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Quarterly Results of Operations (Unaudited) - Summary of Quarterly Financial Data (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 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  | $ 0 |  |  |  |  |  |  | $ 55,200,000 |
Debt Refinancing |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 38,700,000 |  |  |  | $ 38,700,000
Treasury Lock |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges, after tax |  |  |  |  |  | $ 25,900,000 |  |  |  |
Restructuring charges, diluted per share |  |  |  |  |  | $ 0.28 |  |  |  |
Income tax benefit from stranded tax effects in accumulated OCI related to write-off of remaining treasury lock |  |  |  |  |  | $ 3,200,000 |  |  |  |
Wallula, Washington Mill |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges, after tax |  |  |  |  |  | $ 300,000 | $ 2,300,000 | $ 500,000 |  |
Restructuring charges, diluted per share |  |  |  |  |  | $ 0.00 | $ 0.02 | $ 0.01 |  |
Paper Reporting Unit |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 55,200,000 |  |  | $ 55,200,000 |  |  |  |  |  |
Non-cash goodwill impairment charge, after tax |  |  |  | $ 55,200,000 |  |  |  |  |  |
Non-cash goodwill impairment charge, diluted per share |  |  |  | $ 0.58 |  |  |  |  |  |
Packaging and Paper |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 4,000,000.0 | $ 3,300,000 | $ 20,400,000 |  |  |  |  | 27,300,000 |
Restructuring charges, after tax |  | $ 3,000,000.0 | $ 2,500,000 | $ 15,300,000 |  |  |  |  |  |
Restructuring charges, diluted per share |  | $ 0.03 | $ 0.03 | $ 0.16 |  |  |  |  |  |
Packaging And Corporate And Other |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 400,000 | $ 3,000,000.0 | $ 600,000 |  |
Corrugated Products Facility Closure |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 400,000 | 300,000 |  |  |  |
Restructuring charges, after tax |  |  |  |  | $ 300,000 | $ 200,000 |  |  |  |
Restructuring charges, diluted per share |  |  |  |  | $ 0.00 | $ 0.00 |  |  |  |
COVID-19 | Packaging and Paper |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental out-of-pocket costs |  |  |  | $ 6,100,000 | $ 800,000 |  |  |  | 6,300,000 |
Incremental out-of-pocket costs, after tax |  |  |  | $ 4,600,000 | $ 600,000 |  |  |  |  |
Incremental out-of-pocket costs, diluted per share |  |  |  | $ 0.05 | $ 0.01 |  |  |  |  |
Hurricane Laura | DeRidder, Louisiana Mill |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Charges related to the impact of Hurricane Laura |  |  | $ 10,000,000.0 |  |  |  |  |  | $ 10,000,000.0 |
Charges related to the impact of Hurricane Laura, after tax |  |  | $ 7,600,000 |  |  |  |  |  |  |
Charges related to the impact of Hurricane Laura, diluted per share |  |  | $ 0.08 |  |  |  |  |  |  |

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