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Inventories - Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Paperboard and tissue products	$ 187.3	$ 171.9
Materials and supplies	114.1	111.7
Inventories	345.5	324.0
Inventory [Line Items]
Paperboard and tissue products	187.3	171.9
Materials and supplies	114.1	111.7
Inventories	345.5	324.0
Raw Materials
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	21.7	23.6
Inventory [Line Items]
Inventory, Raw Materials, Gross	21.7	23.6
Inventory Pulp
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	22.4	16.8
Inventory [Line Items]
Inventory, Raw Materials, Gross	$ 22.4	$ 16.8

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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