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Segment Information (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Integration-related, facilities closure and other costs | $ 0.5 | $ 2.6 | $ 1.3 | $ 4.5
DeRidder mill incident | 2.5 |  | (2.5) |
Hexacomb working capital adjustment |  |  | 2.3 |
Packaging And Corporate And Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Integration-related, facilities closure and other costs |  | $ 2.9 | 1.2 | $ 5.7
Packaging And Corporate And Other | Hexacomb in Europe and Mexico |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Hexacomb working capital adjustment |  |  | 2.3 |
DeRidder, Louisiana | Packaging |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Integration-related, facilities closure and other costs | $ 0.5 |  |  |
DeRidder mill incident |  |  | $ (5.0) |

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