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High performance of virgin kraft linerboard machine percentage.

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Recoveries and cost of property damage and business interruption.

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Amount of other income attributable to disposal group, including, but not limited to, discontinued operation.

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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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Amount of restructuring charges, remediation cost, and asset impairment loss.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segment Information (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Acquisition and integration related costs	$ 0.5	$ 2.0	$ 0.8	$ 2.3
DeRidder mill incident	2.6		0.1
Hexacomb working capital adjustment			2.3
Wallula, Washington Mill
Segment Reporting Information [Line Items]
Facilities closure and other costs	22.7		22.7
Facilities closure and other costs	$ 25.3		$ 25.3
High-performance of virgin kraft linerboard machine percentage	100.00%		100.00%
Sacramento Container Corporation
Segment Reporting Information [Line Items]
Acquisition and integration related costs	$ 0.5		$ 0.8
TimBar Corporation
Segment Reporting Information [Line Items]
Acquisition and integration related costs		2.9		3.2
Packaging And Corporate And Other
Segment Reporting Information [Line Items]
Facilities closure and other costs	$ 0.9	$ 2.0	1.9	$ 7.4
Packaging And Corporate And Other \| Hexacomb in Europe and Mexico
Segment Reporting Information [Line Items]
Hexacomb working capital adjustment			2.3
Packaging \| DeRidder, Louisiana
Segment Reporting Information [Line Items]
DeRidder mill incident			$ (5.0)