Other Expense, Net - Components Expense, Net (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
		Sep. 30, 2015	[3]	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset disposals and write-offs				$ (11.9)		$ (14.0)		$ (10.1)
Facilities closure costs	[1]			(9.4)		0.0		0.0
Acquisition-related costs	[2]			(3.3)		0.0		0.0
Multiemployer pension withdrawal	[3]			(0.9)		0.0		0.0
Restructuring	[3]					7.1
Integration-related and other costs	[4]			0.0		(12.9)		(20.0)
Refundable state tax credit	[5]			0.0		3.6	[2]	0.0
Class action lawsuit settlement	[6]			0.0		0.0		(17.6)
Other				1.8		2.8		(2.3)
Total				(24.3)		(6.7)		(57.3)
Mill at St. Helens, Oregon
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of St. Helens Paper Mill Site		$ 6.7		0.0	[7]	6.7	[7]	0.0	[7]
Wallula Mill
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring	[8]			(0.6)		0.0		0.0
Deridder Mill
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring	[9]			$ 0.0		$ 7.1		$ (7.3)

[1] Includes facilities closure costs related to corrugated products facilities and a paper products facility.

[2] Includes acquisition-related costs for the TimBar Corporation and Columbus Container, Inc. acquisitions.

[3] Includes costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities.

[4] Includes Boise acquisition integration-related and other costs, which primarily relate to severance, retention, travel, and professional fees.

[5] Includes a $3.6 million tax credit from the State of Louisiana related to our recent capital investment and the jobs retained at the DeRidder, Louisiana mill, which was recorded as a benefit.

[6] Includes $17.6 million of costs for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit. See Note 18, Commitments, Guarantees, Indemnifications, and Legal Proceedings, for more information.

[7] In September 2015, we sold the remaining land, buildings, and equipment at our paper mill site in St. Helens, Oregon where we ceased paper production in December 2012. We recorded a $6.7 million gain on the sale.

[8] Includes costs related to ceased softwood market pulp operations at our Wallula, Washington mill and the permanent shutdown of the No. 1 machine.

[9] 2015 and 2014 include amounts from restructuring activities at our mill in DeRidder, Louisiana including costs related to the conversion of the No. 3 newsprint machine to containerboard, our exit from the newsprint business, and other improvements. We completed the restructuring activities in first quarter 2015. In 2015, we recorded $7.1 million of income from vendor settlements.