v3.26.3
Derivatives - Classification and Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Derivative [Line Items]    
Derivative liabilities at fair value $ 24.6 $ 9.0
Foreign currency forwards | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative assets at fair value 2.1 13.8
Derivative liabilities at fair value 21.0 3.6
Notional Value 758.5 853.7
Interest rate swaps | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative assets at fair value 0.0 0.0
Derivative liabilities at fair value 0.0 0.0
Notional Value 0.0 29.8
Credit default swap | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative assets at fair value 0.5 0.6
Derivative liabilities at fair value 0.0 0.0
Notional Value 73.1 73.1
Reinsurance contracts accounted for as derivatives | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative assets at fair value 0.0 0.0
Derivative liabilities at fair value 3.6 5.4
Notional Value $ 91.6 $ 77.7