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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net Sales	$ 526.4	$ 406.4	$ 1,014.6	$ 832.3
Income from operations	31.5	(56.6)	64.4	(29.5)
Other operating charges, net	(5.7)	(44.5)	(6.3)	(44.9)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(1.5)	(1.7)	(2.6)	(3.9)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(18.2)	(15.0)	(36.0)	(30.5)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	287.6	212.2	541.9	424.6
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	228.6	169.4	445.2	364.6
Non-retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	0.0	7.8	0.0	14.4
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	5.6	12.0	14.0	15.4
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	6.1	6.6	16.2	17.2
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Net Sales	295.8	227.4	562.0	447.2
Income from operations	52.0	13.0	102.3	38.0
Consumer Products
Segment Reporting Information [Line Items]
Net Sales	232.1	180.7	455.2	389.0
Income from operations	$ 3.5	$ (10.0)	$ 4.4	$ 7.9

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