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Other Operating Charges, net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Operating Income (Expense), Net	$ (14.0)	$ (6.3)	$ 17.5
Gain (Loss) on Disposition of Assets	(1.4)	0.0	(24.0)
Reorganization Expenses [Member]
Other Cost and Expense, Operating	3.4	2.9	8.0
Environmental Remediation [Member]
Other Cost and Expense, Operating	2.5	1.0	0.0
Other Expense [Member]
Other Cost and Expense, Operating	0.0	2.1	0.8
Union Settlement
Other Cost and Expense, Operating	6.6	0.0	0.0
Union Settlement | Consumer Products
Other Cost and Expense, Operating	2.6
Union Settlement | Pulp And Paperboard [Member]
Other Cost and Expense, Operating	4.0
Director [Member]
Share-based Payment Arrangement, Expense	$ 2.9	$ 0.3	$ (2.3)

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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