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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net Sales	$ 538.8	$ 450.5	$ 1,553.3	$ 1,282.8
Income from operations	48.9	13.8	113.3	(15.6)
Other operating charges, net	(2.2)	(10.2)	(8.5)	(55.1)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(3.0)	(1.2)	(5.6)	(5.0)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(17.8)	(14.3)	(53.8)	(44.8)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	292.7	224.1	834.6	648.8
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	237.1	208.3	682.3	572.9
Non-retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	0.0	1.9	0.0	16.3
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	4.6	8.4	18.5	23.9
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	7.3	8.9	23.5	26.1
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	300.8	237.5	862.8	684.6
Income from operations	63.7	34.6	165.9	72.6
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	241.0	214.2	696.1	603.2
Income from operations	$ 5.2	$ 3.7	$ 9.6	$ 11.5

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