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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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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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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))
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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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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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