        
Amortization of intangible assets $ 57,600,000 $ 13,600,000    
Impairment of indefinite-lived intangible asset $ 13,800,000 0    
Impairment Intangible Asset, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag intangible asset impairment charge      
Intangible asset impairment $ 13,800,000      
Validus        
Goodwill and Intangible Assets [Line Items]        
Identifiable intangible assets   386,628,000 $ 460,884,000  
Validus | Insurance licenses        
Goodwill and Intangible Assets [Line Items]        
Identifiable indefinite lived intangible assets (insurance licenses)   $ 13,884,000  
Goodwill and Other Intangible Assets        
Goodwill and Intangible Assets [Line Items]        
Goodwill, gross 302,800,000 302,800,000   $ 213,200,000
Goodwill, accumulated impairment loss 2,300,000 2,300,000    
Goodwill and Other Intangible Assets Included in Investments in Other Ventures, Under Equity Method        
Goodwill and Intangible Assets [Line Items]        
Goodwill, gross 13,200,000 15,300,000   $ 14,400,000
Goodwill, accumulated impairment loss 4,500,000 $ 4,500,000    
Reduction in goodwill 2,100,000      
Reduction in gross other intangible assets $ (6,900,000)      
Minimum        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 2 months 12 days      
Maximum        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 13 years 9 months 18 days      
Weighted Average or Actual        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 12 years 8 months 12 days