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) | |||