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Pension and Post-Employment Benefits - Movements in PBO and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in PBO:      
Actuarial gains $ (7.7) $ 9.5 $ (15.7)
Fair value of plan assets:      
Opening balance 115.9    
Closing balance 118.0 115.9  
United Kingdom Plan [Member]      
Change in PBO:      
Benefits paid (45.5) (42.1)  
Fair value of plan assets:      
Opening balance 816.9 739.1  
Benefits paid (45.5) (42.1)  
Actual contributions by employer 0.0 0.4  
Actual return on assets 77.6 89.1  
Exchange effect 27.7 30.4  
Closing balance 876.7 816.9 739.1
German Plan [Member]      
Change in PBO:      
Opening balance 13.3 11.3  
Interest cost 0.1 0.2 0.2
Service cost 0.1 0.1  
Benefits paid (0.3) (0.3)  
Actuarial gains 0.8 2.2  
Exchange effect 1.2 (0.2)  
Closing balance 15.2 13.3 11.3
Fair value of plan assets:      
Benefits paid (0.3) (0.3)  
Pension Benefit Obligation [Member] | United Kingdom Plan [Member]      
Change in PBO:      
Opening balance 701.0 643.2  
Interest cost 11.2 15.2  
Service cost 1.2 0.9  
Benefits paid (45.5) (42.1)  
Actuarial gains 61.1 57.7  
Plan amendments 5.5 0.0  
Exchange effect 24.2 26.1  
Closing balance 758.7 701.0 $ 643.2
Fair value of plan assets:      
Benefits paid $ (45.5) $ (42.1)