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Restructuring - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges provided for during the period	$ 0.0	$ 0.0	$ 21.1	$ 0.0
Impairment of tangible assets			2.0	$ 0.0
Environmental Monitoring Expense			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			21.1
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			$ 2.4

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