v3.25.1
Investments - Schedule of Realized Gains and Losses of Investment on Foreign Currency Exchange Forward Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Investments [Line Items]    
Gross realized investment gains $ 2.6 $ 2.0
Foreign Currency Exchange Forward Contracts    
Schedule of Investments [Line Items]    
Gross realized investment gains 0.0 2.6
Gross realized investment losses (4.1) (2.7)
Net realized investment (losses) gains on foreign currency exchange forward contracts (4.1) (0.1)
Foreign Currency Exchange Forward Contracts | Operational currency    
Schedule of Investments [Line Items]    
Gross realized investment gains 0.0 1.4
Gross realized investment losses 0.0 (2.7)
Foreign Currency Exchange Forward Contracts | Asset manager investment exposure    
Schedule of Investments [Line Items]    
Gross realized investment gains 0.0 1.2
Gross realized investment losses $ (4.1) $ 0.0