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Segment Information - Analysis of Operations by Reportable Segment (Parenthetical) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 0 |  |  |  |  | $ 55,200,000 |  |
Charges for disposal of fixed assets |  |  |  |  |  |  |  | (6,800,000) | $ (8,200,000) | $ (5,800,000)
Acquisition and integration related costs | [1] |  |  |  |  |  |  |  |  | 200,000
Debt Refinancing |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 38,700,000 |  | 38,700,000 |
Paper Reporting Unit |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  | $ 55,200,000 |  |  | $ 55,200,000 |  |  |  |  |
Packaging and Paper |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  | $ 4,000,000.0 | $ 3,300,000 | 20,400,000 |  |  | 27,300,000 |  |
Paper |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 800,000 |  |
Goodwill impairment charge |  |  |  |  |  |  |  | 55,200,000 |  |
Packaging |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 300,000 | 1,600,000
Property damage and business interruption insurance |  |  |  |  |  |  |  |  |  | 500,000
Acquisition and integration related costs |  |  |  |  |  |  |  |  |  | 200,000
Corporate and Other |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 200,000
DeRidder, Louisiana Mill |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charges for disposal of fixed assets |  |  |  |  |  |  |  |  | 3,000,000.0 |
DeRidder, Louisiana Mill | Packaging |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charges for disposal of fixed assets |  |  |  |  |  |  |  |  | 3,000,000.0 |
Wallula, Washington Mill | Paper |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 200,000 | 17,700,000
Wallula, Washington Mill | Packaging |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 800,000 | $ 12,300,000
Hurricane Laura | DeRidder, Louisiana Mill |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charges related to the impact of Hurricane Laura |  |  |  | $ 10,000,000.0 |  |  |  | 10,000,000.0 |  |
COVID-19 | Packaging and Paper |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental out-of-pocket costs |  |  |  |  | $ 6,100,000 | $ 800,000 |  | 6,300,000 |  |
COVID-19 | Paper |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental out-of-pocket costs |  |  |  |  |  |  |  | $ 600,000 |  |
[1] | Includes charges for acquisition and integration costs related to recent acquisitions.

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