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Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accounting Policies [Abstract] |  |
Inventory, Finished Goods, Gross | $ 123.4 | $ 77.4
Other Inventory, Supplies, Gross | 102.5 | 57.0
Inventories, net | 258.0 | 161.2
Raw Materials |  |
Accounting Policies [Abstract] |  |
Inventory, Raw Materials, Gross | 25.1 | 22.1
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | 25.1 | 22.1
Inventory Pulp [Member] |  |
Accounting Policies [Abstract] |  |
Inventory, Raw Materials, Gross | 6.9 | 4.7
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | $ 6.9 | $ 4.7

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