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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, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Interest cost on PBO	$ 7.5
Expected return on plan assets	(15.4)
Amortization of prior service credit	0.3
Amortization of actuarial net losses	1.6
Net pension credit total	$ (6.0)

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