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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Expenditure	$ 4.1	$ 4.4	$ 3.1
Operating Segments [Member] | Tetra Ethyl Lead [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Additional provision restructuring charges plant closure	7.5
Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Accretion expense recognized	3.7
Remediation charge for changes in the scope and cost of future remediation activities	1.4
Expenditure	$ 4.1	$ 4.4	$ 3.1

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Remediation charges.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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