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 ($)	Sep. 30, 2017 USD ($)
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