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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Net Sales	$ 524.6		$ 526.4		$ 1,050.0	$ 1,014.6
Income from operations	47.3		31.5		87.1	64.4
Other operating charges, net	0.4	$ (1.1)	(5.7)	$ (0.5)	(0.6)	(6.3)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.3)		(1.5)		(3.0)	(2.6)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(20.1)		(18.2)		(40.6)	(36.0)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	263.0		287.6		498.8	445.2
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	252.8		228.6		536.4	541.9
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	7.0		5.6		10.3	14.0
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	3.1		6.1		7.5	16.2
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	272.3		295.8		551.0	562.0
Income from operations	42.0		52.0		99.1	102.3
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	253.6		232.1		502.0	455.2
Income from operations	$ 25.0		$ 3.5		$ 29.2	$ 4.4

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