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Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Reorganization Items	$ 0.0		$ 1.5	$ 3.4	$ 4.0		$ 1.6	$ 7.3
Other Cost and Expense, Operating	2.2	$ 5.7	0.5	10.2	44.5	$ 0.4	8.5	55.1
Operating Expense
Asset Impairment Charges	1.2	4.6		0.0			5.8	0.0
Operating Expense | Mill Closure Costs
Other Expenses	0.0		0.4	5.4	41.7		0.4	47.1
Asset Impairment Charges					36.9
Operating Expense | Employee Severance
Other Expenses				5.4	4.9
Director [Member]
Share based compensation expense	$ 1.0	$ 1.1	$ (1.4)	$ 1.4	$ (1.1)	$ 0.4	$ 0.7	$ 0.6

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

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