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Discontinued Operations, Divestitures and Acquisitions - Divestitures (Details) - Polystyrene Food Tray Business - Discontinued Operations, Held-for-sale BRL in Millions, $ in Millions | Dec. 31, 2017 BRL | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets held for sale |  |  | $ 4.9
Liabilities held for sale |  |  | $ 1.8
Scenario, Forecast |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Consideration | BRL 24.0 | $ 7.5 |

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