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Derivatives - Classification and Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative liabilities at fair value $ 6.1 $ 14.3
Derivatives not designated as hedging instruments | Foreign currency forwards    
Derivative [Line Items]    
Derivative assets at fair value 27.8 0.9
Derivative liabilities at fair value 0.9 3.3
Notional Value 843.8 768.6
Derivatives not designated as hedging instruments | Weather derivatives    
Derivative [Line Items]    
Derivative assets at fair value 0.0 0.0
Derivative liabilities at fair value 0.0 5.6
Notional Value 0.0 3.7
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 0.0 0.0
Derivative liabilities at fair value 0.2 0.5
Notional Value 55.9 49.1
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 5.0 4.9
Notional Value $ 74.7 $ 100.1