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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Jul. 18, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2018
Dec. 27, 2018
Reinsurance Retention Policy [Line Items]              
Reinsurance recoverable on unpaid losses     $ 520,520   $ 0    
Reinsurance recoverable, allowance for credit loss     1,655 $ 0 $ 0    
Reinsurance, excess retention, amount reinsured, per policy $ 2,178,535            
Reinsurance, amount retained, per policy 600,000            
Reinsurance recoverable for paid and unpaid claims and claims adjustments, adverse development cover           $ 155,000  
Collateral by third party     432,202        
Cavello | Subsequent Event              
Reinsurance Retention Policy [Line Items]              
Reinsurance recoverable on unpaid losses   $ 46,700          
Additional claims estimated   $ 25,000          
Maximum              
Reinsurance Retention Policy [Line Items]              
Reinsurance recoverables on paid losses, gross     312,786        
Diversified Legacy Reinsurance              
Reinsurance Retention Policy [Line Items]              
Reinsurance recoverable on unpaid losses     36,195        
Reinsurance recoverable, allowance for credit loss     780        
Assets and liabilities associated with reinsurance business retroceded             100.00%
AmTrust Reinsurance              
Reinsurance Retention Policy [Line Items]              
Reinsurance recoverable on unpaid losses $ 445,000            
Reinsurance recoverable, allowance for credit loss     707        
Reinsurance Recoverables on Unpaid Losses, Gross     $ 481,747