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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Packaging
Segment Reporting Information [Line Items]
Restructuring charges	$ 0.1	$ 0.2	$ 13.5	$ 0.2
Jackson, Alabama Mill | Corrugated Products Facilities
Segment Reporting Information [Line Items]
Adjustment of asset retirement obligation	$ 2.6	$ 3.9	$ 8.2	$ 9.4

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Adjustment Of Asset Retirement Obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
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-URI https://asc.fasb.org//1943274/2147482047/420-10-45-3

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