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Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
May 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance $ 4,577.8      
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance, Ending Balance 4,172.0 $ 4,577.8    
Provision for losses and LAE for claims incurred 35.6 60.8 $ 28.1  
Reinsurance Contracts [Axis]: LPT        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Reinsurance recoverables, premium paid and recognized       $ 1,840.1
Reinsurance Contracts [Axis]: Retroactive Reinsurance        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance 1,627.4      
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance, Ending Balance $ 1,190.9 $ 1,627.4