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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Accretion expense recognized	$ 1.9	$ 9.8
Other Restructuring [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Additional provision restructuring charges plant closure			$ 7.5

X

- 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

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

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