Acquisitions and Dispositions - Additional Information (Details) $ in Millions			1 Months Ended	3 Months Ended																	12 Months Ended
	Oct. 02, 2017 USD ($)	Aug. 29, 2016 USD ($) facility	Nov. 30, 2016 USD ($) facility	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	[1]	Sep. 30, 2017 USD ($)		Jun. 30, 2017 USD ($)	[3]	Mar. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)	[5]	Sep. 30, 2016 USD ($)	[6]	Jun. 30, 2016 USD ($)	[7]	Mar. 31, 2016 USD ($)	[8]	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Cash purchase price																					$ 273.8	$ 485.4
Net sales					$ 1,684.3		$ 1,640.1	[2]	$ 1,584.0		$ 1,536.5	[4]	$ 1,476.6		$ 1,484.0		$ 1,417.4		$ 1,401.0		6,444.9	5,779.0	$ 5,741.7
Sacramento Container Corporation
Business Acquisition [Line Items]
Acquisition completion date	Oct. 02, 2017
Cash purchase price	$ 265.0
Net sales																					$ 58.5
Percentage of net sales																					1.00%
Proforma net sales																					$ 6,600.0	$ 6,000.0
Working capital adjustment on purchase price	8.8
Increase to other net assets acquired, acquisition adjustment	$ 8.8			$ 8.8
Maximum Acquisition period to finalize valuation	12 months
Acquired finite-lived intangible assets, weighted average useful life	9 years 8 months 12 days
Northern Sheets LLC And Central California Sheets LLC
Business Acquisition [Line Items]
Percentage of membership interests acquired	100.00%
Columbus Container Inc
Business Acquisition [Line Items]
Cash purchase price			$ 99.7
Working capital adjustment on purchase price							2.2
Increase to other net assets acquired, acquisition adjustment																					(0.1)
Acquired finite-lived intangible assets, weighted average useful life			14 years 1 month 6 days
Number of corrugated products production facilities acquired | facility			1
Number of corrugated products warehousing facilities acquired | facility			5
Increase to goodwill, acquisition adjustment							$ 2.2														(4.7)
TimBar Corporation
Business Acquisition [Line Items]
Cash purchase price		$ 385.6
Working capital adjustment on purchase price											(1.1)
Acquired finite-lived intangible assets, weighted average useful life		14 years 2 months 12 days
Number of corrugated products production facilities acquired | facility		6
Increase to goodwill, acquisition adjustment																					$ (1.1)
Debt instrument, face amount		$ 385.0
Debt instrument, term		5 years
Purchase price											$ 384.5
Minimum | Sacramento Container Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life	1 year
Minimum | Columbus Container Inc
Business Acquisition [Line Items]
Property, plant and equipment useful life			1 year
Minimum | TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life		2 years
Maximum | Sacramento Container Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life	13 years
Maximum | Columbus Container Inc
Business Acquisition [Line Items]
Property, plant and equipment useful life			32 years
Maximum | TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life		24 years

[1] Includes $7.6 million of income primarily related to the sale of land corresponding to the closure of a corrugated products facility, partially offset by closure costs related to corrugated products facilities, a paper administration facility, and a corporate administration facility ($4.7 million after-tax or $0.05 per diluted share) and $0.9 million of charges related to the Sacramento Container acquisition and integration costs related to other recent acquisitions ($0.5 million after-tax or $0.01 per diluted share), and $8.0 million of charges related to our determination to discontinue production of uncoated free sheet and coated one-side grades at the Wallula, Washington mill in the second quarter of 2018 and convert the No. 3 paper machine to a high-performance 100% virgin kraft linerboard machine ($4.6 million after-tax or $0.05 per diluted share). Also includes $1.8 million of expense related to the write-off of deferred debt issuance costs in connection with the December 2017 debt refinancing ($1.1 million after-tax or $0.01 per diluted share), $2.0 million gain related to the expiration of a repurchase option corresponding to timberland previously sold ($1.2 million after-tax or 0.01 per diluted share), and $122.1 million of estimated income tax benefit related to the enactment in December 2017 of the Tax Cuts and Jobs Act (H.R.1) primarily for the re-measurement of our net deferred tax liability as a result of the reduction in the U.S. corporate income tax rate ($1.29 per diluted share).

[2] Includes $0.9 million of charges related to the closure of corrugated products facilities, a paper administration facility, and a lump sum settlement of a multiemployer pension plan withdrawal liability for one of our corrugated products facilities ($0.6 million after-tax or $0.01 per diluted share) and $0.5 million of charges related to the Sacramento Container acquisition and integration costs related to other recent acquisitions ($0.3 million after-tax or $0.0 per diluted share). Also includes $25.3 million of charges related to our determination to discontinue production of uncoated free sheet and coated one-side grades at the Wallula, Washington mill in the second quarter of 2018 and convert the No. 3 paper machine to a high-performance 100% virgin kraft linerboard machine ($15.5 million after-tax or $0.16 per diluted share) and $3.3 million of tax expense for the change in value of deferred taxes as a result of an internal legal entity consolidation that will simplify future operating activities ($0.04 per diluted share).

[3] Includes $0.3 million of charges related to the closure of corrugated products facilities ($0.3 million after-tax or $0.0 per diluted share) and $0.2 million of charges related to TimBar Corporation and Columbus Container integration costs ($0.1 after-tax or $0.0 per diluted share).

[4] Includes $0.6 million of charges related to the closure of corrugated products facilities and lump sum settlement of a multiemployer pension plan withdrawal liability for one of corrugated products facilities ($0.4 million after-tax or $0.1 per diluted share) and $0.2 million of charges related to TimBar Corporation and Columbus Container integration costs ($0.1 million after-tax or $0.0 per diluted share). Also includes $5.0 million of costs for the property damage and business interruption insurance deductible corresponding to the February 2017 explosion at our DeRidder, Louisiana mill ($3.1 million after-tax or $0.03 per diluted share) and $2.3 million of income related to a working capital adjustment from the April 2015 sale of our Hexacomb corrugated manufacturing operations in Europe and Mexico ($1.4 million after-tax or $0.01 per diluted share).

[5] Includes $4.5 million of charges related to the closure of a corrugated products facility and a paper products facility ($2.9 million after-tax or $0.03 per diluted share), $2.7 million of costs related to ceased production of softwood market pulp operations at our Wallula, Washington mill and the permanent shutdown of the No. 1 machine ($1.8 million after-tax or $0.02 per diluted share), and $1.2 million of charges related to the TimBar Corporation and Columbus Container acquisitions and integration ($0.8 million after-tax or $0.01 per diluted share).

[6] Includes $2.0 million of charges related to the closure of a corrugated products facility and a paper products facility ($1.4 million after-tax or $0.02 per diluted share) and $2.9 million of charges related to the TimBar Corporation and Columbus Container acquisitions and integration ($1.9 million after-tax or $0.02 per diluted share).

[7] Includes $2.6 million of charges related to the closure of corrugated products facilities, a paper products facility, and a lump sum settlement of a multiemployer pension plan withdrawal liability for one of our corrugated products facilities ($1.6 million after-tax or $0.02 per diluted share) and $0.3 million of charges related to the TimBar Corporation acquisition and integration ($0.2 million after-tax or $0.0 per diluted share).

[8] Includes $2.8 million of charges related to the closure of a corrugated products facility and a paper products facility ($1.9 million after-tax or $0.02 per diluted share).