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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net Sales	$ 450.5			$ 457.4			$ 1,282.8	$ 1,415.9
Income from operations	13.8			49.2			(15.6)	116.2
Other operating charges, net	(10.2)	$ (44.5)	$ (0.4)	(0.3)	$ (3.0)	$ (8.6)	(55.1)	(11.9)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.2)			(5.6)			(5.0)	(20.6)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(14.3)			(14.6)			(44.8)	(45.6)
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	214.2			245.9			603.2	779.7
Income from operations	3.7			31.5			11.5	82.9
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	237.5			217.2			684.6	656.8
Income from operations	34.6			32.6			72.6	90.8
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	208.3			238.6			572.9	747.0
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	224.1			207.4			648.8	621.7
Non-retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	5.7			6.9			30.1	31.0
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	8.4			8.1			23.9	30.1
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	$ 5.1			$ 2.1			$ 12.2	$ 6.7

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