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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |
Increase to the provisions for legacy operations | $ 2.3 |
Remediation [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Accretion expense recognized | $ 5.0 | $ 2.6

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