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Pension and Post-Employment Benefits - Movements in PBO and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair value of plan assets:        
Opening balance   $ 2.4    
Closing balance   0.0 $ 2.4  
United Kingdom Plan [Member]        
Fair value of plan assets:        
Opening balance   2.5 459.2  
Return of funds to cover historic expenses $ 8.4 (0.9) (8.4)  
Scheme closure expenses   (1.6) 0.0  
Benefits paid   0.0 (32.9)  
Actual return on assets   0.0 1.5  
Settlements   0.0 (419.2)  
Exchange effect   0.0 2.3  
Closing balance   0.0 2.5 $ 459.2
German Plan [Member]        
Change in PBO:        
Opening balance   9.0 9.1  
Interest cost   0.3 0.3 0.3
Service cost/(credit)   0.0 0.0 0.1
Benefits paid   (0.5) (0.4)  
Actuarial losses/(gains)   (0.6) 0.5  
Exchange effect   1.2 (0.5)  
Closing balance   9.4 9.0 9.1
Pension Benefit Obligation [Member] | United Kingdom Plan [Member]        
Change in PBO:        
Opening balance   0.1 424.1  
Interest cost   0.0 18.6  
Service cost/(credit)   1.5 (4.9)  
Benefits paid   0.0 (32.9)  
Plan amendments   0.0 8.4  
Scheme closure expenses   (1.6) 0.0  
Actuarial losses/(gains)   0.0 3.7  
Settlements   0.0 (419.2)  
Exchange effect   0.0 2.3  
Closing balance   $ 0.0 $ 0.1 $ 424.1