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Other Income (Expense), Net (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Other Income And Expenses [Abstract] |  |  |  |
DeRidder mill incident | $ 2.5 |  | $ (2.5) |
Integration-related, facilities closure and other costs | $ (0.5) | $ (2.6) | (1.3) | $ (4.5)
Hexacomb working capital adjustment |  |  | $ 2.3 |

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