v3.26.1
Derivatives - Classification and Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivative [Line Items]    
Derivative liabilities at fair value $ 29.1 $ 9.0
Derivatives not designated as hedging instruments | Foreign currency forwards    
Derivative [Line Items]    
Derivative assets at fair value 5.7 13.8
Derivative liabilities at fair value 22.4 3.6
Notional Value 823.8 853.7
Derivatives not designated as hedging instruments | Interest rate swaps    
Derivative [Line Items]    
Derivative assets at fair value 0.0 0.0
Derivative liabilities at fair value 0.0 0.0
Notional Value 29.8 29.8
Derivatives not designated as hedging instruments | Credit default swap    
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
Derivatives not designated as hedging instruments | Reinsurance contracts accounted for as derivatives    
Derivative [Line Items]    
Derivative assets at fair value 0.0 0.0
Derivative liabilities at fair value 6.7 5.4
Notional Value $ 90.3 $ 77.7