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Pension and Post-Employment Benefits - Plan Net Pension Credit (Detail) - United Kingdom Plan [Member] - Forecast [Member] - Nonoperating Income (Expense) [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Interest cost on PBO	$ 15.2
Expected return on plan assets	(21.9)
Amortization of prior service credit	(0.9)
Net pension credit total	$ (7.6)

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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