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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
United Kingdom [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | $ (3.9) | $ (3.8) | $ (7.8) | $ (7.7)
Expected return on plan assets | 5.5 | 5.7 | 11.1 | 11.4
Amortization of prior service credit | 0.3 | 0.3 | 0.5 | 0.6
Amortization of actuarial net losses | 0.0 | (0.5) | 0.0 | (1.0)
Net pension credit total | 1.9 | 1.7 | 3.8 | 3.3
Germany [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | (0.0) | (0.0) | (0.1) | (0.1)
Amortization of actuarial net losses | 0.0 | (0.1) | (0.1) | (0.2)
Net pension credit total | $ (0.0) | $ (0.1) | $ (0.2) | $ (0.3)

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