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Quarterly Results of Operations (Unaudited) - Summary of Quarterly Financial Data (Parenthetical) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2020 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  | $ 0 |  |  |  |  |  | $ 0 | $ 55,200,000 | $ 0
Debt Refinancing [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 38,700,000
Treasury Lock [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax benefit from stranded tax effects in accumulated OCI related to write-off of remaining treasury lock |  |  |  | $ 3,200,000 |  |  |  |  |  |
DeRidder Louisiana Mill [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 10,000,000.0 |  |  |  |
Paper Reporting Unit |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 55,200,000 |  |  |  |  |  | $ 55,200,000 |  |  |
Packaging And Paper [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 27,300,000 |  |  |  |
Paper [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 800,000 |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  | $ 55,200,000 |
Paper [Member] | Wallula Washington Mill [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 200,000 |  |  |  |  |
Paper [Member] | Jackson Alabama Mill [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  | $ 9,300,000 |  |  |  |  |  |  |
Packaging [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | 300,000
Packaging [Member] | Wallula Washington Mill [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | $ 800,000
Covid Nineteen [Member] | Paper [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental out-of-pocket costs |  |  |  |  |  |  |  | $ 600,000 |  |
Covid Nineteen [Member] | Packaging [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 6,300,000 |  |  |  |

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