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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net Sales	$ 586.4		$ 524.6		$ 1,082.6	$ 1,050.0
Income (loss) from operations	(19.5)		47.3		10.9	87.1
Other operating charges, net	(17.0)	$ (7.9)	0.4	$ (1.1)	(25.0)	(0.6)
Assets	2,478.4				2,478.4		$ 1,671.8
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	0.0		(1.3)		(1.4)	(3.0)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income (loss) from operations	(17.7)		(20.1)		(36.2)	(40.6)
Paperboard [Domain]
Segment Reporting Information [Line Items]
Net Sales	331.5		263.0		502.8	498.8
Retail tissue [Domain]
Segment Reporting Information [Line Items]
Net Sales	252.0		252.8		571.9	536.4
Pulp [Domain]
Segment Reporting Information [Line Items]
Net Sales	0.2		7.0		2.5	10.3
Other [Domain]
Segment Reporting Information [Line Items]
Net Sales	2.8		3.1		6.8	7.5
Pulp And Paperboard [Member]
Segment Reporting Information [Line Items]
Assets	1,483.4				1,483.4		665.8
Pulp And Paperboard [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	333.6		272.3		578.1	551.0
Income (loss) from operations	(12.2)		42.0		13.1	99.1
Consumer Products
Segment Reporting Information [Line Items]
Assets	894.1				894.1		917.2
Consumer Products | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	252.8		253.6		505.9	502.0
Income (loss) from operations	27.4		$ 25.0		59.0	$ 29.2
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Assets	$ 100.9				$ 100.9		$ 88.8

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