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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 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 | $ 0.6 |  | $ 8.8
High-performance of virgin kraft linerboard machine percentage | 100.00% |  | 100.00%
Packaging And Corporate And Other | Corrugated Products Facility and Corporate Administration Facility Closure |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges |  |  | $ 0.3

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