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Pension Plans - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
In respect of defined benefit plans:      
Net benefit surplus / (obligation) $ 49.2 $ 40.2  
Pension Protection Fund levy 0.1    
Total (credit) / expense for defined benefit plans (1.0) 7.9 $ 0.1
Defined benefit pension credit (1.6) 7.6 (0.1)
Defined benefit plan, expected amortization, next fiscal year 0.7    
Defined benefit plan, expected amortization of gain (loss), next fiscal year 1.1    
Defined benefit plan, expected amortization of prior service credit 0.4    
Settlement loss 0.0 (29.3)  
Contributions from employer 0.0 2.3  
Expected future employer contributions, next fiscal year 0.0 $ 0.0  
Minimum      
In respect of defined benefit plans:      
Change in technical pension provision basis   0.03  
Maximum      
In respect of defined benefit plans:      
Change in technical pension provision basis   0.04  
Selling, general and administrative expenses      
In respect of defined benefit plans:      
Total (credit) / expense for defined benefit plans (0.6) $ (0.3) (0.2)
U.K.      
In respect of defined benefit plans:      
Net benefit surplus / (obligation) 49.3 40.3  
Total (credit) / expense for defined benefit plans (1.0) (1.5) (2.8)
Settlement loss 0.0 0.0  
Contributions from employer $ 0.0 0.2  
U.K. | Defined benefit plan, equity securities      
In respect of defined benefit plans:      
Plan assets, target allocation percentage 25.00%    
U.S. / other      
In respect of defined benefit plans:      
Net benefit surplus / (obligation) $ (0.1) (0.1)  
Total (credit) / expense for defined benefit plans 0.0 9.4 $ 2.9
Settlement loss 0.0 (29.3)  
Plan assets, divestiture   27.2  
Contributions from employer $ 0.0 $ 2.1