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Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accounting Policies [Abstract] |  |
Inventory, Finished Goods, Gross | $ 171.9 | $ 148.0
Other Inventory, Supplies, Gross | 111.7 | 100.1
Inventories, net | 324.0 | 277.7
Raw Materials |  |
Accounting Policies [Abstract] |  |
Inventory, Raw Materials, Gross | 23.6 | 13.7
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | 23.6 | 13.7
Inventory Pulp [Member] |  |
Accounting Policies [Abstract] |  |
Inventory, Raw Materials, Gross | 16.8 | 15.9
Inventory [Line Items] |  |
Inventory, Raw Materials, Gross | $ 16.8 | $ 15.9

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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