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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Wallula, Washington Mill |  |  |
Segment Reporting Information [Line Items] |  |  |
High-performance of virgin kraft linerboard machine percentage | 100.00% |  |
Paper | Wallula, Washington Mill |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges | $ 13.6 | $ 0.6 | $ 22.4
High-performance of virgin kraft linerboard machine percentage | 100.00% | 100.00% |
Packaging And Corporate And Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges | $ 0.2 |  | $ 0.5

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