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Pension Plans - Movements in PBO and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in PBO:      
Actuarial losses/(gains) $ 3.7 $ 3.2 $ 54.7
United Kingdom Plan [Member]      
Change in PBO:      
Benefits paid (39.7) (42.9)  
Fair value of plan assets:      
Opening balance 795.2 862.3  
Benefits paid (39.7) (42.9)  
Actual contributions by employer 1.1 9.0  
Actual return on assets 142.2 11.5  
Exchange effect (140.6) (44.7)  
Closing balance 758.2 795.2 862.3
German Plan [Member]      
Change in PBO:      
Opening balance 9.2 10.4  
Interest cost 0.2 0.2 0.3
Service cost 0.2 0.2 0.2
Benefits paid (0.2) (0.2)  
Actuarial losses/(gains) 1.0 (0.3)  
Exchange effect (0.3) (1.1)  
Closing balance 10.1 9.2 10.4
Fair value of plan assets:      
Benefits paid (0.2) (0.2)  
Pension Benefit Obligation [Member] | United Kingdom Plan [Member]      
Change in PBO:      
Opening balance 739.7 817.1  
Interest cost 20.7 27.7  
Service cost 1.0 1.5  
Benefits paid (39.7) (42.9)  
Actuarial losses/(gains) 119.8 (21.8)  
Exchange effect (131.3) (41.9)  
Closing balance 710.2 739.7 $ 817.1
Fair value of plan assets:      
Benefits paid $ (39.7) $ (42.9)