Packaging Corporation of America (PKG) 10-Q 4 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 28, 2016
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Trading Symbol	PKG
Entity Registrant Name	PACKAGING CORP OF AMERICA
Entity Central Index Key	75,677
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		94,226,326

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 1,484	$ 1,470.8	$ 4,302.4	$ 4,350.8
Cost of sales	(1,154.5)	(1,142.5)	(3,353.8)	(3,427.9)
Gross profit	329.5	328.3	948.6	922.9
Selling, general, and administrative expenses	(116.9)	(112.7)	(346)	(345.9)
Other income (expense), net	(6.2)	3.8	(15.2)	(2.9)
Income from operations	206.4	219.4	587.4	574.1
Interest expense, net	(23.4)	(21.7)	(67.5)	(63.2)
Income before taxes	183	197.7	519.9	510.9
Income tax provision	(63.7)	(69.9)	(181)	(178.3)
Net income	119.3	127.8	338.9	332.6
Less net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Packaging Corporation of America	$ 119.3	$ 127.8	$ 338.9	$ 332.6
Net income per common share attributable to Packaging Corporation of America common shareholders:
Basic (in dollars per share)	$ 1.27	$ 1.31	$ 3.59	$ 3.39
Diluted (in dollars per share)	1.26	1.31	3.58	3.39
Dividends declared per common share (in dollars per share)	$ 0.63	$ 0.55	$ 1.73	$ 1.65
Statements of Comprehensive Income:
Net income	$ 119.3	$ 127.8	$ 338.9	$ 332.6
Foreign currency translation adjustment	0	0	0	2.8
Reclassification adjustments to cash flow hedges included in net income, net of tax of $0.5 million, $0.5 million, $1.6 million, and $1.6 million	0.9	0.9	2.6	2.6
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $1.0 million, $1.4 million, $3.1 million, and $4.2 million	1.8	2.1	5	6.5
Changes in unfunded employee benefit obligations net of tax of $2.0 million	0	0	3.1	0
Other comprehensive income	2.7	3	10.7	11.9
Less net income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to Packaging Corporation of America	$ 122	$ 130.8	$ 349.6	$ 344.5

Consolidated Statements of Inc3

Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Reclassification adjustments to cash flow hedges included in net income, net of tax of $0.5 million, $0.5 million, $1.6 million, and $1.6 million	$ 500	$ 500	$ (1,600)	$ (1,600)
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $1.0 million, $1.4 million, $3.1 million, and $4.2 million	1,000	1,400	(3,100)	(4,200)
Changes in unfunded employee benefit obligation net of tax of $2.0 million	$ 0	$ 0	$ 2,000	$ 0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 279.8	$ 184.2
Accounts receivable, net of allowance for doubtful accounts and customer deductions of $9.4 million and $10.3 million as of September 30, 2016 and December 31, 2015, respectively	713.2	636.5
Inventories	690.6	676.8
Prepaid expenses and other current assets	45.1	28.8
Federal and state income taxes receivable	18.3	28.2
Total current assets	1,747	1,554.5
Property, plant, and equipment, net	2,878.7	2,832.1
Goodwill	692.1	544
Intangible assets, net	354.8	270.8
Other long-term assets	74.6	70.9
Total assets	5,747.2	5,272.3
Current liabilities:
Current maturities of long-term debt	25.8	6.5
Capital lease obligations	1.2	1.2
Accounts payable	327	294.2
Dividends payable	59.8	53.4
Accrued interest	18.8	13.1
Accrued liabilities	204.9	193.5
Total current liabilities	637.5	561.9
Long-term liabilities:
Long-term debt	2,625.8	2,290.4
Capital lease obligations	20.7	21.6
Deferred income taxes	360.9	347
Compensation and benefits	312.2	358.6
Other long-term liabilities	60.1	59.5
Total long-term liabilities	3,379.7	3,077.1
Commitments and contingent liabilities
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 94.2 million and 96.1 million shares issued as of September 30, 2016 and December 31, 2015, respectively	0.9	1
Additional paid in capital	446	439.9
Retained earnings	1,396.9	1,317.3
Accumulated other comprehensive loss	(114.2)	(124.9)
Total stockholders' equity	1,729.6	1,633.3
Noncontrolling interests	0.4	0
Total equity	1,730	1,633.3
Total liabilities and equity	$ 5,747.2	$ 5,272.3

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts and customer deductions of $9.4 million and $10.3 million as of September 30, 2016 and December 31, 2015, respectively	$ 9.4	$ 10.3
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300	300
Common stock, shares issued	94.2	96.1

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 338.9	$ 332.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization of intangibles	264.3	267.9
Amortization of deferred financing costs	5.8	5.8
Share-based compensation expense	15	13.7
Deferred income tax provision	6.5	1.2
Pension and postretirement benefits expense, net of contributions	(33.5)	24
Other, net	3.7	(16.4)
Decrease (increase) in assets —
Accounts receivable	(36)	(37.5)
Inventories	4.1	(31)
Prepaid expenses and other current assets	(11.2)	(16.8)
Increase (decrease) in liabilities —
Accounts payable	13.6	(14.1)
Accrued liabilities	10.8	5.2
Federal and state income taxes payable / receivable	6.2	7.4
Net cash provided by operating activities	588.2	542
Cash Flows from Investing Activities:
Additions to property, plant, and equipment	(188.1)	(217.9)
Proceeds from sale of a business	0	23
Acquisition of business, net of cash acquired	(385.6)	0
Additions to other long-term assets	(9.4)	(9.2)
Other, net	0.4	1.3
Net cash used for investing activities	(582.7)	(202.8)
Cash Flows from Financing Activities:
Repayments of debt and capital lease obligations	(30.7)	(30.7)
Proceeds from issuance of debt	385	0
Financing costs paid	(2.1)	0
Common stock dividends paid	(156.7)	(147.3)
Repurchases of common stock	(100.3)	(98.1)
Excess tax benefits from stock-based awards	5.3	5.6
Shares withheld to cover employee restricted stock taxes	(10.2)	(7.4)
Other, net	(0.2)	0.7
Net cash provided by (used for) financing activities	90.1	(277.2)
Net increase in cash and cash equivalents	95.6	62
Cash and cash equivalents, beginning of period	184.2	124.9
Cash and cash equivalents, end of period	$ 279.8	$ 186.9

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Basis of Presentation	Nature of Operations and Basis of Presentation Packaging Corporation of America ("we," "us," "our," PCA," or the "Company") was incorporated on January 25, 1999. In April 1999, PCA acquired the containerboard and corrugated packaging products business of Pactiv Corporation (Pactiv), formerly known as Tenneco Packaging, Inc., a wholly owned subsidiary of Tenneco Inc. We are a large diverse manufacturer of both packaging and paper products. We are headquartered in Lake Forest, Illinois and we operate primarily in the United States. We report our business in three reportable segments: Packaging, Paper, and Corporate and Other. Our Packaging segment produces a wide variety of corrugated packaging products. The Paper segment manufactures and sells a range of white papers, including communication-based papers and pressure sensitive papers, and market pulp. In October 2016, we announced that we will cease softwood market pulp operations at our Wallula, Washington mill and permanently shutdown the No. 1 machine, with pulp capacity of approximately 100,000 tons, effective December 1, 2016. Corporate and Other includes support staff services and related assets and liabilities, transportation assets, and activity related to other ancillary support operations. For more information about our segments, see Note 16 Segment Information . The consolidated financial statements of PCA as of September 30, 2016 and for the three and nine months ended September 30, 2016 and 2015 are unaudited but include all adjustments (consisting only of normal recurring adjustments) that management considers necessary for a fair presentation of such financial statements. The preparation of the consolidated financial statements involves the use of estimates and accruals. Actual results may vary from those estimates. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with Article 10 of SEC Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete audited financial statements. Operating results for the three and nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . These consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2015 . The consolidated financial statements include the accounts of PCA and its majority-owned subsidiaries after elimination of intercompany balances and transactions.

Acquisitions (Notes)

Acquisitions (Notes)	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions TimBar Acquisition On August 29, 2016, PCA acquired substantially all of the assets of TimBar Corporation (“TimBar”), a large independent corrugated products producer with six corrugated products production facilities, for a purchase price of $385.6 million , net of cash acquired. Funding for the acquisition came from a new $385.0 million five -year term loan facility. TimBar provides solutions to customers in the higher margin retail, industrial packaging and display and fulfillment markets with a focus on a multi-color graphics and technical innovation. With the August acquisition of TimBar, we acquired a 51% controlling interest in a wholesale distributor of polywoven plastic bags used in the transportation industry. TimBar financial results are included in the Packaging segment from the date of acquisition. The Company accounted for TimBar using the acquisition method of accounting in accordance with ASC 805, Business Combinations . The total purchase price has been preliminarily allocated to tangible and intangible assets acquired and liabilities assumed based on respective fair values, as follows (dollars in millions): Goodwill $ 148.1 Other intangible assets 101.6 Property, plant and equipment 96.9 Other net assets 39.0 Net assets acquired $ 385.6 The purchase price allocation presented above is preliminary and is subject to the finalization of various valuations and assessments, primarily related to property, plant, and equipment and intangible assets. Our current estimates and assumptions may change as more information becomes available. We expect to finalize the valuations within the 12-month period following the acquisition date. Goodwill is calculated as the excess of the purchase price over the fair value of the net assets acquired. Among the factors that contributed to the recognition of goodwill were TimBar's commitment to continuous improvement and innovation in their operations, as well as the expected increases in PCA's containerboard integration levels. Goodwill is expected to be deductible for tax purposes. Other intangible assets, primarily customer relationships, were assigned an estimated weighted average useful life of 14.5 years . Property, plant and equipment were assigned estimated useful lives ranging from two to 24 years .

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data): Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Numerator: Net income attributable to Packaging Corporation of America $ 119.3 $ 127.8 $ 338.9 $ 332.6 Less: distributed and undistributed earnings allocated to participating securities (1.1 ) (1.5 ) (3.4 ) (4.0 ) Net income attributable to common shareholders $ 118.2 $ 126.3 $ 335.5 $ 328.6 Denominator: Weighted average basic common shares outstanding 93.4 96.5 93.6 96.8 Effect of dilutive securities 0.2 0.1 0.1 0.1 Weighted average diluted common shares outstanding 93.6 96.6 93.7 96.9 Basic income per common share $ 1.27 $ 1.31 $ 3.59 $ 3.39 Diluted income per common share $ 1.26 $ 1.31 $ 3.58 $ 3.39

Other Income (Expense), Net

Other Income (Expense), Net	9 Months Ended
	Sep. 30, 2016
Other Income and Expenses [Abstract]
Other Income (Expense), Net	Other Income (Expense), Net The components of other income (expense), net, were as follows (dollars in millions): Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Facilities closure costs (a) $ (1.6 ) $ — $ (5.0 ) $ — Acquisition-related costs (b) (2.0 ) — (2.3 ) — Multiemployer pension withdrawal (c) — — (0.9 ) — Asset disposals and write-offs (0.6 ) (5.0 ) (3.5 ) (9.7 ) Integration-related and other costs (d) — (2.4 ) — (9.0 ) Sale of St. Helens paper mill site (e) — 6.7 — 6.7 DeRidder restructuring (f) — 3.8 — 3.6 Refundable state tax credit (g) — — — 3.6 Other (2.0 ) 0.7 (3.5 ) 1.9 Total $ (6.2 ) $ 3.8 $ (15.2 ) $ (2.9 ) ___________ (a) The three and nine months ended September 30, 2016 include facilities closure costs related to corrugated products facilities and a paper products facility. (b) The three and nine months ended September 30, 2016 include acquisition-related costs for the TimBar Corporation acquisition. (c) The nine months ended September 30, 2016 include costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities. (d) The three and nine months ended September 30, 2015 include Boise acquisition integration-related and other costs. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs. (e) The three and nine months ended September 30, 2015 include a gain on the sale of the paper mill site in St. Helens, Oregon, where we ceased paper production in December 2012. (f) The three and nine months ended September 30, 2015 include amounts from restructuring activities at our mill in DeRidder, Louisiana. (g) The nine months ended September 30, 2015 include a tax credit from the State of Louisiana related to our capital investment and the jobs retained at the DeRidder, Louisiana mill.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended September 30, 2016 and 2015 we recorded $63.7 million and $69.9 million of income tax expense and had an effective tax rate of 34.8% and 35.4% , respectively. For the nine months ended September 30, 2016 and 2015, we recorded $181.0 million and $178.3 million of income tax expense and had an effective tax rate of 34.8% and 34.9% , respectively. The decrease in our effective tax rate for the three and nine months ended September 30, 2016 compared with the same periods in 2015, was primarily due to the 2016 benefit of federal income tax credits that were not available at September 30, 2015 due to the expiration and later reinstatement on December 18, 2015 as part of the Protecting Americans from Tax Hikes Act (PATH Act). Our effective tax rate may differ from the federal statutory income tax rate of 35.0% , due primarily to the effect of the domestic manufacturing deduction and state and local income taxes. During the three and nine months ended September 30, 2016 there were no significant changes to our uncertain tax positions. For more information, see Note 6, Income Taxes, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K. During the nine months ended September 30, 2016 and 2015 cash paid for taxes, net of refunds received, was $158.8 million and $163.7 million , respectively.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories We value our raw materials, work in process, and finished goods inventories using lower of cost, as determined by the average cost method, or market. Supplies and materials are valued at the first-in, first-out (FIFO) or average cost methods. The components of inventories were as follows (dollars in millions): September 30, December 31, Raw materials $ 259.8 $ 260.6 Work in process 14.9 14.2 Finished goods 188.0 189.7 Supplies and materials 227.9 212.3 Inventories $ 690.6 $ 676.8

Property, Plant, and Equipment

Property, Plant, and Equipment	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment	Property, Plant, and Equipment The components of property, plant, and equipment were as follows (dollars in millions): September 30, December 31, Land and land improvements $ 148.6 $ 146.4 Buildings 687.8 640.9 Machinery and equipment 4,902.2 4,747.1 Construction in progress 151.2 119.1 Other 62.6 61.3 Property, plant, and equipment, at cost 5,952.4 5,714.8 Less accumulated depreciation (3,073.7 ) (2,882.7 ) Property, plant, and equipment, net $ 2,878.7 $ 2,832.1 Depreciation expense for the three months ended September 30, 2016 and 2015 was $79.9 million and $79.6 million , respectively. During the nine months ended September 30, 2016 and 2015, depreciation expense was $240.5 million and $243.5 million , respectively. During the nine months ended September 30, 2016 and 2015, we recognized $0.8 million and $9.0 million , respectively, of incremental depreciation expense from shortening the useful lives of assets related to facilities closures in 2016 and restructuring activities at our DeRidder, Louisiana mill in 2015. At September 30, 2016 and December 31, 2015 purchases of property, plant, and equipment included in accounts payable were $20.1 million and $15.0 million , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill Changes in the carrying amount of our goodwill are as follows (dollars in millions): Goodwill Balance at December 31, 2015 $ 544.0 Acquisition (a) 148.1 Balance at September 30, 2016 $ 692.1 ___________ (a) In connection with the August 2016 acquisition of TimBar Corporation (TimBar), the Company recorded $148.1 million of goodwill in the Packaging segment. Goodwill represents the excess of the cost of an acquired business over the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed in a business combination. At September 30, 2016 and December 31, 2015 we had $636.9 million and $488.8 million of goodwill recorded in our Packaging segment, respectively. At both September 30, 2016 and December 31, 2015 we had $55.2 million of goodwill recorded in our Paper segment. Intangible Assets Intangible assets are primarily comprised of customer relationships and trademarks and trade names. The weighted average remaining useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions): September 30, 2016 December 31, 2015 Weighted Average Remaining Useful Life (in Years) Gross Accumulated Weighted Average Remaining Useful Life (in Years) Gross Accumulated Customer relationships (b) 13.3 $ 408.0 $ 73.2 13.3 $ 311.5 $ 57.3 Trademarks and trade names (b) 11.7 25.6 6.9 13.6 21.8 5.2 Other (b) 2.9 1.5 0.2 1.2 0.2 0.2 Total intangible assets (excluding goodwill) 13.2 $ 435.1 $ 80.3 13.6 $ 333.5 $ 62.7 ___________ (b) In connection with the August 2016 acquisition of TimBar, the Company recorded intangible assets of $96.5 million for customer relationships, $3.8 million for trade names, and $1.3 million for other intangibles. During the three months ended September 30, 2016 and 2015, amortization expense was $6.3 million and $5.7 million , respectively. During the nine months ended September 30, 2016 and 2015 , amortization expense was $17.5 million and $17.1 million , respectively.

Accrued Liabilities

Accrued Liabilities	9 Months Ended
	Sep. 30, 2016
Accrued Liabilities [Abstract]
Accrued Liabilities	Accrued Liabilities The components of accrued liabilities were as follows (dollars in millions): September 30, December 31, Compensation and benefits $ 114.7 $ 106.4 Medical insurance and workers’ compensation 32.0 31.1 Franchise, property, and sales and use taxes 19.4 16.0 Customer volume discounts and rebates 20.1 15.3 Environmental liabilities and asset retirement obligations 7.1 7.9 Severance, retention, and relocation 3.3 7.3 Other 8.3 9.5 Total $ 204.9 $ 193.5

Debt

Debt	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Debt	Debt At September 30, 2016 and December 31, 2015, our long-term debt and interest rates on that debt were as follows (dollars in millions): September 30, 2016 December 31, 2015 Amount Interest Rate Amount Interest Rate Revolving Credit Facility, due October 2018 $ — — % $ — — % Revolving Credit Facility, due August 2021 — — — — Five-Year Term Loan, due October 2018 — — 25.0 1.80 Five-Year Term Loan, due August 2021 385.0 1.77 — — Seven-Year Term Loan, due October 2020 632.1 2.15 637.0 2.05 6.50% Senior Notes due March 2018 150.0 6.50 150.0 6.50 3.90% Senior Notes, net of discounts of $0.2 million and $0.3 million as of September 30, 2016 and December 31, 2015, due June 2022 399.8 3.90 399.7 3.90 4.50% Senior Notes, net of discount of $1.4 million and $1.5 million as of September 30, 2016 and December 31, 2015, due November 2023 698.6 4.50 698.5 4.50 3.65% Senior Notes, net of discount of $0.9 million and $1.0 million as of September 30, 2016 and December 31, 2015, due September 2024 399.1 3.65 399.0 3.65 Total 2,664.6 3.44 % 2,309.2 3.67 % Less current portion 25.8 6.5 Less unamortized debt issuance costs 13.0 12.3 Total long-term debt $ 2,625.8 $ 2,290.4 On August 29, 2016 (the "Amendment Date"), PCA amended and restated its five -year credit agreement dated October 18, 2013 (the "Credit Agreement"), to finance its acquisition of TimBar Corporation. The amended agreement includes: (i) a new $385.0 million unsecured five -year term loan facility (the “New Term Loan”), which PCA fully borrowed on the Amendment Date to finance its acquisition of TimBar Corporation; (ii) the existing $650.0 million unsecured seven -year term loan facility initially borrowed by PCA under the original Credit Agreement (the “Existing Term Loan”), which terminates in October 2020 and under which $633.7 million was outstanding as of the Amendment Date; and (iii) a $350.0 million unsecured revolving credit facility, which was extended through the fifth anniversary of the Amendment Date, and is available for borrowings for general corporate purposes. Except for $25.0 million of letters of credit, no amounts were outstanding under the revolving credit facility as of the Amendment Date. Loans under the amended Credit Agreement bear interest at LIBOR plus an applicable margin. The applicable margin is determined based upon the public ratings of PCA’s senior long-term unsecured debt. The amended Credit Agreement contains customary affirmative and negative covenants, including limitations on liens, mergers and consolidations, sales of assets and subsidiary indebtedness. The amended Credit Agreement has two financial covenants, a maximum ratio of debt to EBITDA and a minimum interest coverage ratio, each calculated on a consolidated basis. PCA may prepay loans under the amended Credit Agreement at any time without premium or penalty. During the nine months ended September 30, 2016 , we made principal payments of $25.0 million and $4.9 million on our five-year term loan due October 2018 (which is no longer outstanding) and our seven -year term loan due October 2020, respectively. During the nine months ended September 30, 2015, we made principal payments of $25.0 million on our five -year term loan due October 2018, and $4.9 million on our seven -year term loan, due October 2020. For the nine months ended September 30, 2016 and 2015 cash payments for interest were $59.5 million and $58.6 million , respectively. Included in interest expense, net, are amortization of treasury lock settlements and amortization of financing costs. For both the three months ended September 30, 2016 and 2015 amortization of treasury lock settlements was $1.4 million , and for both the nine months ended September 30, 2016 and 2015, amortization of treasury lock settlements was $4.2 million . For both the three months ended September 30, 2016 and 2015 amortization of financing costs was $0.5 million , and during the nine months ended for both September 30, 2016 and 2015, amortization of financing costs was $1.4 million and $1.3 million , respectively. At September 30, 2016 we had $1,647.5 million of fixed-rate senior notes and $1,017.1 million of variable-rate term loans outstanding. At September 30, 2016 the fair value of our fixed-rate debt was estimated to be $1,767.1 million . The difference between the book value and fair value is due to the difference between the period-end market interest rate and the stated rate of our fixed-rate debt. We estimated the fair value of our fixed-rate debt using quoted market prices (Level 2 inputs) within the fair value hierarchy, which is further defined in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K. The fair value of our variable-rate term debt approximates the carrying amount as our cost of borrowing is variable and approximates current market rates. For more information on our long-term debt and interest rates on that debt, see Note 10, Debt, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K.

Employee Benefit Plans and Othe

Employee Benefit Plans and Other Postretirement Benefits	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans and Other Postretirement Benefits	Employee Benefit Plans and Other Postretirement Benefits The components of net periodic benefit cost for our pension plans were as follows (dollars in millions): Pension Plans Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Service cost $ 6.2 $ 6.1 $ 18.4 $ 17.9 Interest cost 10.2 11.6 30.6 34.6 Expected return on plan assets (12.3 ) (13.3 ) (37.1 ) (39.8 ) Net amortization of unrecognized amounts Prior service cost 1.4 1.4 4.3 4.2 Actuarial loss 1.5 2.1 4.3 6.4 Net periodic benefit cost $ 7.0 $ 7.9 $ 20.5 $ 23.3 PCA makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). From time to time, PCA may make additional discretionary contributions based on the funded status of the plans, tax deductibility, income from operations, and other factors. We made contributions of $49.7 million and $53.0 million to our qualified plans during the three and nine months ended September 30, 2016 which exceeded our 2016 minimum pension contributions of $27.0 million . In 2015, we did not make any contributions to our qualified plans. The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions): Postretirement Plans Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Service cost $ 0.1 $ 0.4 $ 0.5 $ 1.3 Interest cost 0.1 0.3 0.5 0.9 Net amortization of unrecognized amounts Prior service cost (0.1 ) — (0.1 ) — Actuarial (income) loss — — (0.4 ) 0.1 Net periodic benefit cost $ 0.1 $ 0.7 $ 0.5 $ 2.3 In April 2016, the Company provided notice to eligible participants that the Salaried Retiree Medical Plan would be frozen as of December 31, 2016. As a result of the freeze, eligible plan participants who do not retire and elect coverage before December 31, 2016 lose benefits attributable to service already rendered. In accordance with Accounting Standards Codification (ASC) 715, "Compensation--Retirement Benefits", the Company remeasured the Salaried Retiree Medical Plan benefit obligation using current assumptions, resulting in a decrease in the benefit obligation of $5.1 million with a corresponding increase in accumulated other comprehensive income of $3.1 million and deferred income taxes of $2.0 million .

Share-based Compensation

Share-based Compensation	9 Months Ended
	Sep. 30, 2016
Share-based Compensation [Abstract]
Share-based Compensation	Share-Based Compensation The Company has a long-term equity incentive plan, which allows for grants of restricted stock, performance awards, stock appreciation rights, and stock options to directors, officers, and employees, as well as others who engage in services for PCA. The Company has not granted option awards since 2007. The plan, as amended, terminates May 1, 2023 and authorizes 10.6 million shares of common stock for grant over the life of the plan. As of September 30, 2016 , 1.2 million shares were available for future issuance under the plan. Forfeitures are added back to the pool of shares of common stock available to be granted at a future date. The following table presents restricted stock and performance unit award activity for the nine months ended September 30, 2016 : Restricted Stock Performance Units Shares Weighted Average Grant- Date Fair Value Shares Weighted Average Grant- Date Fair Value Outstanding at January 1, 2016 1,007,794 $ 49.47 175,675 $ 59.94 Granted 242,835 67.48 77,017 67.57 Vested (a) (417,544 ) 33.19 (20,604 ) 57.58 Forfeitures (18,233 ) 58.72 — — Outstanding at September 30, 2016 814,852 $ 62.98 232,088 $ 62.68 ___________ (a) Upon vesting of the performance unit awards, PCA issued 21,111 shares of its common stock, which included 507 shares for dividends accrued during the vesting period. Compensation Expense Our share-based compensation expense is recorded in "Selling, general, and administrative expenses". Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures, was as follows (dollars in millions): Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Restricted stock $ 3.5 $ 3.7 $ 12.2 $ 11.7 Performance units 1.3 0.9 2.8 2.0 Total share-based compensation expense 4.8 4.6 15.0 13.7 Income tax benefit (1.8 ) (1.8 ) (5.8 ) (5.3 ) Share-based compensation expense, net of tax benefit $ 3.0 $ 2.8 $ 9.2 $ 8.4 The fair value of restricted stock and performance units is determined based on the closing price of the Company’s common stock on the grant date. As PCA’s Board of Directors has the ability to accelerate vesting of share-based awards upon an employee’s retirement, the Company accelerates the recognition of compensation expense for certain employees approaching normal retirement age. The unrecognized compensation expense for all share-based awards at September 30, 2016 was as follows (dollars in millions): September 30, 2016 Unrecognized Compensation Expense Remaining Weighted Average Recognition Period (in years) Restricted stock $ 30.7 2.9 Performance units 9.1 3.0 Total unrecognized share-based compensation expense $ 39.8 2.9

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Dividends During the nine months ended September 30, 2016 , we paid $156.7 million of dividends to shareholders. On August 31, 2016 PCA announced an increase of its quarterly cash dividend on its common stock from an annual payout of $2.20 per share to $2.52 per share. Also, on August 31, 2016 PCA's Board of Directors declared a regular quarterly cash dividend of $0.63 per share, which was paid on October 14, 2016 to shareholders of record as of September 15, 2016. The October 2016 dividend payment was $59.4 million . Repurchases of Common Stock On February 25, 2016 PCA announced that its Board of Directors authorized the repurchase of an additional $200.0 million of the Company’s outstanding common stock. Repurchases may be made from time to time in open market or privately negotiated transactions in accordance with applicable securities regulations. The timing and amount of repurchases will be determined by the Company in its discretion based on factors such as PCA’s stock price and market and business conditions. During the nine months ended September 30, 2016 , we paid $100.3 million to repurchase 1,987,187 shares of common stock. Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) (AOCI) by component were as follows. Amounts in parentheses indicate losses (dollars in millions): Unrealized Loss On Treasury Locks, Net Unrealized Loss on Foreign Exchange Contracts Unfunded Employee Benefit Obligations Total Balance at January 1, 2016 $ (21.2 ) $ (0.4 ) $ (103.3 ) $ (124.9 ) Other comprehensive income (loss) before reclassifications, net of tax — — 3.1 3.1 Amounts reclassified from AOCI, net of tax 2.6 (a) — 5.0 (b) 7.6 Balance at September 30, 2016 $ (18.6 ) $ (0.4 ) $ (95.2 ) $ (114.2 ) Reclassifications out of AOCI were as follows. Amounts in parentheses indicate expenses in the Consolidated Statements of Income (dollars in millions): Amounts Reclassified from AOCI Three Months Ended September 30 Nine Months Ended September 30 Affected Line Item in the Statement Where Net Income is Presented Details about AOCI Components 2016 2015 2016 2015 Foreign currency translation adjustments $ — $ — $ — $ (4.2 ) Other expense, net — — — — Tax benefit $ — $ — $ — $ (4.2 ) Net of tax Unrealized loss on treasury locks, net $ (1.4 ) $ (1.4 ) $ (4.2 ) $ (4.2 ) See (a) below 0.5 0.5 1.6 1.6 Tax benefit $ (0.9 ) $ (0.9 ) $ (2.6 ) $ (2.6 ) Net of tax Unfunded employee benefit obligations Amortization of prior service costs $ (1.3 ) $ (1.4 ) $ (4.2 ) $ (4.2 ) See (b) below Amortization of actuarial losses (1.5 ) (2.1 ) (3.9 ) (6.5 ) See (b) below (2.8 ) (3.5 ) (8.1 ) (10.7 ) Total before tax 1.0 1.4 3.1 4.2 Tax benefit $ (1.8 ) $ (2.1 ) $ (5.0 ) $ (6.5 ) Net of tax ____________ (a) This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ( $3.5 million after tax). For a discussion of treasury lock derivative instrument activity, see Note 14, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K. (b) These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 11 , Employee Benefit Plans and Other Postretirement Benefits , for additional information.

Concentrations of Risk

Concentrations of Risk	9 Months Ended
	Sep. 30, 2016
Risks and Uncertainties [Abstract]
Concentration of Risk	Concentrations of Risk Our Paper segment has had a long-standing commercial and contractual relationship with Office Depot, our largest customer in the paper business. This relationship exposes us to a significant concentration of business and financial risk. Our sales to Office Depot represent approximately 8% and 9% of our total Company sales revenue, for the nine months ended September 30, 2016 and 2015, respectively, and approximately 41% and 45% of our Paper segment sales revenue for both those periods, respectively. At September 30, 2016 and December 31, 2015 we had $31.6 million and $39.5 million of accounts receivable due from Office Depot, which represents 4% and 6% of our total Company accounts receivable, respectively. In 2015, sales to Office Depot represented 45% of our Paper segment sales. If these sales are reduced, we would need to find new customers. We may not be able to fully replace any lost sales, and any new sales may be at lower prices or higher costs. Any significant deterioration in the financial condition of Office Depot affecting its ability to pay or any other change that affects its willingness to purchase our products will harm our business and results of operations. During the second quarter of 2016, Office Depot and Staples terminated their merger agreement, and the acquisition of Office Depot by Staples was not completed. We continue to do business in the ordinary course with Office Depot.

Transactions With Related Parti

Transactions With Related Parties	9 Months Ended
	Sep. 30, 2016
Related Party Transactions [Abstract]
Transactions With Related Parties	Transactions With Related Parties Louisiana Timber Procurement Company, L.L.C. (LTP) is a variable-interest entity that is 50% owned by PCA and 50% owned by Boise Cascade Company (Boise Cascade). LTP procures sawtimber, pulpwood, residual chips, and other residual wood fiber to meet the wood and fiber requirements of PCA and Boise Cascade in Louisiana. PCA is the primary beneficiary of LTP, and has the power to direct the activities that most significantly affect the economic performance of LTP. Therefore, we consolidate 100% of LTP in our financial statements in our Corporate and Other segment. The carrying amounts of LTP's assets and liabilities (which relate primarily to noninventory working capital items) on our Consolidated Balance Sheets were $5.1 million at September 30, 2016 and $4.5 million at December 31, 2015 . During the three months ended September 30, 2016 and 2015, we recorded $15.5 million and $25.2 million , respectively, and during the nine months ended September 30, 2016 and 2015 we recorded $54.8 million and $70.3 million , respectively, of LTP sales to Boise Cascade in "Net Sales" in the Consolidated Statements of Income and approximately the same amount of expenses in "Cost of Sales". The sales were at prices designed to approximate market prices. During the three months ended September 30, 2016 and 2015 , fiber purchases from related parties were $3.9 million and $5.0 million , respectively. Fiber purchases were $13.2 million and $16.3 million during the nine months ended September 30, 2016 and 2015, respectively. Most of these purchases related to chip and log purchases by LTP from Boise Cascade's wood products business. These purchases are recorded in "Cost of Sales" in the Consolidated Statements of Income.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information We report our business in three reportable segments: Packaging, Paper, and Corporate and Other. These segments represent distinct businesses that are managed separately because of differing products and services. Each of these businesses requires distinct operating and marketing strategies. Each segment's profits and losses are measured on operating profits before interest expense, net, and income taxes. For many of these allocated expenses, the related assets and liabilities remain in the Corporate and Other segment. Selected financial information by reportable segment was as follows (dollars in millions): Sales, net Operating Income (Loss) Three Months Ended September 30, 2016 Trade Inter-segment Total Packaging $ 1,165.0 $ 2.1 $ 1,167.1 $ 179.6 (a) Paper 292.8 — 292.8 44.5 (a) Corporate and Other 26.2 36.7 62.9 (17.7 ) Intersegment eliminations — (38.8 ) (38.8 ) — $ 1,484.0 $ — $ 1,484.0 206.4 Interest expense, net (23.4 ) Income before taxes $ 183.0 Sales, net Operating Income (Loss) Three Months Ended September 30, 2015 Trade Inter-segment Total Packaging $ 1,144.0 $ 0.4 $ 1,144.4 $ 198.2 (b) Paper 291.9 — 291.9 39.5 (c) Corporate and Other 34.9 36.3 71.2 (18.3 ) (d) Intersegment eliminations — (36.7 ) (36.7 ) — $ 1,470.8 $ — $ 1,470.8 219.4 Interest expense, net (21.7 ) Income before taxes $ 197.7 Sales, net Operating Income (Loss) Nine Months Ended September 30, 2016 Trade Inter-segment Total Packaging $ 3,382.4 $ 5.5 $ 3,387.9 $ 533.5 (a) Paper 840.1 — 840.1 105.0 (a) Corporate and Other 79.9 105.7 185.6 (51.1 ) (a) Intersegment eliminations — (111.2 ) (111.2 ) — $ 4,302.4 $ — $ 4,302.4 587.4 Interest expense (67.5 ) Income before taxes $ 519.9 Sales, net Operating Income (Loss) Nine Months Ended September 30, 2015 Trade Inter-segment Total Packaging $ 3,382.8 $ 3.1 $ 3,385.9 $ 533.9 (b) Paper 870.3 — 870.3 98.6 (c) Corporate and Other 97.7 101.0 198.7 (58.4 ) (d) Intersegment eliminations — (104.0 ) (104.0 ) — $ 4,350.8 $ — $ 4,350.8 574.1 Interest expense (63.2 ) Income before taxes $ 510.9 ___________ (a) The three and nine months ended September 30, 2016 include $2.0 million and $6.5 million , respectively, of closure costs related to corrugated products facilities and a paper products facility. The closure costs are recorded within "Other income (expense), net" and "Cost of sales", as appropriate. The three and nine months ended September 30, 2016 include $2.9 million and $3.2 million of acquisition-related costs for the TimBar Corporation acquisition, which we recorded in "Other income (expense), net". The nine months ended September 30, 2016 include $0.9 million of costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities. (b) The three and nine months ended September 30, 2015 include $3.8 million of income and $5.4 million of expense, respectively, related to restructuring charges at our mill in DeRidder, Louisiana, which were recorded in "Other income (expense), net" and "Cost of sales", as appropriate. The nine months ended September 30, 2015 include $2.7 million of Boise acquisition integration-related and other costs, respectively. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs, and are mostly recorded in "Other income (expense), net". (c) 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, in "Other income (expense), net". (d) The three and nine months ended September 30, 2015 include $2.4 million and $6.9 million , respectively, of Boise acquisition integration-related and other costs, mostly recorded in "Other income (expense), net".

New and Recently Adopted Accoun

New and Recently Adopted Accounting Standards	9 Months Ended
	Sep. 30, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New and Recently Adopted Accounting Standards	New and Recently Adopted Accounting Standards In August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . This ASU adds or clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows. It is effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods, with early adoption permitted. The Company does not expect this ASU to have a material impact on the Company's financial condition, results of operations, or cash flows. In March 2016, the FASB issued ASU 2016-09 (Topic 718): Improvements to Employee Share-Based Payment Accounting . This ASU is intended to improve the accounting for share-based payment transactions as part of the FASB's simplification initiative. Under the ASU, all excess tax benefits and tax deficiencies will be recorded as an income tax benefit or expense in the income statement on a prospective basis. The excess tax benefits or deficiencies will be calculated as the difference between the amount of compensation expense for financial reporting purposes and the amount of compensation expense for tax purposes. We have no unrecognized excess tax benefits to record upon the adoption of this ASU. The ASU is effective for fiscal years beginning after December 15, 2016, and interim periods within those years for public business entities. We are continuing to evaluate the effect of the adoption of this ASU on our financial statements and will apply the ASU beginning January 1, 2017 for our first quarter ended March 31, 2017. In February 2016, the FASB issued ASU 2016-02 (Topic 842): Leases. This ASU amends a number of aspects of lease accounting, including requiring lessees to recognize operating leases with a term greater than one year on their balance sheet as a right-of-use asset and corresponding lease liability, measured at the present value of the lease payments. This ASU will be effective for us beginning in our first quarter of 2019 and early adoption is permitted. This ASU is required to be adopted using a modified retrospective approach. We are evaluating the timing and effects of the adoption of this ASU on our financial statements. Effective January 1, 2016, the Company adopted ASU 2015-03 (Topic 835): Simplifying the Presentation of Debt Issuance Costs . This ASU conforms the presentation of debt issuance costs with that required for debt discounts under U.S. Generally Accepted Accounting Principles (GAAP). Under the ASU, debt issuance costs are presented in the balance sheet as a direct deduction from the related liability rather than as an asset. We applied this guidance retrospectively, as required, and reclassified $12.3 million from "Other long-term assets" to "Long-term debt" on our December 31, 2015 Consolidated Balance Sheet to conform with current period presentation. At September 30, 2016 deferred financing costs were $13.0 million . In July 2015, the FASB issued ASU 2015-11 (Topic 330): Simplifying the Measurement of Inventory . This ASU addresses only the measurement of inventory if its value declines or is impaired. The guidance on determining the cost of inventory is not amended. We continue to apply average cost to determine the cost of inventory and will then compare that to the net realizable value to determine if an inventory write-down is necessary. The ASU is effective January 1, 2017, and we do not expect it to have a material effect on our financial position or results of operations. In May 2014, the FASB issued ASU 2014-09 (Topic 606): Revenue from Contracts with Customers . This ASU amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. The ASU implements a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenues and cash flows from contracts with customers. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers - Principal versus Agent Considerations (Reporting revenue gross versus net) , which clarifies gross versus net revenue reporting when another party is involved in the transaction. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers-Identifying Performance Obligations and Licensing , which amends the revenue guidance on identifying performance obligations and accounting for licenses of intellectual property. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers - Narrow-Scope Improvements and Practical Expedients , which provides narrow-scope improvements to the guidance on collectability, non-cash consideration, and completed contracts at transition. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The standard will be effective for reporting periods beginning after December 15, 2017. We are still assessing the impact of ASU 2014-09, but we do not believe it will have a material effect on our financial position or results of operations. There were no other accounting standards recently issued that had or are expected to have a material impact on our financial position or results of operations.

Commitments, Guarantees, Indemn

Commitments, Guarantees, Indemnifications and Legal Proceedings	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments, Guarantees, Indemnifications and Legal Proceedings	Commitments, Guarantees, Indemnifications and Legal Proceedings We have financial commitments and obligations that arise in the ordinary course of our business. These include long-term debt, capital commitments, lease obligations, and purchase commitments for goods and services, and legal proceedings, all of which are discussed in Note 10, Debt, and Note 19, Commitments, Guarantees, Indemnifications, and Legal Proceedings, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K. Guarantees and Indemnifications We provide guarantees, indemnifications, and other assurances to third parties in the normal course of our business. These include tort indemnifications, product guarantees, environmental assurances, and representations and warranties in commercial agreements. At September 30, 2016 we are not aware of any material liabilities arising from any guarantee, indemnification, or financial assurance we have provided. If we determined such a liability was probable and subject to reasonable determination, we would accrue for it at that time. Legal Proceedings We are party to legal actions arising in the ordinary course of our business. These legal actions include commercial liability claims, premises liability claims, commercial disputes, and employment-related claims, among others. As of the date of this filing, we believe it is not reasonably possible that any of the legal actions against us will, either individually or in the aggregate, have a material adverse effect on our financial condition, results of operations, or cash flows.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has disclosed the following subsequent event in accordance with Accounting Standards Codification (ASC) 855, “Subsequent Events.” Subsequent events have been evaluated through the filing date of this Form 10-Q. On October 11, 2016, we entered into a definitive agreement to acquire substantially all the assets of Columbus Container, Inc., for a cash purchase price of $100 million . Columbus Container, Inc. is a full-service provider of corrugated packaging products. Columbus Container's operations include a full-line corrugated products plant and five warehousing facilities and other related operations located in Indiana and Illinois. Closing is subject to certain customary conditions and is expected in the fourth quarter of 2016. PCA expects to finance the transaction with available cash on hand. The operating results of Columbus Container will be included in PCA’s results upon closing of the transaction. In October 2016, we announced that we will cease softwood market pulp operations at our Wallula, Washington mill and permanently shutdown the No. 1 machine, with pulp capacity of approximately 100,000 tons, effective December 1, 2016.

Nature of Operations and Basi26

Nature of Operations and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reportable Segments	We report our business in three reportable segments: Packaging, Paper, and Corporate and Other. Our Packaging segment produces a wide variety of corrugated packaging products. The Paper segment manufactures and sells a range of white papers, including communication-based papers and pressure sensitive papers, and market pulp. In October 2016, we announced that we will cease softwood market pulp operations at our Wallula, Washington mill and permanently shutdown the No. 1 machine, with pulp capacity of approximately 100,000 tons, effective December 1, 2016. Corporate and Other includes support staff services and related assets and liabilities, transportation assets, and activity related to other ancillary support operations. For more information about our segments, see Note 16 Segment Information .
Recent Accounting Pronouncements	In March 2016, the FASB issued ASU 2016-09 (Topic 718): Improvements to Employee Share-Based Payment Accounting . This ASU is intended to improve the accounting for share-based payment transactions as part of the FASB's simplification initiative. Under the ASU, all excess tax benefits and tax deficiencies will be recorded as an income tax benefit or expense in the income statement on a prospective basis. The excess tax benefits or deficiencies will be calculated as the difference between the amount of compensation expense for financial reporting purposes and the amount of compensation expense for tax purposes. We have no unrecognized excess tax benefits to record upon the adoption of this ASU. The ASU is effective for fiscal years beginning after December 15, 2016, and interim periods within those years for public business entities. We are continuing to evaluate the effect of the adoption of this ASU on our financial statements and will apply the ASU beginning January 1, 2017 for our first quarter ended March 31, 2017. In February 2016, the FASB issued ASU 2016-02 (Topic 842): Leases. This ASU amends a number of aspects of lease accounting, including requiring lessees to recognize operating leases with a term greater than one year on their balance sheet as a right-of-use asset and corresponding lease liability, measured at the present value of the lease payments. This ASU will be effective for us beginning in our first quarter of 2019 and early adoption is permitted. This ASU is required to be adopted using a modified retrospective approach. We are evaluating the timing and effects of the adoption of this ASU on our financial statements. Effective January 1, 2016, the Company adopted ASU 2015-03 (Topic 835): Simplifying the Presentation of Debt Issuance Costs . This ASU conforms the presentation of debt issuance costs with that required for debt discounts under U.S. Generally Accepted Accounting Principles (GAAP). Under the ASU, debt issuance costs are presented in the balance sheet as a direct deduction from the related liability rather than as an asset. We applied this guidance retrospectively, as required, and reclassified $12.3 million from "Other long-term assets" to "Long-term debt" on our December 31, 2015 Consolidated Balance Sheet to conform with current period presentation. At September 30, 2016 deferred financing costs were $13.0 million . In July 2015, the FASB issued ASU 2015-11 (Topic 330): Simplifying the Measurement of Inventory . This ASU addresses only the measurement of inventory if its value declines or is impaired. The guidance on determining the cost of inventory is not amended. We continue to apply average cost to determine the cost of inventory and will then compare that to the net realizable value to determine if an inventory write-down is necessary. The ASU is effective January 1, 2017, and we do not expect it to have a material effect on our financial position or results of operations. In May 2014, the FASB issued ASU 2014-09 (Topic 606): Revenue from Contracts with Customers . This ASU amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. The ASU implements a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenues and cash flows from contracts with customers. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers - Principal versus Agent Considerations (Reporting revenue gross versus net) , which clarifies gross versus net revenue reporting when another party is involved in the transaction. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers-Identifying Performance Obligations and Licensing , which amends the revenue guidance on identifying performance obligations and accounting for licenses of intellectual property. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers - Narrow-Scope Improvements and Practical Expedients , which provides narrow-scope improvements to the guidance on collectability, non-cash consideration, and completed contracts at transition. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The standard will be effective for reporting periods beginning after December 15, 2017. We are still assessing the impact of ASU 2014-09, but we do not believe it will have a material effect on our financial position or results of operations. There were no other accounting standards recently issued that had or are expected to have a material impact on our financial position or results of operations.
Basis of Accounting and Presentation	These financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with Article 10 of SEC Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete audited financial statements. Operating results for the three and nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . These consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2015 . The consolidated financial statements of PCA as of September 30, 2016 and for the three and nine months ended September 30, 2016 and 2015 are unaudited but include all adjustments (consisting only of normal recurring adjustments) that management considers necessary for a fair presentation of such financial statements
Use of Estimates	The preparation of the consolidated financial statements involves the use of estimates and accruals. Actual results may vary from those estimates.
Consolidation	The consolidated financial statements include the accounts of PCA and its majority-owned subsidiaries after elimination of intercompany balances and transactions.
Inventory Valuation	We value our raw materials, work in process, and finished goods inventories using lower of cost, as determined by the average cost method, or market. Supplies and materials are valued at the first-in, first-out (FIFO) or average cost methods.
Commitments and Legal Proceedings	Legal Proceedings We are party to legal actions arising in the ordinary course of our business. These legal actions include commercial liability claims, premises liability claims, commercial disputes, and employment-related claims, among others. As of the date of this filing, we believe it is not reasonably possible that any of the legal actions against us will, either individually or in the aggregate, have a material adverse effect on our financial condition, results of operations, or cash flows. We have financial commitments and obligations that arise in the ordinary course of our business. These include long-term debt, capital commitments, lease obligations, and purchase commitments for goods and services, and legal proceedings, all of which are discussed in Note 10, Debt, and Note 19, Commitments, Guarantees, Indemnifications, and Legal Proceedings, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K.
Guarantees and Indemnifications	Guarantees and Indemnifications We provide guarantees, indemnifications, and other assurances to third parties in the normal course of our business. These include tort indemnifications, product guarantees, environmental assurances, and representations and warranties in commercial agreements. At September 30, 2016 we are not aware of any material liabilities arising from any guarantee, indemnification, or financial assurance we have provided. If we determined such a liability was probable and subject to reasonable determination, we would accrue for it at that time.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The total purchase price has been preliminarily allocated to tangible and intangible assets acquired and liabilities assumed based on respective fair values, as follows (dollars in millions): Goodwill $ 148.1 Other intangible assets 101.6 Property, plant and equipment 96.9 Other net assets 39.0 Net assets acquired $ 385.6

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Computation of Basic and Diluted Income Per Common Share	The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data): Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Numerator: Net income attributable to Packaging Corporation of America $ 119.3 $ 127.8 $ 338.9 $ 332.6 Less: distributed and undistributed earnings allocated to participating securities (1.1 ) (1.5 ) (3.4 ) (4.0 ) Net income attributable to common shareholders $ 118.2 $ 126.3 $ 335.5 $ 328.6 Denominator: Weighted average basic common shares outstanding 93.4 96.5 93.6 96.8 Effect of dilutive securities 0.2 0.1 0.1 0.1 Weighted average diluted common shares outstanding 93.6 96.6 93.7 96.9 Basic income per common share $ 1.27 $ 1.31 $ 3.59 $ 3.39 Diluted income per common share $ 1.26 $ 1.31 $ 3.58 $ 3.39

Other Income (Expense), Net (Ta

Other Income (Expense), Net (Tables)	9 Months Ended
	Sep. 30, 2016
Other Income and Expenses [Abstract]
Components of Other Expense, Net	The components of other income (expense), net, were as follows (dollars in millions): Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Facilities closure costs (a) $ (1.6 ) $ — $ (5.0 ) $ — Acquisition-related costs (b) (2.0 ) — (2.3 ) — Multiemployer pension withdrawal (c) — — (0.9 ) — Asset disposals and write-offs (0.6 ) (5.0 ) (3.5 ) (9.7 ) Integration-related and other costs (d) — (2.4 ) — (9.0 ) Sale of St. Helens paper mill site (e) — 6.7 — 6.7 DeRidder restructuring (f) — 3.8 — 3.6 Refundable state tax credit (g) — — — 3.6 Other (2.0 ) 0.7 (3.5 ) 1.9 Total $ (6.2 ) $ 3.8 $ (15.2 ) $ (2.9 ) ___________ (a) The three and nine months ended September 30, 2016 include facilities closure costs related to corrugated products facilities and a paper products facility. (b) The three and nine months ended September 30, 2016 include acquisition-related costs for the TimBar Corporation acquisition. (c) The nine months ended September 30, 2016 include costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities. (d) The three and nine months ended September 30, 2015 include Boise acquisition integration-related and other costs. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs. (e) The three and nine months ended September 30, 2015 include a gain on the sale of the paper mill site in St. Helens, Oregon, where we ceased paper production in December 2012. (f) The three and nine months ended September 30, 2015 include amounts from restructuring activities at our mill in DeRidder, Louisiana. (g) The nine months ended September 30, 2015 include a tax credit from the State of Louisiana related to our capital investment and the jobs retained at the DeRidder, Louisiana mill.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Components of Inventories	The components of inventories were as follows (dollars in millions): September 30, December 31, Raw materials $ 259.8 $ 260.6 Work in process 14.9 14.2 Finished goods 188.0 189.7 Supplies and materials 227.9 212.3 Inventories $ 690.6 $ 676.8

Property, Plant, and Equipment

Property, Plant, and Equipment (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Components of Property, Plant, and Equipment	The components of property, plant, and equipment were as follows (dollars in millions): September 30, December 31, Land and land improvements $ 148.6 $ 146.4 Buildings 687.8 640.9 Machinery and equipment 4,902.2 4,747.1 Construction in progress 151.2 119.1 Other 62.6 61.3 Property, plant, and equipment, at cost 5,952.4 5,714.8 Less accumulated depreciation (3,073.7 ) (2,882.7 ) Property, plant, and equipment, net $ 2,878.7 $ 2,832.1

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying amount of our goodwill are as follows (dollars in millions): Goodwill Balance at December 31, 2015 $ 544.0 Acquisition (a) 148.1 Balance at September 30, 2016 $ 692.1 ___________ (a) In connection with the August 2016 acquisition of TimBar Corporation (TimBar), the Company recorded $148.1 million of goodwill in the Packaging segment.
Components of Intangible Assets	The weighted average remaining useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions): September 30, 2016 December 31, 2015 Weighted Average Remaining Useful Life (in Years) Gross Accumulated Weighted Average Remaining Useful Life (in Years) Gross Accumulated Customer relationships (b) 13.3 $ 408.0 $ 73.2 13.3 $ 311.5 $ 57.3 Trademarks and trade names (b) 11.7 25.6 6.9 13.6 21.8 5.2 Other (b) 2.9 1.5 0.2 1.2 0.2 0.2 Total intangible assets (excluding goodwill) 13.2 $ 435.1 $ 80.3 13.6 $ 333.5 $ 62.7

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 30, 2016
Accrued Liabilities [Abstract]
Components of Accrued Liabilities	The components of accrued liabilities were as follows (dollars in millions): September 30, December 31, Compensation and benefits $ 114.7 $ 106.4 Medical insurance and workers’ compensation 32.0 31.1 Franchise, property, and sales and use taxes 19.4 16.0 Customer volume discounts and rebates 20.1 15.3 Environmental liabilities and asset retirement obligations 7.1 7.9 Severance, retention, and relocation 3.3 7.3 Other 8.3 9.5 Total $ 204.9 $ 193.5

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	At September 30, 2016 and December 31, 2015, our long-term debt and interest rates on that debt were as follows (dollars in millions): September 30, 2016 December 31, 2015 Amount Interest Rate Amount Interest Rate Revolving Credit Facility, due October 2018 $ — — % $ — — % Revolving Credit Facility, due August 2021 — — — — Five-Year Term Loan, due October 2018 — — 25.0 1.80 Five-Year Term Loan, due August 2021 385.0 1.77 — — Seven-Year Term Loan, due October 2020 632.1 2.15 637.0 2.05 6.50% Senior Notes due March 2018 150.0 6.50 150.0 6.50 3.90% Senior Notes, net of discounts of $0.2 million and $0.3 million as of September 30, 2016 and December 31, 2015, due June 2022 399.8 3.90 399.7 3.90 4.50% Senior Notes, net of discount of $1.4 million and $1.5 million as of September 30, 2016 and December 31, 2015, due November 2023 698.6 4.50 698.5 4.50 3.65% Senior Notes, net of discount of $0.9 million and $1.0 million as of September 30, 2016 and December 31, 2015, due September 2024 399.1 3.65 399.0 3.65 Total 2,664.6 3.44 % 2,309.2 3.67 % Less current portion 25.8 6.5 Less unamortized debt issuance costs 13.0 12.3 Total long-term debt $ 2,625.8 $ 2,290.4

Employee Benefit Plans and Ot35

Employee Benefit Plans and Other Postretirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Components of Net Periodic Benefit Costs	The components of net periodic benefit cost for our pension plans were as follows (dollars in millions): Pension Plans Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Service cost $ 6.2 $ 6.1 $ 18.4 $ 17.9 Interest cost 10.2 11.6 30.6 34.6 Expected return on plan assets (12.3 ) (13.3 ) (37.1 ) (39.8 ) Net amortization of unrecognized amounts Prior service cost 1.4 1.4 4.3 4.2 Actuarial loss 1.5 2.1 4.3 6.4 Net periodic benefit cost $ 7.0 $ 7.9 $ 20.5 $ 23.3 The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions): Postretirement Plans Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Service cost $ 0.1 $ 0.4 $ 0.5 $ 1.3 Interest cost 0.1 0.3 0.5 0.9 Net amortization of unrecognized amounts Prior service cost (0.1 ) — (0.1 ) — Actuarial (income) loss — — (0.4 ) 0.1 Net periodic benefit cost $ 0.1 $ 0.7 $ 0.5 $ 2.3

Share-based Compensation (Table

Share-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2016
Share-based Compensation [Abstract]
Summary of Restricted Stock and Performance Unit Award Activity	The following table presents restricted stock and performance unit award activity for the nine months ended September 30, 2016 : Restricted Stock Performance Units Shares Weighted Average Grant- Date Fair Value Shares Weighted Average Grant- Date Fair Value Outstanding at January 1, 2016 1,007,794 $ 49.47 175,675 $ 59.94 Granted 242,835 67.48 77,017 67.57 Vested (a) (417,544 ) 33.19 (20,604 ) 57.58 Forfeitures (18,233 ) 58.72 — — Outstanding at September 30, 2016 814,852 $ 62.98 232,088 $ 62.68 ___________ (a) Upon vesting of the performance unit awards, PCA issued 21,111 shares of its common stock, which included 507 shares for dividends accrued during the vesting period.
Compensation Expense for Restricted Stock and Performance Units	Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures, was as follows (dollars in millions): Three Months Ended September 30 Nine Months Ended September 30 2016 2015 2016 2015 Restricted stock $ 3.5 $ 3.7 $ 12.2 $ 11.7 Performance units 1.3 0.9 2.8 2.0 Total share-based compensation expense 4.8 4.6 15.0 13.7 Income tax benefit (1.8 ) (1.8 ) (5.8 ) (5.3 ) Share-based compensation expense, net of tax benefit $ 3.0 $ 2.8 $ 9.2 $ 8.4
Unrecognized Compensation For Restricted Stock and Performance Units	The unrecognized compensation expense for all share-based awards at September 30, 2016 was as follows (dollars in millions): September 30, 2016 Unrecognized Compensation Expense Remaining Weighted Average Recognition Period (in years) Restricted stock $ 30.7 2.9 Performance units 9.1 3.0 Total unrecognized share-based compensation expense $ 39.8 2.9

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Components of Changes in Accumulated Other Comprehensive Income (AOCI)	Changes in accumulated other comprehensive income (loss) (AOCI) by component were as follows. Amounts in parentheses indicate losses (dollars in millions): Unrealized Loss On Treasury Locks, Net Unrealized Loss on Foreign Exchange Contracts Unfunded Employee Benefit Obligations Total Balance at January 1, 2016 $ (21.2 ) $ (0.4 ) $ (103.3 ) $ (124.9 ) Other comprehensive income (loss) before reclassifications, net of tax — — 3.1 3.1 Amounts reclassified from AOCI, net of tax 2.6 (a) — 5.0 (b) 7.6 Balance at September 30, 2016 $ (18.6 ) $ (0.4 ) $ (95.2 ) $ (114.2 )
Reclassifications Out of Accumulated Other Comprehensive Income (AOCI)	Reclassifications out of AOCI were as follows. Amounts in parentheses indicate expenses in the Consolidated Statements of Income (dollars in millions): Amounts Reclassified from AOCI Three Months Ended September 30 Nine Months Ended September 30 Affected Line Item in the Statement Where Net Income is Presented Details about AOCI Components 2016 2015 2016 2015 Foreign currency translation adjustments $ — $ — $ — $ (4.2 ) Other expense, net — — — — Tax benefit $ — $ — $ — $ (4.2 ) Net of tax Unrealized loss on treasury locks, net $ (1.4 ) $ (1.4 ) $ (4.2 ) $ (4.2 ) See (a) below 0.5 0.5 1.6 1.6 Tax benefit $ (0.9 ) $ (0.9 ) $ (2.6 ) $ (2.6 ) Net of tax Unfunded employee benefit obligations Amortization of prior service costs $ (1.3 ) $ (1.4 ) $ (4.2 ) $ (4.2 ) See (b) below Amortization of actuarial losses (1.5 ) (2.1 ) (3.9 ) (6.5 ) See (b) below (2.8 ) (3.5 ) (8.1 ) (10.7 ) Total before tax 1.0 1.4 3.1 4.2 Tax benefit $ (1.8 ) $ (2.1 ) $ (5.0 ) $ (6.5 ) Net of tax ____________ (a) This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ( $3.5 million after tax). For a discussion of treasury lock derivative instrument activity, see Note 14, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K. (b) These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 11 , Employee Benefit Plans and Other Postretirement Benefits , for additional information.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Selected Financial Information by Reportable Segment	Selected financial information by reportable segment was as follows (dollars in millions): Sales, net Operating Income (Loss) Three Months Ended September 30, 2016 Trade Inter-segment Total Packaging $ 1,165.0 $ 2.1 $ 1,167.1 $ 179.6 (a) Paper 292.8 — 292.8 44.5 (a) Corporate and Other 26.2 36.7 62.9 (17.7 ) Intersegment eliminations — (38.8 ) (38.8 ) — $ 1,484.0 $ — $ 1,484.0 206.4 Interest expense, net (23.4 ) Income before taxes $ 183.0 Sales, net Operating Income (Loss) Three Months Ended September 30, 2015 Trade Inter-segment Total Packaging $ 1,144.0 $ 0.4 $ 1,144.4 $ 198.2 (b) Paper 291.9 — 291.9 39.5 (c) Corporate and Other 34.9 36.3 71.2 (18.3 ) (d) Intersegment eliminations — (36.7 ) (36.7 ) — $ 1,470.8 $ — $ 1,470.8 219.4 Interest expense, net (21.7 ) Income before taxes $ 197.7 Sales, net Operating Income (Loss) Nine Months Ended September 30, 2016 Trade Inter-segment Total Packaging $ 3,382.4 $ 5.5 $ 3,387.9 $ 533.5 (a) Paper 840.1 — 840.1 105.0 (a) Corporate and Other 79.9 105.7 185.6 (51.1 ) (a) Intersegment eliminations — (111.2 ) (111.2 ) — $ 4,302.4 $ — $ 4,302.4 587.4 Interest expense (67.5 ) Income before taxes $ 519.9 Sales, net Operating Income (Loss) Nine Months Ended September 30, 2015 Trade Inter-segment Total Packaging $ 3,382.8 $ 3.1 $ 3,385.9 $ 533.9 (b) Paper 870.3 — 870.3 98.6 (c) Corporate and Other 97.7 101.0 198.7 (58.4 ) (d) Intersegment eliminations — (104.0 ) (104.0 ) — $ 4,350.8 $ — $ 4,350.8 574.1 Interest expense (63.2 ) Income before taxes $ 510.9 ___________ (a) The three and nine months ended September 30, 2016 include $2.0 million and $6.5 million , respectively, of closure costs related to corrugated products facilities and a paper products facility. The closure costs are recorded within "Other income (expense), net" and "Cost of sales", as appropriate. The three and nine months ended September 30, 2016 include $2.9 million and $3.2 million of acquisition-related costs for the TimBar Corporation acquisition, which we recorded in "Other income (expense), net". The nine months ended September 30, 2016 include $0.9 million of costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities. (b) The three and nine months ended September 30, 2015 include $3.8 million of income and $5.4 million of expense, respectively, related to restructuring charges at our mill in DeRidder, Louisiana, which were recorded in "Other income (expense), net" and "Cost of sales", as appropriate. The nine months ended September 30, 2015 include $2.7 million of Boise acquisition integration-related and other costs, respectively. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs, and are mostly recorded in "Other income (expense), net". (c) 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, in "Other income (expense), net". (d) The three and nine months ended September 30, 2015 include $2.4 million and $6.9 million , respectively, of Boise acquisition integration-related and other costs, mostly recorded in "Other income (expense), net".

Nature of Operations and Basi39

Nature of Operations and Basis of Presentation - Additional Information (Details) ton in Millions	1 Months Ended	9 Months Ended
	Oct. 31, 2016ton	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments		3
Subsequent Event | Wallula, Washington Mill
Subsequent Event [Line Items]
Pulp capacity (in tons)	0.1

Acquisitions (Details)

Acquisitions (Details) $ in Millions	Aug. 29, 2016USD ($)facility
TimBar Corporation
Business Acquisition [Line Items]
Number of corrugated products production facilities acquired | facility	6
Cash purchase price	$ 386
Debt instrument, face amount	$ 385
Debt instrument, term	5 years
Acquired finite-lived intangible assets, weighted average useful life	14 years 5 months 24 days
Wholesale Distributor
Business Acquisition [Line Items]
Percent of interest acquired	51.00%
Minimum | TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life	2 years
Maximum | TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life	24 years

Acquisitions - Schedule of Acqu

Acquisitions - Schedule of Acquisitions (Details) - USD ($)	Sep. 30, 2016	Aug. 29, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 692,100,000		$ 544,000,000
TimBar Corporation
Business Acquisition [Line Items]
Goodwill		$ 148,100
Other intangible assets		101,600
Property, plant and equipment		96,900
Other net assets		39,000
Net assets acquired		$ 385,600

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 119.3	$ 127.8	$ 338.9	$ 332.6
Less: distributed and undistributed earnings allocated to participating securities	(1.1)	(1.5)	(3.4)	(4)
Net income attributable to common shareholders	$ 118.2	$ 126.3	$ 335.5	$ 328.6
Denominator:
Weighted average basic common shares outstanding (in shares)	93.4	96.5	93.6	96.8
Effect of dilutive securities (in shares)	0.2	0.1	0.1	0.1
Weighted average diluted common shares outstanding (in shares)	93.6	96.6	93.7	96.9
Basic income per common share (in dollars per share)	$ 1.27	$ 1.31	$ 3.59	$ 3.39
Diluted income per common share (in dollars per share)	$ 1.26	$ 1.31	$ 3.58	$ 3.39

Other Income (Expense), Net (De

Other Income (Expense), Net (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income and Expenses [Abstract]
Facilities closure costs and other	[1]	$ (1.6)	$ 0	$ (5)	$ 0
Acquisition-related costs	[2]	(2)	0	(2.3)	0
Multiemployer pension withdrawal	[3]	0	0	(0.9)	0
Asset disposals and write-offs		(0.6)	(5)	(3.5)	(9.7)
Integration-related and other costs	[4]	0	(2.4)	0	(9)
Sale of St. Helens paper mill site	[5]	0	6.7	0	6.7
DeRidder restructuring	[6]	0	3.8	0	3.6
Refundable state tax credit	[7]	0	0	0	3.6
Other		(2)	0.7	(3.5)	1.9
Other income (expense), net		$ (6.2)	$ 3.8	$ (15.2)	$ (2.9)
[1]	The three and nine months ended September 30, 2016 include facilities closure costs related to corrugated products facilities and a paper products facility.
[2]	The three and nine months ended September 30, 2016 include acquisition-related costs for the TimBar Corporation acquisition.
[3]	The nine months ended September 30, 2016 include costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities.
[4]	The three and nine months ended September 30, 2015 include Boise acquisition integration-related and other costs. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs.
[5]	The three and nine months ended September 30, 2015 include a gain on the sale of the paper mill site in St. Helens, Oregon, where we ceased paper production in December 2012.
[6]	The three and nine months ended September 30, 2015 include amounts from restructuring activities at our mill in DeRidder, Louisiana.
[7]	The nine months ended September 30, 2015 include a tax credit from the State of Louisiana related to our capital investment and the jobs retained at the DeRidder, Louisiana mill.

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax provision	$ 63.7	$ 69.9	$ 181	$ 178.3
Effective income tax rate, percent	34.80%	35.40%	34.80%	34.90%
Effective income tax rate, at federal statutory income tax rate, percent	35.00%	35.00%	35.00%	35.00%
Cash paid for taxes, net of refunds received			$ 158.8	$ 163.7

Inventories - Components of Inv

Inventories - Components of Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 259.8	$ 260.6
Work in process	14.9	14.2
Finished goods	188	189.7
Supplies and materials	227.9	212.3
Inventories	$ 690.6	$ 676.8

Property, Plant, and Equipmen46

Property, Plant, and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, at cost	$ 5,952.4		$ 5,952.4		$ 5,714.8
Less accumulated depreciation	(3,073.7)		(3,073.7)		(2,882.7)
Property, plant, and equipment, net	2,878.7		2,878.7		2,832.1
Depreciation [Abstract]
Depreciation expense	79.9	$ 79.6	240.5	$ 243.5
Incremental depreciation expense			0.8	$ 9
Purchases of property, plant, and equipment included in accounts payable			20.1		15
Land and Land Improvements
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, at cost	148.6		148.6		146.4
Buildings
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, at cost	687.8		687.8		640.9
Machinery and Equipment
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, at cost	4,902.2		4,902.2		4,747.1
Construction in Progress
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, at cost	151.2		151.2		119.1
Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment, at cost	$ 62.6		$ 62.6		$ 61.3

Goodwill and Intangible Asset47

Goodwill and Intangible Assets - Goodwill (Details) - USD ($)		9 Months Ended
		Sep. 30, 2016	Aug. 29, 2016
Goodwill [Roll Forward]
Balance at December 31, 2015		$ 692,100,000
Acquisition	[1]	148,100,000
Balance at September 30, 2016		544,000,000
Goodwill		544,000,000
Packaging
Goodwill [Roll Forward]
Balance at December 31, 2015		636,900,000
Balance at September 30, 2016		488,800,000
Goodwill		488,800,000
Paper
Goodwill [Roll Forward]
Balance at December 31, 2015		55,200,000
Balance at September 30, 2016		55,200,000
Goodwill		$ 55,200,000
TimBar Corporation
Goodwill [Roll Forward]
Goodwill			$ 148,100
TimBar Corporation | Packaging
Goodwill [Roll Forward]
Goodwill			$ 148,100,000
[1]	In connection with the August 2016 acquisition of TimBar Corporation (TimBar), the Company recorded $148.1 million of goodwill in the Packaging segment.

Goodwill and Intangible Asset48

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)				13 years 2 months 30 days		13 years 6 months 40 days
Gross Carrying Amount		$ 435.1		$ 435.1		$ 333.5
Accumulated Amortization		80.3		80.3		$ 62.7
Intangible assets amortization expense		6.3	$ 5.7	$ 17.5	$ 17.1
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)				13 years 3 months 30 days		13 years 4 months
Gross Carrying Amount		408		$ 408		$ 311.5
Accumulated Amortization		73.2		$ 73.2		$ 57.3
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)				11 years 8 months		13 years 6 months 33 days
Gross Carrying Amount		25.6		$ 25.6		$ 21.8
Accumulated Amortization		6.9		$ 6.9		$ 5.2
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)				2 years 10 months 30 days		1 year 2 months 12 days
Gross Carrying Amount		1.5		$ 1.5		$ 0.2
Accumulated Amortization		$ 0.2		$ 0.2		$ 0.2
TimBar Corporation | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 96.5
TimBar Corporation | Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	3.8
TimBar Corporation | Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 1.3

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Accrued Liabilities [Abstract]
Compensation and benefits	$ 114.7	$ 106.4
Medical insurance and workers’ compensation	32	31.1
Franchise, property, and sales and use taxes	19.4	16
Customer volume discounts and rebates	20.1	15.3
Environmental liabilities and asset retirement obligations	7.1	7.9
Severance, retention, and relocation	3.3	7.3
Other	8.3	9.5
Total	$ 204.9	$ 193.5

Debt - Schedule of Long-term De

Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Aug. 29, 2016	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt		$ 2,664.6	$ 2,309.2
Less current portion		25.8	6.5
Less unamortized debt issuance costs		13	12.3
Long-term debt		$ 2,625.8	$ 2,290.4
Weighted-average interest rate (as a percent)		3.44%	3.67%
Line of Credit | Revolving Credit Facility, due October 2018
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 0
Stated interest rate (as a percent)		0.00%	0.00%
Line of Credit | Revolving Credit Facility, due August 2021
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 0
Stated interest rate (as a percent)		0.00%	0.00%
Unsecured Debt | Five-Year Term Loan, due October 2018
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 25
Stated interest rate (as a percent)		0.00%	1.80%
Debt instrument, term		5 years
Unsecured Debt | Five-Year Term Loan, due August 2021
Debt Instrument [Line Items]
Long-term debt		$ 385	$ 0
Stated interest rate (as a percent)		1.77%	0.00%
Debt instrument, term	5 years	5 years
Unsecured Debt | Seven-Year Term Loan, due October 2020
Debt Instrument [Line Items]
Long-term debt	$ 633.7	$ 632.1	$ 637
Stated interest rate (as a percent)		2.15%	2.05%
Debt instrument, term	7 years	7 years
Senior Notes | 6.50% Senior Notes due March 2018
Debt Instrument [Line Items]
Long-term debt		$ 150	$ 150
Stated interest rate (as a percent)		6.50%	6.50%
Senior Notes | 3.90% Senior Notes, Due June 2022
Debt Instrument [Line Items]
Long-term debt		$ 399.8	$ 399.7
Debt instrument, unamortized discount		$ 0.2	$ 0.3
Stated interest rate (as a percent)		3.90%	3.90%
Senior Notes | 4.50% Senior Notes, Due November 2023
Debt Instrument [Line Items]
Long-term debt		$ 698.6	$ 698.5
Debt instrument, unamortized discount		$ 1.4	$ 1.5
Stated interest rate (as a percent)		4.50%	4.50%
Senior Notes | 3.65% Senior Notes, due September 2024
Debt Instrument [Line Items]
Long-term debt		$ 399.1	$ 399
Debt instrument, unamortized discount		$ 0.9	$ 1
Stated interest rate (as a percent)		3.65%	3.65%

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($) $ in Millions	Aug. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt		$ 2,664.6		$ 2,664.6		$ 2,309.2
Cash payments paid for interest				59.5	$ 58.6
Amortization of treasury lock settlements			$ 1.4	4.2	4.2
Amortization of deferred financing costs		0.5	$ 0.5	$ 1.4	1.3
Five Year Credit Agreement
Debt Instrument [Line Items]
Debt instrument, term	5 years
Unsecured Debt | Five-Year Term Loan, due August 2021
Debt Instrument [Line Items]
Debt instrument, face amount	$ 385
Debt instrument, term	5 years			5 years
Long-term debt		385		$ 385		0
Unsecured Debt | Seven-Year Term Loan, due October 2020
Debt Instrument [Line Items]
Debt instrument, face amount	$ 650
Debt instrument, term	7 years			7 years
Repayment of debt				$ 4.9	4.9
Long-term debt	$ 633.7	632.1		$ 632.1		637
Unsecured Debt | Five-Year Term Loan, due October 2018
Debt Instrument [Line Items]
Debt instrument, term				5 years
Repayment of debt				$ 25	$ 25
Long-term debt		0		0		25
Line of Credit | Revolving Credit Facility, due August 2021
Debt Instrument [Line Items]
Debt instrument, face amount	$ 350
Letters of credit outstanding		25		25
Long-term debt		0		0		$ 0
Senior Notes | Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Book value of fixed rate debt		1,647.5		1,647.5
Long-term debt (fixed-rate debt), fair value		1,767.1		1,767.1
Term Loan | Variable-Rate Term Loans
Debt Instrument [Line Items]
Book value of variable rate debt		$ 1,017.1		$ 1,017.1

Employee Benefit Plans and Ot52

Employee Benefit Plans and Other Postretirement Benefits (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Apr. 30, 2016	Dec. 31, 2015
Pension Contributions [Abstract]
Increase in accumulated other comprehensive income (loss)	$ (114,200,000)		$ (114,200,000)			$ (124,900,000)
Postretirement Health Coverage | Adjustment
Pension Contributions [Abstract]
Decrease in benefit obligation					$ 5,100,000
Increase in accumulated other comprehensive income (loss)					3,100,000
Increase in deferred income taxes					$ 2,000,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6,200,000	$ 6,100,000	18,400,000	$ 17,900,000
Interest cost	10,200,000	11,600,000	30,600,000	34,600,000
Expected return on plan assets	(12,300,000)	(13,300,000)	(37,100,000)	(39,800,000)
Net amortization of unrecognized amounts, Prior service cost	1,400,000	1,400,000	4,300,000	4,200,000
Net amortization of unrecognized amounts, Actuarial loss	1,500,000	2,100,000	4,300,000	6,400,000
Net periodic benefit cost	7,000,000	7,900,000	20,500,000	23,300,000
Pension Contributions [Abstract]
Contributions to pension plan	49,700,000	0	53,000,000	0
Minimum pension contributions			27,000,000
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	100,000	400,000	500,000	1,300,000
Interest cost	100,000	300,000	500,000	900,000
Net amortization of unrecognized amounts, Prior service cost	(100,000)	0	(100,000)	0
Net amortization of unrecognized amounts, Actuarial loss	0	0	(400,000)	100,000
Net periodic benefit cost	$ 100,000	$ 700,000	$ 500,000	$ 2,300,000

Share-based Compensation - Addi

Share-based Compensation - Additional Information (Details) shares in Millions	9 Months Ended
	Sep. 30, 2016shares
Share-based Compensation [Abstract]
Long-term equity incentive plan, termination date	May 1, 2023
Number of shares authorized under plan	10.6
Number of shares available for future issuance under share-based plan	1.2

Share-based Compensation - Summ

Share-based Compensation - Summary of Restricted Stock and Performance Unit Award Activity (Details)	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Restricted Stock
Restricted stock and performance unit award activity (shares) [Roll Forward]
Outstanding at January 1, 2016	1,007,794
Granted	242,835
Vested	(417,544)
Forfeitures	(18,233)
Outstanding at September 30, 2016	814,852
Restricted stock and performance unit award activity (weighted average grant-date fair value) [Abstract]
Weighted average grant-date fair value of outstanding shares at January 1, 2016 | $ / shares	$ 49.47
Weighted average grant-date fair value of shares granted | $ / shares	67.48
Weighted average grant-date fair value of shares vested | $ / shares	33.19
Weighted average grant-date fair value of shares forfeitures | $ / shares	58.72
Weighted average grant-date fair value of outstanding shares at March 31, 2016 | $ / shares	$ 62.98
Performance Units
Restricted stock and performance unit award activity (shares) [Roll Forward]
Outstanding at January 1, 2016	175,675
Granted	77,017
Vested	(20,604)
Forfeitures	0
Outstanding at September 30, 2016	232,088
Restricted stock and performance unit award activity (weighted average grant-date fair value) [Abstract]
Weighted average grant-date fair value of outstanding shares at January 1, 2016 | $ / shares	$ 59.94
Weighted average grant-date fair value of shares granted | $ / shares	67.57
Weighted average grant-date fair value of shares vested | $ / shares	57.58
Weighted average grant-date fair value of shares forfeitures | $ / shares	0
Weighted average grant-date fair value of outstanding shares at March 31, 2016 | $ / shares	$ 62.68
Common stock issued upon vesting of award (in shares)	21,111
Common stock issued for dividends accrued (in shares)	507

Share-based Compensation - Comp

Share-based Compensation - Compensation Expense for Restricted Stock and Performance Units (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 4.8	$ 4.6	$ 15	$ 13.7
Income tax benefit	(1.8)	(1.8)	(5.8)	(5.3)
Share-based compensation expense, net of tax benefit	3	2.8	9.2	8.4
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	3.5	3.7	12.2	11.7
Performance Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 1.3	$ 0.9	$ 2.8	$ 2

Share-based Compensation - Unre

Share-based Compensation - Unrecognized Compensation Expense for Share-Based Awards (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 39.8
Remaining weighted-average recognition period	2 years 10 months 31 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 30.7
Remaining weighted-average recognition period	2 years 10 months 30 days
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 9.1
Remaining weighted-average recognition period	3 years

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 14, 2016	Aug. 31, 2016	Aug. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Feb. 25, 2016
Common stock dividends paid						$ 156.7	$ 147.3
Dividends declared per common share (in dollars per share)		$ 2.52	$ 2.20	$ 0.63	$ 0.55	$ 1.73	$ 1.65
Stock repurchase program, authorized amount								$ 200
Repurchases of common stock						$ 100.3	$ 98.1
Shares of common stock repurchased						1,987,187
Subsequent Event
Common stock dividends paid	$ 59.4
Dividends paid per common share (in dollars per share)	$ 0.63

Stockholders' Equity - Changes

Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at January 1, 2016	$ (124.9)
Other comprehensive income (loss) before reclassifications, net of tax	3.1
Amounts reclassified from AOCI, net of tax	7.6
Balance at September 30, 2016	(114.2)
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax	(5.7)
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax	(3.5)
Unfunded Employee Benefit Obligations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at January 1, 2016	(103.3)
Other comprehensive income (loss) before reclassifications, net of tax	3.1
Amounts reclassified from AOCI, net of tax	5	[1]
Balance at September 30, 2016	(95.2)
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at January 1, 2016	(21.2)
Other comprehensive income (loss) before reclassifications, net of tax	0
Amounts reclassified from AOCI, net of tax	2.6	[2]
Balance at September 30, 2016	(18.6)
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at January 1, 2016	(0.4)
Other comprehensive income (loss) before reclassifications, net of tax	0
Amounts reclassified from AOCI, net of tax	0
Balance at September 30, 2016	$ (0.4)
[1]	These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 11, Employee Benefit Plans and Other Postretirement Benefits, for additional information.
[2]	This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ($3.5 million after tax). For a discussion of treasury lock derivative instrument activity, see Note 14, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K.

Stockholders' Equity - Reclassi

Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net		$ (2)		$ 0.7		$ (3.5)	$ 1.9
Interest expense, net		(23.4)		(21.7)		(67.5)	(63.2)
Income before taxes		183		197.7		519.9	510.9
Income tax benefit		(63.7)		(69.9)		(181)	(178.3)
Net income		119.3		127.8		338.9	332.6
Accumulated Foreign Currency Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit		0		0		0	0
Net income		0		0		0	(4.2)
Accumulated Foreign Currency Adjustment Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net		0		0		0	(4.2)
Unfunded Employee Benefit Obligations | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service costs		(1.3)	[1]	(1.4)	[1]	(4.2)	(4.2)
Amortization of actuarial losses		(1.5)	[1]	(2.1)	[1]	(3.9)	(6.5)
Income before taxes		(2.8)		(3.5)		(8.1)	(10.7)
Income tax benefit		1		1.4		3.1	4.2
Net income		(1.8)		(2.1)		(5)	(6.5)
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	[2]	(1.4)		(1.4)		(4.2)	(4.2)
Income tax benefit		0.5		0.5		1.6	1.6
Net income		$ (0.9)		$ (0.9)		$ (2.6)	$ (2.6)
[1]	These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 11, Employee Benefit Plans and Other Postretirement Benefits, for additional information.
[2]	This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ($3.5 million after tax). For a discussion of treasury lock derivative instrument activity, see Note 14, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K.

Concentrations of Risk (Details

Concentrations of Risk (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Accounts receivable, net, current		$ 713.2	$ 636.5
Office Depot (including OfficeMax) | Credit Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net, current		$ 31.6	$ 39.5
Office Depot (including OfficeMax) | Total Company Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	8.00%
Office Depot (including OfficeMax) | Total Company Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		4.00%	6.00%
Paper | Office Depot (including OfficeMax) | Paper Segment Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%	41.00%	45.00%

Transactions With Related Par61

Transactions With Related Parties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 5.1		$ 5.1		$ 4.5
Carrying amount of LTP's liabilities	5.1		$ 5.1		$ 4.5
Boise Cascade Co-Owner of LTP
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage			50.00%
Boise Cascade Co-Owner of LTP | Fiber
Related Party Transaction [Line Items]
Revenue from related parties	15.5	$ 25.2	$ 54.8	$ 70.3
Fiber costs from related parties	$ 3.9	$ 5	$ 13.2	$ 16.3
PCA
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage			50.00%

Segment Information (Details)

Segment Information (Details) $ in Millions		1 Months Ended	3 Months Ended				9 Months Ended
		Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)		Sep. 30, 2015USD ($)		Sep. 30, 2016USD ($)		Sep. 30, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments							3
Trade sales			$ 1,484		$ 1,470.8		$ 4,302.4		$ 4,350.8
Net sales			1,484		1,470.8		4,302.4		4,350.8
Operating income (loss)			206.4		219.4		587.4		574.1
Interest expense, net			(23.4)		(21.7)		(67.5)		(63.2)
Income before taxes			183		197.7		519.9		510.9
Facilities closure costs and other	[1]		1.6		0		5		0
Acquisition-related costs	[2]		2		0		2.3		0
Costs related to withdrawal from multiemployer pension plan	[3]		0		0		0.9		0
Integration-related and other costs	[4]		0		2.4		0		9
Asset disposals and write-offs			(0.6)		(5)		(3.5)		(9.7)
Packaging
Segment Reporting Information [Line Items]
Trade sales			1,165		1,144		3,382.4		3,382.8
Operating income (loss)			179.6	[5]	198.2	[6]	533.5	[5]	533.9	[6]
Paper
Segment Reporting Information [Line Items]
Trade sales			292.8		291.9		840.1		870.3
Operating income (loss)			44.5	[5]	39.5		105	[5]	98.6
Corporate and Other
Segment Reporting Information [Line Items]
Trade sales			26.2		34.9		79.9		97.7
Operating income (loss)			(17.7)		(18.3)	[7]	(51.1)		(58.4)	[7]
Intersegment Eliminations
Segment Reporting Information [Line Items]
Intersegment sales			0		0		0		0
Intersegment Eliminations | Packaging
Segment Reporting Information [Line Items]
Intersegment sales			2.1		0.4		5.5		3.1
Intersegment Eliminations | Paper
Segment Reporting Information [Line Items]
Intersegment sales			0		0		0		0
Intersegment Eliminations | Corporate and Other
Segment Reporting Information [Line Items]
Intersegment sales			36.7		36.3		105.7		101
Operating Segments
Segment Reporting Information [Line Items]
Net sales			1,484		1,470.8		4,302.4		4,350.8
Operating Segments | Packaging
Segment Reporting Information [Line Items]
Net sales			1,167.1		1,144.4		3,387.9		3,385.9
Operating Segments | Paper
Segment Reporting Information [Line Items]
Net sales			292.8		291.9		840.1		870.3
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Net sales			62.9		71.2		185.6		198.7
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intersegment sales			(38.8)		(36.7)		(111.2)		(104)
Net sales			(38.8)		(36.7)		(111.2)		(104)
Other Expense and Cost of Sales
Segment Reporting Information [Line Items]
Facilities closure costs and other			2				6.5
Other Expense and Cost of Sales | Restructuring Charges
Segment Reporting Information [Line Items]
Operating income (loss)					3.8				(5.4)
Other Expense, Net
Segment Reporting Information [Line Items]
Costs related to withdrawal from multiemployer pension plan	[3]		0.9
Other Expense, Net | Integration-Related and Other Costs
Segment Reporting Information [Line Items]
Integration-related and other costs					$ 2.4				6.9
TimBar Corporation | Other Expense, Net
Segment Reporting Information [Line Items]
Acquisition-related costs			$ 2.9				$ 3.2
Boise Acquisition | Other Expense, Net | Integration-Related and Other Costs
Segment Reporting Information [Line Items]
Integration-related and other costs									$ 2.7
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Expense, Net
Segment Reporting Information [Line Items]
Asset disposals and write-offs		$ 6.7
[1]	The three and nine months ended September 30, 2016 include facilities closure costs related to corrugated products facilities and a paper products facility.
[2]	The three and nine months ended September 30, 2016 include acquisition-related costs for the TimBar Corporation acquisition.
[3]	The nine months ended September 30, 2016 include costs related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities.
[4]	The three and nine months ended September 30, 2015 include Boise acquisition integration-related and other costs. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs.
[5]	The three and nine months ended September 30, 2016 include $2.0 million and $6.5 million, respectively, of closure costs related to corrugated products facilities and a paper products facility. The closure costs are recorded within "Other income (expense), net" and "Cost of sales", as appropriate.
[6]	The three and nine months ended September 30, 2015 include $3.8 million of income and $5.4 million of expense, respectively, related to restructuring charges at our mill in DeRidder, Louisiana, which were recorded in "Other income (expense), net" and "Cost of sales", as appropriate.The nine months ended September 30, 2015 include $2.7 million of Boise acquisition integration-related and other costs, respectively. These costs primarily relate to professional fees, severance, retention, relocation, travel, and other integration-related costs, and are mostly recorded in "Other income (expense), net".
[7]	The three and nine months ended September 30, 2015 include $2.4 million and $6.9 million, respectively, of Boise acquisition integration-related and other costs, mostly recorded in "Other income (expense), net".

New and Recently Adopted Acco63

New and Recently Adopted Accounting Standards (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less unamortized debt issuance costs	$ 13	$ 12.3
Other Long-term Assets | Adjustments for ASU 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less unamortized debt issuance costs		$ (12.3)

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event ton in Millions, $ in Millions	Oct. 11, 2016USD ($)Fulfillment_center	Oct. 31, 2016ton
Subsequent Event [Line Items]
Number of fulfillment centers | Fulfillment_center	5
Columbus Container Inc
Subsequent Event [Line Items]
Cash purchase price | $	$ 100
Wallula, Washington Mill
Subsequent Event [Line Items]
Pulp capacity (in tons) | ton		0.1