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Reinsurance and Retrocessional Reinsurance (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Insurance [Abstract]        
Reinsurance recoverable on reserves for losses and loss adjustment expenses $ 1,243.8 $ 1,195.6 $ 1,491.9 $ 1,255.6
Reinsurance recoverable for paid claims and claims adjustments 419.9 438.7    
Reinsurance recoverables on paid losses, allowance 0.3 0.3    
Reinsurance recoverables on unpaid losses, allowance $ 0.9 $ 0.9