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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill impairment charge |  | $ 0.0 | $ 55.2 | $ 0.0 | $ 55.2
Paper Reporting Unit |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill impairment charge | $ 55.2 |  | 55.2 |  | 55.2
Jackson, Alabama Mill | Paper |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  | 3.8 |  | 4.9 |
San Lorenzo, California [Member] | Packaging and Paper |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | 20.4 |  | 20.8
San Lorenzo, California [Member] | Corrugated Products Facilities |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjustment of asset retirement obligation |  | $ 4.7 |  | $ 2.6 |
COVID-19 | Packaging and Paper |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Incremental out-of-pocket costs |  |  | $ 6.1 |  | $ 6.9

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