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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
United Kingdom [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | $ (3.6) | $ (3.7) | $ (11.4) | $ (11.4)
Expected return on plan assets | 5.5 | 5.5 | 16.5 | 16.9
Amortization of prior service credit | 0.1 | 0.2 | 0.7 | 0.8
Amortization of actuarial net losses | 0.0 | (0.5) | 0.0 | (1.5)
Net pension credit total | 2.0 | 1.5 | 5.8 | 4.8
Germany [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | (0.1) | (0.1) | (0.2) | (0.2)
Amortization of actuarial net losses | (0.1) | (0.1) | (0.2) | (0.3)
Net pension credit total | $ (0.2) | $ (0.2) | $ (0.4) | $ (0.5)

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