Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Wallula, Washington Mill
Segment Reporting Information [Line Items]
High-performance of virgin kraft linerboard machine percentage		100.00%
Paper \| Wallula, Washington Mill
Segment Reporting Information [Line Items]
Restructuring charges	$ 0.6		$ 8.8
High-performance of virgin kraft linerboard machine percentage	100.00%		100.00%
Packaging And Corporate And Other \| Corrugated Products Facility and Corporate Administration Facility Closure
Segment Reporting Information [Line Items]
Restructuring charges			$ 0.3