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Reinsurance - Unsecured Reinsurance Recoverable and Prepaid Reinsurance Premium Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium $ 371.4 $ 356.0
Other reinsurers    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 143.1 160.3
A+    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 228.3 195.7
A+ | Munich Reinsurance America, Inc.    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 60.0 34.3
A+ | Hannover Rück SE    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 56.9 49.9
A+ | Everest Reinsurance Company    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 41.6 55.3
A+ | Digital Advantage Insurance Company    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 24.1 19.4
A+ | Swiss Reinsurance America Corporation    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 18.3 14.0
A+ | Partner Reinsurance Company of the U.S.    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium 14.9 15.0
A+ | Sirius America Insurance Company    
Ceded Credit Risk [Line Items]    
Unsecured reinsurance recoverable and prepaid reinsurance premium $ 12.5 $ 7.8