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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Expenditure	$ 4.4	$ 3.1	$ 2.4
European Performance Chemicals Business [Member]
Restructuring Cost and Reserve [Line Items]
Asset retirement obligations			2.8
Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Accretion expense recognized	4.3
Remediation charge for changes in the scope and cost of future remediation activities	0.1
Expenditure	$ 4.4	$ 3.1	$ 2.4

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Asset retirement obligations current and noncurrent.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
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-Publisher FASB
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