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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
United Kingdom Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation $ (2.9) $ (3.6) $ (8.4) $ (11.4)
Expected return on plan assets 4.5 5.5 13.3 16.5
Amortization of prior service credit 0.2 0.1 0.6 0.7
Amortization of actuarial net losses (0.2) 0.0 (0.6) 0.0
Net pension credit total 1.6 2.0 4.9 5.8
Germany [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation (0.0) (0.1) (0.1) (0.2)
Amortization of actuarial net losses (0.2) (0.1) (0.6) (0.2)
Net pension credit total $ (0.2) $ (0.2) $ (0.7) $ (0.4)