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v3.20.4

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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