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Other (Expense) Income, Net - Components of Other (Expense) Income, Net (Parenthetical) (Details)	3 Months Ended						12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Wallula, Washington Mill
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
High-performance of virgin kraft linerboard machine percentage	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%

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