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Inventories - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Paperboard and tissue products	$ 175.2	$ 148.0
Materials and supplies	110.4	100.1
Inventories	326.8	277.7
Inventory [Line Items]
Paperboard and tissue products	175.2	148.0
Materials and supplies	110.4	100.1
Inventories	326.8	277.7
Raw Materials
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	18.2	13.7
Inventory [Line Items]
Inventory, Raw Materials, Gross	18.2	13.7
Inventory Pulp
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	23.1	15.9
Inventory [Line Items]
Inventory, Raw Materials, Gross	$ 23.1	$ 15.9

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