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Segment Information - Analysis of Operations by Reportable Segment (Parenthetical) (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
		Oct. 31, 2021	Dec. 31, 2022	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Goodwill impairment charge			$ 0				$ 0	$ 0	$ 55,200,000
Charges for disposal of fixed assets							(15,200,000)	(6,100,000)	(6,800,000)
Acquisition and integration related costs	[1]						0	600,000	0
Gain on Sale of Transportation Assets							800,000
Business Combination Acquisition And Integration Related Costs	[1]						0	600,000	$ 0
Debt Refinancing Cost		$ 58,900,000
Advance Packaging Corporation [Member]
Segment Reporting Information [Line Items]
Restructuring charges				$ 400,000
Acquisition and integration related costs							1,000,000.0	500,000
Business Combination Acquisition And Integration Related Costs							1,000,000.0	500,000
Packaging
Segment Reporting Information [Line Items]
Acquisition and integration related costs								400,000
Business Combination Acquisition And Integration Related Costs								400,000
Packaging | COVID-19
Segment Reporting Information [Line Items]
Restructuring charges					$ 6,300,000
Corrugated Products Facilities
Segment Reporting Information [Line Items]
Restructuring charges								700,000
Paper
Segment Reporting Information [Line Items]
Restructuring charges							800,000
Paper | COVID-19
Segment Reporting Information [Line Items]
Incremental Out Of Pocket Costs							600,000
Packaging and Paper
Segment Reporting Information [Line Items]
Restructuring charges					27,300,000
Paper Reporting Unit
Segment Reporting Information [Line Items]
Goodwill impairment charge						$ 55,200,000
DeRidder, Louisiana Mill
Segment Reporting Information [Line Items]
Restructuring charges					$ 10,000,000.0
Jackson Alabama Mill [Member] | Corrugated Products Facilities
Segment Reporting Information [Line Items]
Adjustment of asset retirement obligation				4,300,000
Jackson Alabama Mill [Member] | Paper
Segment Reporting Information [Line Items]
Restructuring charges				$ 9,300,000
Adjustment of asset retirement obligation								5,300,000
Jackson Alabama Mill [Member] | Paper Reporting Unit
Segment Reporting Information [Line Items]
Restructuring charges								$ 8,800,000
San Lorenzo, California [Member]
Segment Reporting Information [Line Items]
Restructuring charges							$ 2,800,000
[1] Includes charges related to the December 2021 Advance Packaging Corporation acquisition.

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