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Related Party Transactions (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]          
Services and other revenues $ 875,608 $ 735,872 $ 2,340,109 $ 2,037,991  
Premiums ceded 1,620,697 1,489,573 6,429,776 5,631,286  
Reinsurance recoverables 12,989,511   12,989,511   $ 11,604,844
Nephila Reinsurers [Member]          
Related Party Transaction [Line Items]          
Reinsurance recoverables 604,300   604,300   968,900
Hagerty, Inc. [Member]          
Related Party Transaction [Line Items]          
Gross premium volume 284,630 253,071 808,663 726,995  
Premiums ceded 219,309 193,844 623,453 557,581  
Reinsurance recoverables 328,900   328,900   $ 308,800
Industry Loss Warranties (ILW) Program | Nephila Reinsurers [Member]          
Related Party Transaction [Line Items]          
Gross premium volume 7,000   81,500 168,000  
Premiums ceded 7,000   81,500 168,000  
Fronting | Nephila Reinsurers [Member]          
Related Party Transaction [Line Items]          
Gross premium volume 162,900 94,300 1,800,000 1,200,000  
Premiums ceded 162,900 94,300 1,800,000 1,200,000  
Fund Management | Unconsolidated entities managed by Nephila [Member]          
Related Party Transaction [Line Items]          
Services and other revenues $ 30,300 $ 25,100 $ 85,000 $ 66,200