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Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Operating Income (Expense), Net	$ (0.4)	$ 1.1	$ 5.7	$ 0.5	$ 0.6	$ 6.3
Operating Expense
Reorganization Items	0.0		0.1	1.5	0.0	1.6
Asset Impairment Charges	0.0	1.1	4.6		1.1	4.6
Operating Expense | Mill Closure Costs
Other Expenses	0.0		0.0	0.4	0.0	0.4
Other Income
Other Operating Income	(0.3)		0.0		(0.1)	0.0
Director [Member]
Share based compensation expense	$ (0.2)	$ (0.2)	$ 1.1	$ (1.4)	$ (0.4)	$ (0.3)

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

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