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Pension and Post-Employment Benefits - Defined Benefit Pension Plan (Detail) - United Kingdom Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Plan assumptions at December 31, (%):
Discount rate	2.78%	2.56%	2.48%
Inflation rate	2.25%	2.20%	2.25%
Rate of return on plan assets - overall on bid-value	3.05%	2.75%	3.20%
Plan asset allocation by category (%):
Total plan asset allocation by category	100.00%	100.00%	100.00%
Equity Securities [Member]
Plan asset allocation by category (%):
Total plan asset allocation by category	12.00%	38.00%	25.00%
Debt Security [Member]
Plan asset allocation by category (%):
Total plan asset allocation by category	83.00%	53.00%	66.00%
Cash [Member]
Plan asset allocation by category (%):
Total plan asset allocation by category	5.00%	9.00%	9.00%
United Kingdom [Member]
Plan net pension (credit)/charge:
Interest cost on PBO	$ 15.0	$ 15.2	$ 20.8
Expected return on plan assets	(22.2)	(24.5)	(29.9)
Amortization of prior service credit	(1.1)	(1.0)	(1.1)
Amortization of actuarial net losses	2.0	5.0	2.6
Plan net pension (credit)/charge	$ (6.3)	$ (5.3)	$ (7.6)

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Defined benefit plan assumptions used calculating net periodic benefit cost inflation rate.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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