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Pension and Post Employment Benefits - Plan Net Pension Credit (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Germany [Member]        
Plan net pension credit/(charge):        
Interest cost on projected benefit obligation $ (0.1) $ (0.1) $ (0.2) $ (0.2)
Amortization of actuarial net losses (0.1) (0.1) (0.3) (0.3)
Net pension credit total (0.2) (0.2) (0.5) (0.5)
United Kingdom [Member]        
Plan net pension credit/(charge):        
Interest cost on projected benefit obligation (3.7) (3.9) (11.4) (11.3)
Expected return on plan assets 5.5 6.2 16.9 18.2
Amortization of prior service credit 0.2 0.3 0.8 0.8
Amortization of actuarial net losses (0.5) (1.2) (1.5) (3.7)
Net pension credit total $ 1.5 $ 1.4 $ 4.8 $ 4.0