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Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Cost and Expense, Operating	$ 1.1	$ 0.5
Operating Expense
Reorganization Items	0.0	1.5
Asset Impairment Charges	1.1	0.0
Other Expenses	0.2	0.0
Operating Expense | Mill Closure Costs
Other Expenses	0.0	0.4
Director [Member]
Share based compensation expense	$ (0.2)	$ (1.4)

X

- Definition

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

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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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Amount of expense classified as other.

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Total amount of reorganization items.

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