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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Remediation charge for changes in the scope and cost of future remediation activities | $ 7.1 | $ 0.0 | $ 0.0
Expenditure | 3.1 | 2.4 | 2.7
European Performance Chemicals Business [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset retirement obligations |  | 2.8 |
Remediation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accretion expense recognized | 4.0 |  |
Remediation charge for changes in the scope and cost of future remediation activities | 2.8 |  |
Expenditure | $ 3.1 | $ 2.4 | $ 2.7

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