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Pension and Post Employment Benefits - Plan Net Pension Credit (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
United Kingdom [Member]        
Plan net pension credit/(charge):        
Interest cost on projected benefit obligation $ (3.8) $ (3.7) $ (7.7) $ (7.4)
Expected return on plan assets 5.7 6.1 11.4 12.0
Amortization of prior service credit 0.3 0.2 0.6 0.5
Amortization of actuarial net losses (0.5) (1.3) (1.0) (2.5)
Net pension credit total 1.7 1.3 3.3 2.6
Germany [Member]        
Plan net pension credit/(charge):        
Interest cost on projected benefit obligation 0.0 0.0 (0.1) (0.1)
Amortization of actuarial net losses (0.1) (0.1) (0.2) (0.2)
Net pension credit total $ (0.1) $ (0.1) $ (0.3) $ (0.3)