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Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Gain (Loss) on Disposition of Assets	$ 0.0			$ 0.0		$ (1.4)	$ 0.0	$ (1.4)
Other operating charges, net	10.2	$ 44.5	$ 0.4	0.3	$ 3.0	8.6	55.1	11.9
Asset Impairment Charges							36.9
Director [Member]
Share based compensation expense	1.4			0.3			0.6	2.5
Reorganization Expenses [Member]
Other Cost and Expense, Operating	3.4			0.0	0.6	2.8	7.3	3.4
Union settlement [Member]
Other Cost and Expense, Operating	0.0			0.0		6.6	0.0	6.6
Union settlement [Member] | Consumer Products
Other Cost and Expense, Operating						2.6
Union settlement [Member] | Pulp And Paperboard [Member]
Other Cost and Expense, Operating						4.0
Other Expense [Member]
Other Cost and Expense, Operating	0.0			0.0			0.0	0.8
Other Operating Income (Expense)
Asset Impairment Charges		36.9
Severance Costs		4.9
Reorganization Items	3.4	4.0
Other Operating Income (Expense) | Director [Member]
Share based compensation expense	1.4	(1.1)	$ 0.4	0.3	$ 1.9	$ 0.2
Closure and impairment costs - Neenah
Other Cost and Expense, Operating	$ 5.4	$ 41.7		$ 0.0			$ 47.1	$ 0.0

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