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Pension Plans - Additional Information (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
In respect of defined benefit plans:        
Net benefit surplus / (obligation)   $ 40.2 $ 22.5  
Benefits paid   13.5 15.3  
Contributions from employer   2.3 0.4  
Total (credit) / expense for defined benefit plans   7.9 0.1 $ (1.9)
Defined benefit pension credit   (7.6) 0.1 2.3
Defined benefit plan, expected amortization, next fiscal year   1.0    
Defined benefit plan, expected amortization of gain (loss), next fiscal year   1.4    
Defined benefit plan, expected amortization of prior service credit   0.4    
Settlement loss   (29.3) (5.9)  
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   $ (0.3) (0.2) (0.4)
U.K.        
In respect of defined benefit plans:        
Net benefit surplus / (obligation)   40.3 27.0  
Benefits paid $ 12.7 12.6 12.8  
Contributions from employer   0.2 0.4  
Total (credit) / expense for defined benefit plans   (1.5) (2.8) (1.6)
Settlement loss   $ 0.0 0.0  
U.K. | Defined benefit plan, equity securities        
In respect of defined benefit plans:        
Plan assets, target allocation percentage   20.00%    
U.S. / other        
In respect of defined benefit plans:        
Net benefit surplus / (obligation)   $ (0.1) (4.5)  
Benefits paid   0.9 2.5  
Contributions from employer   2.1 0.0  
Total (credit) / expense for defined benefit plans   9.4 2.9 $ (0.3)
Settlement loss   (29.3) $ (5.9)  
Plan assets, divestiture   $ 27.2