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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Net Sales	$ 525.4	$ 488.2
Income from operations	39.8	32.9
Other operating charges, net	(1.1)	(0.5)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.7)	(1.1)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(20.4)	(17.8)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	272.9	254.3
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	246.0	216.6
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	3.2	8.3
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	5.0	10.1
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	278.8	266.2
Income from operations	57.1	50.3
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	248.3	223.0
Income from operations	$ 4.2	$ 0.9

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