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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
United Kingdom Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation $ (1.9) $ (2.7) $ (3.8) $ (5.5)
Expected return on plan assets 3.9 4.3 7.8 8.8
Amortization of prior service (cost)/credit (0.0) 0.2 (0.1) 0.4
Amortization of actuarial net losses (0.4) (0.2) (0.8) (0.4)
Net pension credit total 1.6 1.6 3.1 3.3
Germany [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation (0.0) (0.0) (0.0) (0.1)
Amortization of actuarial net losses (0.2) (0.3) (0.5) (0.4)
Net pension credit total $ (0.2) $ (0.3) $ (0.5) $ (0.5)