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Pension Plans - Fair Value of Plans Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
In respect of defined benefit plans:      
Total fair value of plan assets $ 268.2 $ 254.3 $ 274.2
Equities and growth funds      
In respect of defined benefit plans:      
Total fair value of plan assets 0.0 70.1  
Government bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 209.2 76.6  
Corporate bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 0.0 105.3  
Cash      
In respect of defined benefit plans:      
Total fair value of plan assets $ 59.0 $ 2.3