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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Plan assumptions at December 31, (%):
Discount rate	1.84%	1.36%	1.95%
Inflation rate	3.55%	2.35%	2.25%
Rate of return on plan assets - overall on bid-value	2.30%	2.00%	2.50%
Plan asset allocation by category (%):
Total plan asset allocation by category	100.00%	100.00%	100.00%
Cash [Member]
Plan asset allocation by category (%):
Total plan asset allocation by category	13.00%	4.00%	4.00%
Defined Benefit Plan Debt Securities And Insurance Contracts [Member]
Plan asset allocation by category (%):
Total plan asset allocation by category	82.00%	86.00%	86.00%
Defined Benefit Plan Equity Securities And Real Estate [Member]
Plan asset allocation by category (%):
Total plan asset allocation by category	5.00%	10.00%	10.00%
United Kingdom [Member]
Plan net pension (credit)/charge:
Service cost	$ 1.6	$ 1.2	$ 0.9
Interest cost on PBO	7.6	11.2	15.2
Expected return on plan assets	(15.5)	(17.8)	(22.0)
Amortization of prior service credit	0.3	(0.5)	(0.9)
Amortization of actuarial net losses	1.6	0.9	0.0
Settlement event	(0.3)	0.0	0.0
Net periodic benefit	$ (4.7)	$ (5.0)	$ (6.8)

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