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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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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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
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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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