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Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Reorganization Items	$ 0.1	$ 1.5	$ 4.0		$ 1.6	$ 4.0
Other Cost and Expense, Operating	5.7	0.5	44.5	$ 0.4	6.3	44.9
Operating Expense
Asset Impairment Charges	4.6		0.0		4.6	0.0
Operating Expense | Mill Closure Costs
Other Expenses	0.0	0.4	41.7		0.4	41.7
Asset Impairment Charges			36.9
Operating Expense | Employee Severance
Other Expenses			4.9
Director [Member]
Share based compensation expense	$ 1.1	$ (1.4)	$ (1.1)	$ 0.4	$ (0.3)	$ (0.8)

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

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