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Goodwill and Intangible Assets - Details (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 43.6	$ 45.9	$ 48.8
Amortization of Intangible Assets	(2.2)	(2.9)
Finite-Lived Intangible Assets, Accumulated Amortization	26.3	24.1
Intangible Assets, Gross (Excluding Goodwill)	$ 34.9	34.9
Maximum [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Pulp And Paperboard [Member]
Goodwill [Line Items]
Goodwill	$ 35.1	35.1	35.1
Intangible Assets, Net (Excluding Goodwill)	8.6	10.8	$ 13.7
Amortization of Intangible Assets	(2.2)	(2.9)
Customer Relationships [Member]
Goodwill [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 8.6	10.7
Other Intangible Assets [Member]
Goodwill [Line Items]
Intangible Assets, Net (Excluding Goodwill)		$ 0.1

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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