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Pension and Post-Employment Benefits - Plan Net Pension Credit (Detail) - GERMANY - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ (0.5) $ (0.3) $ (1.4) $ (1.0)
Interest cost on projected benefit obligation (1.9) (2.9) (5.7) (8.5)
Expected return on plan assets 3.9 4.5 11.7 13.3
Amortization of prior service credit/(cost) (0.1) 0.2 (0.2) 0.6
Amortization of actuarial net losses (0.6) (0.4) (1.9) (1.2)
Net pension credit total $ 0.8 $ 1.1 $ 2.5 $ 3.2