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Pension Plans - Plan Net Pension Credit (Detail) - United Kingdom Plan [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]        
Service cost   $ 1.5 $ 1.7 $ 1.6
Interest cost on PBO   27.7 34.7 31.3
Expected return on plan assets   (33.4) (37.2) (35.5)
Amortization of prior service credit   (1.2) (1.3) (1.3)
Amortization of actuarial net losses   5.2 5.4 6.2
Net pension credit total   $ (0.2) $ 3.3 $ 2.3
Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1.0      
Interest cost on PBO 22.4      
Expected return on plan assets (32.3)      
Amortization of prior service credit (1.2)      
Amortization of actuarial net losses 2.8      
Net pension credit total $ (7.3)