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Inventories - Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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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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