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Reinsurance and Retrocessional Reinsurance (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Insurance [Abstract]        
Reinsurance recoverable on reserves for losses and loss adjustment expenses $ 1,131.8 $ 1,255.6 $ 1,164.9 $ 1,108.6
Reinsurance recoverable for paid claims and claims adjustments 380.1 278.4    
Reinsurance recoverables on paid losses, allowance 0.2 0.2    
Reinsurance recoverables on unpaid losses, allowance $ 0.8 $ 0.8