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Pension Plans - Plan Net Pension Charge (Detail) (United Kingdom Plan [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1.6 $ 1.6 $ 1.6
Interest cost on PBO 31.3 32.2 36.6
Expected return on plan assets (35.5) (34.1) (36.7)
Amortization of prior service credit (1.3) (1.3) (1.3)
Net pension charge 2.3 1.6 2.9
Forecast [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1.7    
Interest cost on PBO 34.7    
Expected return on plan assets (37.3)    
Amortization of prior service credit (1.3)    
Amortization of actuarial net losses 5.5    
Net pension charge $ 3.3