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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net Sales	$ 496.2	$ 525.4
Income from operations	30.4	39.8
Other operating charges, net	(7.9)	(1.1)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.4)	(1.7)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(18.5)	(20.4)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	240.4	272.9
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	250.8	246.0
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	2.3	3.2
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	4.1	5.0
Pulp And Paperboard [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	244.5	278.8
Income from operations	25.3	57.1
Consumer Products | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	253.1	248.3
Income from operations	$ 31.5	$ 4.2

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