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Goodwill and Intangible Assets - Details (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |
Intangible Assets, Net (Including Goodwill) | $ 41.5 | $ 43.6 | $ 45.9
Amortization of Intangible Assets | (2.1) | (2.2) |
Finite-Lived Intangible Assets, Accumulated Amortization | 28.4 | 26.3 |
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) | 6.4 | 8.6 | $ 10.8
Amortization of Intangible Assets | (2.1) | (2.2) |
Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 6.4 | $ 8.6 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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