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Pension and Post-Employment Benefits - Plan Net Pension Credit (Detail) - United Kingdom Plan [Member] - Nonoperating Income (Expense) [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Interest cost on PBO	$ 11.5
Expected return on plan assets	(18.3)
Amortization of prior service credit	(0.9)
Amortization of actuarial net losses	0.9
Net pension credit total	$ (6.8)

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