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Pension Plans - Movements in PBO and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in PBO:      
Actuarial losses/(gains) $ 3.2 $ 54.7 $ (6.7)
United Kingdom Plan [Member]      
Change in PBO:      
Interest cost 27.7 34.7 31.3
Service cost 1.5 1.7 1.6
Benefits paid (42.9) (47.6)  
Fair value of plan assets:      
Opening balance 862.3 790.3  
Benefits paid (42.9) (47.6)  
Actual contributions by employer 9.0 11.4  
Actual return on assets 11.5 161.7  
Exchange effect (44.7) (53.5)  
Closing balance 795.2 862.3 790.3
German Plan [Member]      
Change in PBO:      
Opening balance 10.4 9.6  
Interest cost 0.2 0.3 0.3
Service cost 0.2 0.2 0.2
Benefits paid (0.2) (0.2)  
Actuarial losses/(gains) (0.3) 1.8  
Exchange effect (1.1) (1.3)  
Closing balance 9.2 10.4 9.6
Fair value of plan assets:      
Benefits paid (0.2) (0.2)  
Pension Benefit Obligation [Member] | United Kingdom Plan [Member]      
Change in PBO:      
Opening balance 817.1 819.8  
Interest cost 27.7 34.7  
Service cost 1.5 1.7  
Benefits paid (42.9) (47.6)  
Actuarial losses/(gains) (21.8) 59.3  
Exchange effect (41.9) (50.8)  
Closing balance 739.7 817.1 $ 819.8
Fair value of plan assets:      
Benefits paid $ (42.9) $ (47.6)