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Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounting Policies [Abstract] |  |
Inventory, Finished Goods, Gross | $ 156.8 | $ 171.9
Other Inventory, Supplies, Gross | 124.1 | 111.7
Inventories, net | 319.8 | 324.0
Raw Materials |  |
Accounting Policies [Abstract] |  |
Inventory, Raw Materials, Gross | 22.1 | 23.6
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | 22.1 | 23.6
Inventory Pulp [Member] |  |
Accounting Policies [Abstract] |  |
Inventory, Raw Materials, Gross | 16.8 | 16.8
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | $ 16.8 | $ 16.8

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