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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Nov. 01, 2023
Dec. 31, 2021
Goodwill and Intangible Assets [Line Items]        
Amortization of intangible assets $ 13,600,000 $ 6,500,000    
Impairment of indefinite-lived intangible asset 0 0    
Validus        
Goodwill and Intangible Assets [Line Items]        
Identifiable intangible assets 453,066,000   $ 460,884,000  
Goodwill and Other Intangible Assets        
Goodwill and Intangible Assets [Line Items]        
Goodwill, gross 302,800,000 213,200,000   $ 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 15,300,000 14,400,000   $ 14,400,000
Goodwill, accumulated impairment loss $ 4,500,000 $ 4,500,000    
Low        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 3 months 18 days      
High        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 14 years 9 months 18 days      
Weighted Average or Actual        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 13 years 4 months 24 days