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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in PBO:      
Actuarial gains $ (15.7) $ 39.5 $ 3.7
Fair value of plan assets:      
Opening balance 116.0    
Closing balance 95.9 116.0  
United Kingdom Plan [Member]      
Change in PBO:      
Benefits paid (43.7) (37.8)  
Fair value of plan assets:      
Opening balance 837.4 758.2  
Actual benefits paid (43.7) (37.8)  
Actual contributions by employer 1.1 1.0  
Actual return on assets (10.3) 43.0  
Exchange effect (45.4) 73.0  
Closing balance 739.1 837.4 758.2
German Plan [Member]      
Change in PBO:      
Opening balance 11.8 10.1  
Interest cost 0.2 0.2 0.2
Service cost 0.2 0.2  
Benefits paid (0.3) (0.2)  
Actuarial gains 0.0 0.2  
Exchange effect (0.6) 1.3  
Closing balance 11.3 11.8 10.1
Fair value of plan assets:      
Actual benefits paid (0.3) (0.2)  
Pension Benefit Obligation [Member] | United Kingdom Plan [Member]      
Change in PBO:      
Opening balance 721.4 710.2  
Interest cost 15.0 15.2  
Service cost 1.2 0.9  
Benefits paid (43.7) (37.8)  
Actuarial gains (14.6) (32.7)  
Plan amendments 3.3 0.0  
Exchange effect (39.4) 65.6  
Closing balance 643.2 721.4 $ 710.2
Fair value of plan assets:      
Actual benefits paid $ (43.7) $ (37.8)