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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Restructuring Cost and Reserve [Line Items] |  |  |
Expenditure | $ 5.8 | $ 3.8 | $ 4.9
Remediation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accretion expense recognized | 3.6 |  |
Remediation charge for changes in the scope and cost of future remediation activities | $ 2.0 |  |

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