v3.25.2
Derivatives - Classification and Net Impact on Earnings of Derivatives (Details) - Derivatives not designated as hedging instruments - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Foreign currency forwards        
Derivative Instruments, Gain (Loss) [Line Items]        
Net impact on earnings $ 33.4 $ 6.0 $ 74.3 $ (11.5)
Weather derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Net impact on earnings 0.2 (0.3) 0.4 (1.8)
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Net impact on earnings (0.3) 0.4 (0.5) 1.7
Reinsurance contracts accounted for as derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Net impact on earnings $ (0.1) $ 5.1 $ (0.1) $ 0.3