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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net Sales	$ 406.4		$ 480.6		$ 832.3	$ 958.5
Income from operations	(56.6)		48.2		(29.5)	67.0
Other operating charges, net	(44.5)	$ (0.4)	(3.0)	$ (8.6)	(44.9)	(11.6)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.7)		(7.2)		(3.9)	(15.0)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(15.0)		(17.6)		(30.5)	(31.0)
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	180.7		271.3		389.0	533.8
Income from operations	(10.0)		36.8		7.9	51.4
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	227.4		216.5		447.2	439.6
Income from operations	13.0		32.0		38.0	58.2
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	169.4		260.4		364.6	508.4
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	212.2		203.6		424.6	414.3
Non-retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	11.2		10.2		24.5	24.1
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	12.0		11.1		15.4	22.0
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	$ 3.2		$ 2.5		$ 7.1	$ 4.6

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