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Pension Plans - Movement in PBO and Fair Value of Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in PBO:      
Actuarial losses/(gains) $ (6.7) $ (58.5) $ 19.5
United Kingdom Plan [Member]
      
Change in PBO:      
Service cost 1.6 1.6 1.6
Interest cost 31.3 32.2 36.6
Amortization of prior service cost/(credit) 1.3 1.3 1.3
Benefits paid (39.4) (43.9)  
Fair value of plan assets:      
Opening balance 768.6 708.8  
Benefits paid (39.4) (43.9)  
Actual contributions by employer 10.8 9.2  
Actual return on assets 35.5 61.2  
Exchange effect 14.8 33.3  
Closing balance 790.3 768.6 708.8
United Kingdom Plan [Member] | Pension Benefit Obligation [Member]
      
Change in PBO:      
Opening balance 805.3 687.4  
Service cost 1.6 1.6  
Interest cost 31.3 32.2  
Benefits paid (39.4) (43.9)  
Actuarial losses/(gains) 5.9 94.4  
Exchange effect 15.1 33.6  
Closing balance 819.8 805.3  
Fair value of plan assets:      
Benefits paid (39.4) (43.9)  
German Plan [Member]
      
Change in PBO:      
Opening balance 9.3 6.3  
Service cost 0.2 0.1 0.2
Interest cost 0.3 0.3 0.3
Amortization of prior service cost/(credit) (0.1) 0 0
Benefits paid (0.2) (0.2)  
Actuarial losses/(gains) (0.4) 2.6  
Exchange effect 0.5 0.2  
Closing balance 9.6 9.3 6.3
Fair value of plan assets:      
Benefits paid $ (0.2) $ (0.2)