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Restructuring - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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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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