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Pension Plans - Fair Value of Plans Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
In respect of defined benefit plans:      
Total fair value of plan assets $ 274.2 $ 280.7 $ 423.4
Equities and growth funds      
In respect of defined benefit plans:      
Total fair value of plan assets 65.7 78.3  
Government bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 69.6 65.7  
Corporate bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 135.5 133.6  
Cash      
In respect of defined benefit plans:      
Total fair value of plan assets 3.4 3.1  
U.K.      
In respect of defined benefit plans:      
Total fair value of plan assets 274.2 252.6 376.6
U.K. | Equities and growth funds      
In respect of defined benefit plans:      
Total fair value of plan assets 65.7 78.3  
U.K. | Government bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 69.6 65.7  
U.K. | Corporate bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 135.5 106.1  
U.K. | Cash      
In respect of defined benefit plans:      
Total fair value of plan assets 3.4 2.5  
Foreign Plan      
In respect of defined benefit plans:      
Total fair value of plan assets 0.0 28.1 $ 46.8
Foreign Plan | Equities and growth funds      
In respect of defined benefit plans:      
Total fair value of plan assets 0.0 0.0  
Foreign Plan | Government bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 0.0 0.0  
Foreign Plan | Corporate bonds      
In respect of defined benefit plans:      
Total fair value of plan assets 0.0 27.5  
Foreign Plan | Cash      
In respect of defined benefit plans:      
Total fair value of plan assets $ 0.0 $ 0.6