Other Operating Charges, net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Operating Income (Expense), Net	$ (0.3)	$ 15.3	$ 5.3	$ 1.7	$ (0.1)	$ (0.4)	$ 20.3	$ 1.1
Amortization of Debt Issuance Costs	(0.6)			(0.1)			(2.0)	(0.9)
Pulp And Paperboard [Member]
Amortization of Debt Issuance Costs							(1.2)	(0.4)
Operating Expense
Asset Impairment Charges	0.4	0.7		0.0			1.1	0.1
Other General Expense				0.7
Other Operating Income	0.0						0.0	0.4
Business Combination, Integration Related Costs	2.3	2.5	0.8	0.0			5.7	0.0
Business Combination, Acquisition Related Costs	0.5	10.1	3.3	0.0			13.9	0.0
Director [Member]
Share based compensation expense	$ (3.5)	$ 2.0	$ 1.2	$ 1.0	$ (0.2)	$ (0.2)	$ (0.4)	$ 0.6

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

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Amount of amortization expense attributable to debt issuance costs.

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