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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	May 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Goodwill impairment charge		$ 0.0	$ 55.2	$ 0.0	$ 55.2
Paper Reporting Unit
Segment Reporting Information [Line Items]
Goodwill impairment charge	$ 55.2		55.2		55.2
Jackson, Alabama Mill | Paper
Segment Reporting Information [Line Items]
Restructuring charges		3.8		4.9
San Lorenzo, California [Member] | Packaging and Paper
Segment Reporting Information [Line Items]
Restructuring charges			20.4		20.8
San Lorenzo, California [Member] | Corrugated Products Facilities
Segment Reporting Information [Line Items]
Adjustment of asset retirement obligation		$ 4.7		$ 2.6
COVID-19 | Packaging and Paper
Segment Reporting Information [Line Items]
Incremental out-of-pocket costs			$ 6.1		$ 6.9

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