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Goodwill and Intangible Assets - Details (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Goodwill | $ 35.1 |  |
Net proceeds from divested assets |  |  | $ 70.9
Goodwill, Impairment Loss | 0.0 | $ 0.0 | (195.1)
Goodwill and intangible assets, net | 48.8 | 52.0 | 59.2
Amortization of Intangible Assets | (3.2) | (7.2) |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 50.1 | 46.9 | 39.7
Minimum [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Maximum [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Consumer Products [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | (14.0)
Intangible Assets, Net (Excluding Goodwill) | $ 0.0 | 0.3 | 4.6
Amortization of Intangible Assets | (0.3) | (4.3) |
Pulp And Paperboard [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 35.1 | 35.1 | 35.1
Intangible Assets, Net (Excluding Goodwill) | 13.7 | 16.6 | $ 19.5
Amortization of Intangible Assets | (2.9) | (2.9) |
Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Intangible Assets, Net (Excluding Goodwill) | 12.8 | 15.0 |
Trademarks and Trade Names [Member] |  |  |
Goodwill [Line Items] |  |  |
Intangible Assets, Net (Excluding Goodwill) | 0.7 | 1.7 |
Other Intangible Assets [Member] |  |  |
Goodwill [Line Items] |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 0.2 | $ 0.2 |

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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