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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Remediation charge for changes in the scope and cost of future remediation activities	$ 7.1	$ 0.0	$ 0.0
Expenditure	3.1	2.4	2.7
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	4.0
Remediation charge for changes in the scope and cost of future remediation activities	2.8
Expenditure	$ 3.1	$ 2.4	$ 2.7

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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.

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