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Inventories - Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Inventory Disclosure [Abstract] |  |
Paperboard and tissue products | $ 154.9 | $ 148.0
Materials and supplies | 105.6 | 100.1
Inventories | 287.7 | 277.7
Inventory [Line Items] |  |
Paperboard and tissue products | 154.9 | 148.0
Materials and supplies | 105.6 | 100.1
Inventories | 287.7 | 277.7
Raw Materials |  |
Inventory Disclosure [Abstract] |  |
Inventory, Raw Materials, Gross | 13.0 | 13.7
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | 13.0 | 13.7
Inventory Pulp |  |
Inventory Disclosure [Abstract] |  |
Inventory, Raw Materials, Gross | 14.2 | 15.9
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | $ 14.2 | $ 15.9

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