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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net Sales	$ 519.9			$ 538.8			$ 1,569.9	$ 1,553.3
Income from operations	54.4			48.9			141.5	113.3
Other operating charges, net	(1.8)	$ 0.4	$ (1.1)	(2.2)	$ (5.7)	$ (0.5)	(2.4)	(8.5)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(0.8)			(3.0)			(3.8)	(5.6)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations	(18.0)			(17.8)			(58.5)	(53.8)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	253.8			292.7			756.5	682.3
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	257.7			237.1			789.7	834.6
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	5.3			4.6			15.5	18.5
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	4.0			7.3			12.1	23.5
Pulp And Paperboard [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	261.4			300.8			812.4	862.8
Income from operations	42.7			63.7			141.8	165.9
Consumer Products | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	259.3			241.0			761.3	696.1
Income from operations	$ 31.4			$ 5.2			$ 60.6	$ 9.6

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The net result for the period of deducting operating expenses from operating revenues.

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