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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	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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- Definition

Increase to the provisions for legacy operations.

+ References

No definition available.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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