v3.26.3
Surplus Note - Carrying Amount of Surplus Note (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Less: unamortized debt issuance costs $ (2.1) $ (2.1)
Surplus note 47.9 47.9
Level 3    
Debt Instrument [Line Items]    
Surplus note 46.9  
Unsecured Debt | Surplus Note    
Debt Instrument [Line Items]    
Surplus note issued $ 50.0 $ 50.0