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Pension and Post-Employment Benefits - Plan Net Pension Credit (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
United Kingdom Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost on projected benefit obligation $ (1.9) $ (2.8)
Expected return on plan assets 3.9 4.5
Amortization of prior service (cost)/credit (0.1) 0.2
Amortization of actuarial net losses (0.4) (0.2)
Net pension credit total 1.5 1.7
Germany [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost on projected benefit obligation (0.0) (0.0)
Amortization of actuarial net losses (0.3) (0.2)
Net pension credit total $ (0.3) $ (0.2)