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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation $ (3.9) $ (3.8) $ (7.8) $ (7.7)
Expected return on plan assets 5.5 5.7 11.1 11.4
Amortization of prior service credit 0.3 0.3 0.5 0.6
Amortization of actuarial net losses 0.0 (0.5) 0.0 (1.0)
Net pension credit total 1.9 1.7 3.8 3.3
Germany [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation (0.0) (0.0) (0.1) (0.1)
Amortization of actuarial net losses 0.0 (0.1) (0.1) (0.2)
Net pension credit total $ (0.0) $ (0.1) $ (0.2) $ (0.3)