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Restructuring - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges provided for during the period	$ 21.3	$ 0.0	$ 7.1
Environment remediation and monitoring costs	7.5	0.0	0.0
Impairment of tangible assets	2.0	$ 0.0	$ 0.0
Environmental Monitoring Expense	2.0
Octane Additives [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of tangible assets	2.0
Octane Additives [Member] | Operating Segments [Member] | Tetra Ethyl Lead [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges provided for during the period	21.3
Environment remediation and monitoring costs	7.5
Expected loss on contracts	7.2
Impairment of tangible assets	2.0
Restructuring costs due to downsizing of operations	$ 2.6

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