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Inventories - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Inventories	$ 283.2	$ 258.0
Inventory [Line Items]
Inventory, Finished Goods, Net of Reserves	136.9	123.4
Inventory, Supplies, Net of Reserves	110.4	102.5
Inventories	283.2	258.0
Inventories
Inventory [Line Items]
Inventory, Raw Materials, Net of Reserves	27.5	25.1
Inventory Pulp
Inventory [Line Items]
Inventory, Raw Materials, Net of Reserves	$ 8.4	$ 6.9

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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