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Restructuring - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges provided for during the period | $ 21.1 | $ 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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