10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2020

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM                      TO                     

Commission file number 1-15399

(Exact Name of Registrant as Specified in its Charter)

Delaware	36-4277050
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
1 North Field Court, Lake Forest, Illinois	60045
(Address of Principal Executive Offices)	(Zip Code)

Registrant's telephone number, including area code: (847) 482-3000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.01 per share	PKG	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes  ☒  No  ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes  ☐  No  ☒  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  ☒  No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes  ☒  No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒  

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  ☐  No  ☒

At June 30, 2020, the last day of the Registrant's most recently completed second fiscal quarter, the aggregate market value of Registrant's common equity held by non-affiliates was approximately $9,321,915,008 based upon the closing sale price as reported on the New York Stock Exchange. This calculation of market value has been made for the purposes of this report only and should not be considered as an admission or conclusion by the Registrant that any person is in fact an affiliate of the Registrant.

On February 19, 2021, there were 94,828,214 shares of Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Specified portions of the Proxy Statement for the Registrant's 2021 Annual Meeting of Stockholders are incorporated by reference to the extent indicated in Part III of this Form 10-K.

Table of Contents

	PART I
Item 1.	Business	2
	Packaging	3
	Paper	6
	Corporate and Other	7
	Human Capital	7
	Regulatory and Environmental Matters	8
	Executive Officers of the Registrant	8
Item 1A.	Risk Factors	9
Item 1B.	Unresolved Staff Comments	14
Item 2.	Properties	14
Item 3.	Legal Proceedings	15
Item 4.	Mine Safety Disclosure	15
	PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities	16
Item 6.	Selected Financial Data	18
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	19
	Overview	19
	Executive Summary	19
	Industry and Business Conditions	21
	Results of Operations	22
	Liquidity and Capital Resources	24
	Commitments	26
	Off-Balance Sheet Arrangements	27
	Inflation and Other General Cost Increases	27
	Regulatory and Environmental Matters	28
	Critical Accounting Policies and Estimates	29
	New and Recently Adopted Accounting Standards	32
	Reconciliations of Non-GAAP Financial Measures to Reported Amounts	32
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	34
Item 8.	Financial Statements and Supplementary Data	35
Item 9.	Changes In and Disagreements With Accountants on Accounting and Financial Disclosure	80
Item 9A.	Controls and Procedures	80
Item 9B.	Other Information	80
	PART III
Item 10.	Directors, Executive Officers, and Corporate Governance	81
Item 11.	Executive Compensation	81
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	81
Item 13.	Certain Relationships and Related Transactions, and Director Independence	82
Item 14.	Principal Accounting Fees and Services	82
	PART IV
Item 15.	Exhibits, Financial Statement Schedules	83
	Signatures	86

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PART I

Item 1. BUSINESS

Packaging Corporation of America (“we,” “us,” “our,” “PCA,” or the “Company”) is the third largest producer of containerboard products and the third largest producer of uncoated freesheet (UFS) paper in North America. We operate six containerboard mills, two uncoated freesheet (UFS) paper mills, and 90 corrugated products manufacturing plants. We are headquartered in Lake Forest, Illinois and operate primarily in the United States.

We report in three reportable segments: Packaging, Paper and Corporate and Other. For segment financial information see Note 19, Segment Information, of the Notes to Consolidated Financial Statements in “Part II, Item 8, Financial Statements and Supplementary Data” of this Form 10-K.

During the fourth quarter of 2020, due to an increase in demand for our corrugated products and as part of our assessment of a potential conversion to produce containerboard, we began producing high-performance, virgin kraft linerboard on the No. 3 machine at our Jackson, Alabama mill on a trial basis. Before October 2020, operating results for the Jackson mill were included in the Paper segment. Beginning in October 2020, operating results for the Jackson mill are included in both the Packaging and Paper segments.

During the second quarter of 2018, we discontinued the production of paper grades at the Wallula, Washington mill and converted the No. 3 machine to production of virgin kraft linerboard. Before May 2018, operating results for the Wallula mill were included in the Paper segment. After May 2018, operating results for the Wallula mill are primarily included in the Packaging segment.

Production and Shipments

The following table summarizes the Packaging segment's containerboard production and corrugated products shipments and the Paper segment's UFS production.

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Full Year
Containerboard Production	2020		1,047		1,072		1,048		1,174		4,341
(thousand tons)	2019		1,037		1,063		1,070		1,079		4,249
	2018		953		1,020		1,087		1,021		4,081
Corrugated Shipments (BSF)	2020		15.3		15.1		16.0		16.4		62.8
	2019		14.5		14.9		15.1		14.9		59.4
	2018		14.4		15.1		14.8		14.6		58.9
UFS Production	2020		224		148		129		147		648
(thousand tons)	2019		239		236		236		236		947
	2018		279		252		239		247		1,017

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Below is a map of our locations:

Packaging

Packaging Products

Our containerboard mills produce linerboard and corrugating medium, which are primarily used in the production of corrugated products. Our corrugated products manufacturing plants produce a wide variety of corrugated packaging products, including conventional shipping containers used to protect and transport manufactured goods, multi-color boxes and displays with strong visual appeal that help to merchandise the packaged product in retail locations, and honeycomb protective packaging. In addition, we are a large producer of packaging for meat, fresh fruit and vegetables, processed food, beverages, and other industrial and consumer products.

During the year ended December 31, 2020, our Packaging segment produced 4.3 million tons of containerboard at our mills. Our corrugated products manufacturing plants sold 62.8 billion square feet (BSF) of corrugated products. The Packaging segment’s net sales to third parties totaled $5.9 billion in 2020.

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Facilities

We manufacture containerboard, which includes a variety of performance and specialty grades, at six containerboard mills. Total annual containerboard capacity was approximately 4.3 million tons as of December 31, 2020. We also produce corrugated and protective packaging products at 90 manufacturing locations. The following provides more details of our operations:

Counce. Our Counce, Tennessee mill produces kraft linerboard on two machines. The mill can produce basis weights from 26 lb. to 90 lb.

DeRidder. Our DeRidder, Louisiana mill produces kraft linerboard on its No. 1 machine and kraft linerboard and corrugating medium on its No. 2 machine. The mill can produce linerboard in basis weights of 26 lb. to 69 lb. and medium in basis weights of 23 lb. to 33 lb.

Valdosta. Our Valdosta, Georgia mill produces kraft linerboard on one machine. The mill can produce basis weights from 35 lb. to 96 lb.

Tomahawk. Our Tomahawk, Wisconsin mill produces corrugating medium on two machines. The mill can produce basis weights from 23 lb. to 47 lb.

Filer City. Our Filer City, Michigan mill produces corrugating medium on three machines. The mill can produce basis weights from 20 lb. to 47 lb.

Wallula. Our Wallula, Washington mill produces corrugating medium on its No. 2 machine and kraft linerboard on its No. 3 machine. The mill can produce medium in basis weights from 23 lb. to 33 lb. and linerboard in basis weights from 31 lb. to 52 lb.

We operate 90 corrugated manufacturing and protective packaging operations, a technical and development center, 10 regional design centers, a rotogravure printing operation, and a complement of packaging supplies and distribution centers. Of the 90 manufacturing facilities, 58 operate as combining operations, commonly called corrugated plants, which manufacture corrugated sheets and finished corrugated packaging products, 31 are sheet plants, which procure combined sheets and manufacture finished corrugated packaging products, and one is a corrugated sheet-only manufacturer.

Corrugated products plants tend to be located in close proximity to customers to minimize freight costs. Each of our plants serve a market radius of approximately 150 miles. Our sheet plants are generally located in close proximity to our larger corrugated plants, which enables us to offer additional services and converting capabilities such as small volume and quick turnaround items.

Major Raw Materials Used

Fiber supply. Fiber is the largest raw material cost to manufacture containerboard. We consume both wood fiber and recycled fiber in our containerboard mills. Our mill system has the capability to shift a portion of its fiber consumption between softwood, hardwood, and recycled sources. All of our mills can utilize virgin wood fiber and all of our mills, other than the Valdosta mill, can utilize some recycled fiber in their containerboard production. Our corrugated manufacturing operations generate recycled fiber as a by-product from the manufacturing process, which is consumed by our mills. In 2020, our usage of recycled fiber, net of internal generation, represents 17% of our containerboard production.

We procure wood fiber through leases of cutting rights, long-term supply agreements, and market purchases and believe we have adequate sources of fiber supply for the foreseeable future.

We participate in the Sustainable Forestry Initiative^® (SFI), the Programme for the Endorsement of Forest Certification (PEFC), as well as the Forest Stewardship Council^® (FSC^®), and we are certified under their sourcing and chain of custody standards. These standards are aimed at ensuring the long-term health and conservation of forestry resources. We are committed to sourcing wood fiber through environmentally, socially, and economically sustainable practices and promoting resource and conservation stewardship ethics.

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Energy supply. Energy at our packaging mills is obtained through self-generated or purchased fuels and electricity. Fuel sources include by-products of the containerboard manufacturing and pulping process (including black liquor and wood waste), natural gas, purchased wood waste, and other purchased fuels. Each of our mills self-generates process steam requirements from by-products (black liquor and wood waste), as well as from the various purchased fuels. The process steam is used throughout the production process and also to generate electricity.

In 2020, our packaging mills consumed about 74 million MMBTUs of fuel to produce both steam and electricity. Of the 74 million MMBTUs consumed, about 63% was from mill generated by-products and 37% was from purchased fuels. Of the purchased fuels, 78% was from natural gas, 20% was from purchased wood waste and 2% was from other purchased fuels.

Chemical supply. We consume various chemicals in the production of containerboard, including caustic soda, sulfuric acid, soda ash, and lime. Most of our chemicals are purchased under contracts, which are bid or negotiated periodically.

Sales, Marketing, and Distribution

Our corrugated products are sold through our direct sales and marketing organization, independent brokers, and distribution partners. We have sales representatives and a sales manager at most of our corrugated manufacturing operations and also have corporate account managers who serve customer accounts with a national presence. Additionally, our design centers maintain an on-site dedicated graphics sales force. In addition to direct sales and marketing personnel, we utilize new product development engineers and product graphics and design specialists. These individuals are located at both the corrugated plants and the design centers. General marketing support is located at our corporate headquarters.

Our containerboard sales group is responsible for linerboard and corrugating medium order processing and sales to our corrugated plants, to outside domestic customers, and to export customers. These personnel also coordinate and execute all containerboard trade agreements with other containerboard manufacturers.

Containerboard produced in our mills is shipped by rail or truck. Our corrugated products are delivered by truck due to our large number of customers and their demand for timely service. Our corrugated manufacturing operations typically serve customers within a 150-mile radius. We sometimes use third-party warehouses for short-term storage of corrugated products.

Customers

We sell containerboard and corrugated products to approximately 16,000 customers in approximately 33,000 locations. About 70% of our corrugated products sales are to regional and local accounts, which are broadly diversified across industries and geographic locations. The remaining 30% of our customer base consists primarily of national accounts that have multiple locations and are served by a number of PCA plants. No single customer exceeds 10% of segment sales.

The primary end-use markets in the United States for corrugated products are shown below as reported in the 2019 Fibre Box Association annual report:

Food, beverages, and agricultural products	45	%
Retail and wholesale trade	22	%
Paper and other products	14	%
Chemical, plastic, and rubber products	10	%
Miscellaneous manufacturing	9	%

Competition

As of December 31, 2020, we were the third largest producer of containerboard products in North America, according to industry sources and our own estimates. According to industry sources, corrugated products are produced by about 450 U.S. companies operating approximately 1,200 plants. The primary basis for competition for most of our packaging products includes quality, service, price, product design, and innovation. Most corrugated products are manufactured to the customer’s specifications. Corrugated producers generally sell within a 150-mile radius of their plants and compete with other corrugated producers in their local region. Competition in our corrugated products operations tends to be regional, although we also face competition from competitors with significant national account presence.

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On a national level, our primary competitors are International Paper Company, WestRock Company, Georgia-Pacific LLC, and Pratt Industries. However, with our strategic focus on regional and local accounts, we also compete with the smaller, local producers.

Paper

We are the third largest manufacturer of UFS in North America, according to industry sources and our own estimates. We manufacture and sell papers, including both commodity and specialty papers, which may have custom or specialized features such as colors, coatings, high brightness, and recycled content. Our papers consist of communication papers, including cut-size office papers, and printing and converting papers.

Facilities

We currently have two paper mills located in the United States. Total annual UFS capacity is 964,000 tons. Our operations include the following:

Jackson. Our Jackson, Alabama mill produces both commodity and specialty papers on two paper machines.

International Falls. Our International Falls, Minnesota mill produces both commodity and specialty papers on two paper machines.

Major Raw Materials Used

Fiber supply. Fiber is the largest raw material cost in this segment. We consume wood fiber, recycled fiber, and purchased pulp. Our Jackson mill purchases recycled fiber to produce our line of recycled office papers. We purchase wood fiber through contracts and open-market purchase, and we purchase recycled fiber and pulp from third parties pursuant to contractual agreements.

We participate in the Sustainable Forestry Initiative^® (SFI), the Programme for the Endorsement of Forest Certification (PEFC), as well as the Forest Stewardship Council^® (FSC^®), and we are certified under their sourcing and chain of custody standards. These standards are aimed at ensuring the long-term health and conservation of forestry resources. We are committed to sourcing wood fiber through environmentally, socially, and economically sustainable practices and promoting resource and conservation stewardship ethics.

Energy supply. We obtain energy through self-generated or purchased fuels and electricity. Fuel sources include by-products of the manufacturing and pulping process (including black liquor and wood waste), natural gas, electricity, and purchased wood waste. Each of the paper mills self-generates process steam requirements from by-products (black liquor and wood waste), as well as from the various purchased fuels. The process steam is used throughout the production process and to generate electricity.

In 2020, our paper mills consumed about 19 million MMBTUs of fuel to produce both steam and electricity. Of the 19 million MMBTUs consumed, about 75% was from mill generated by-products and 25% was from purchased fuels. Of the purchased fuels, 89% was from natural gas and 11% from purchased wood waste.

Chemical supply. We consume various chemicals in the production of white papers, including starch, precipitated calcium carbonate, caustic soda, and sodium chlorate. Most of our chemicals are purchased under contracts, which are bid or negotiated periodically.

Sales, Marketing, and Distribution

Our papers are sold primarily through our sales and marketing organization. We ship to customers both directly from our mills and through distribution centers and a network of outside warehouses by rail or truck. This allows us to respond quickly to customer requirements.

Customers

We have over 100 customers in approximately 400 locations. These customers include office products distributors and retailers, paper merchants, and envelope and other converters. We have established long-term relationships with many of our

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customers. Office Depot, Inc. is our largest customer in the Paper segment. Effective January 1, 2020, we have a revised agreement with Office Depot in which we will continue to supply commodity and non-commodity office papers to Office Depot through December 31, 2022. Office Depot is not subject to a minimum volume commitment and is entitled to receive rebates for achieving certain volume thresholds. If the agreement is not renewed by the parties, Office Depot’s obligation to purchase paper would phase down over a two-year period beginning on January 1, 2023. In 2020, our sales revenue to Office Depot represented 45% of our Paper segment sales revenue and 5% of our consolidated sales revenue.

Competition

The markets in which our Paper segment competes are large and highly competitive. Commodity grades of UFS paper are globally traded, with numerous worldwide manufacturers, and as a result, these products compete primarily on the basis of price. All of our paper manufacturing facilities are located in the United States, and although we compete primarily in the domestic market, we do face competition from foreign producers. In 2016, as a result of a case brought by us and other domestic producers before United States international trade authorities, antidumping and countervailing duties at various levels were imposed on producers of uncoated freesheet papers produced in Australia, Brazil, China, Indonesia, and Portugal. These duties remain in effect and are subject to review in 2021. Other factors influencing competition from overseas producers include domestic and foreign demand and foreign currency exchange rates.

Our largest competitors include Domtar Corporation and International Paper Company. We also face competition from foreign producers. Although price is the primary basis for competition in most of our paper grades, quality and service are also important competitive determinants. Our papers compete with electronic data transmission, e-readers, electronic document storage alternatives, and paper grades we do not produce. Increasing shifts to these alternatives have had, and are likely to continue to have, an adverse effect on traditional print media and paper usage and lower demand for communication papers.

Corporate and Other

Our Corporate and Other segment includes corporate support staff services and related assets and liabilities. This segment also includes transportation assets, such as rail cars and trucks, which we use to transport some of our products to and from our manufacturing sites, and assets related to a 50% owned variable interest entity, Louisiana Timber Procurement Company, L.L.C. (LTP).

Human Capital

PCA’s success depends on a highly engaged, results-oriented workforce operating in an entrepreneurial culture. Our primary objective is to place the right people in the right roles, and empower them to succeed.  

Safety is a core value at PCA and we believe that all accidents are preventable and an injury-free environment is achievable. We have implemented a robust occupational health and safety management system to assure accountability throughout the organization for safe work practices. Key components to our system include commitment from management, extensive training of employees, hazard identification and communication and regular safety audits.  

During 2020, we were committed to conducting safe operations through the COVID-19 pandemic in accordance with the guidelines of the Center for Disease Control and applicable health and safety regulations. As PCA’s operations continued to operate as “essential businesses,” we adopted measures to protect the health and safety of our employees, including social distancing practices, health screening procedures, enhanced sanitation procedures and enhanced absence pay policies. These practices will continue into 2021 as the effects of the pandemic continue. PCA did not experience significant disruptions in its operations as a result of the pandemic and has maintained adequate availability of its workforce and supply of raw materials and services to continue to serve its customers.

We have extensive recruiting, training and development programs designed to attract and retain a highly talented workforce aligned with our objectives to relentlessly serve our customers and achieve operational excellence throughout our organization. As demand for qualified personnel is increasing, we are expanding our efforts in these critical areas along with efforts to continue to develop, promote and maintain a diverse workforce with a culture and an environment of respect and inclusion. These principles are designed to develop and promote strong and increasing engagement of all PCA employees.

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As of December 31, 2020, we had approximately 15,200 employees, including 4,500 salaried and 10,700 hourly employees. Approximately 62% of our hourly employees worked pursuant to collective bargaining agreements. The majority of our unionized employees are represented by the United Steel Workers (USW), the International Brotherhood of Teamsters (IBT), the International Association of Machinists (IAM), and the Association of Western Pulp and Paper Workers (AWPPW). We are currently in negotiations to renew or extend union contracts that have recently expired or are expiring in the near future. During 2020, we experienced no work stoppages, and we believe we have satisfactory labor relations with our employees.

Regulatory and Environmental Matters

A discussion of the financial impact of our compliance with environmental laws is presented under the caption “Regulatory and Environmental Matters” in “Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations” of this Form 10-K.

Executive Officers of the Registrant

Brief statements setting forth the age at February 24, 2021, the principal occupation, employment during the past five years, the year in which such person first became an officer of PCA, and other information concerning each of our executive officers appears below.

Mark W. Kowlzan, 65, Chairman and Chief Executive Officer - Mr. Kowlzan has served as PCA's Chairman since January 2016 and as Chief Executive Officer and a director since July 2010. From 1998 through June 2010, Mr. Kowlzan led the company’s containerboard mill system, first as Vice President and General Manager and then as Senior Vice President - Containerboard. From 1996 through 1998, Mr. Kowlzan served in various senior mill-related operating positions with PCA and Tenneco Packaging, including as manager of the Counce linerboard mill. Prior to joining Tenneco Packaging, Mr. Kowlzan spent 15 years at International Paper Company, a global paper and packaging company, where he held a series of operational and managerial positions within its mill organization. Mr. Kowlzan is a member of the board of American Forest and Paper Association.

Thomas A. Hassfurther, 65, Executive Vice President - Corrugated Products - Mr. Hassfurther has served as Executive Vice President - Corrugated Products of PCA since September 2009. From February 2005 to September 2009, Mr. Hassfurther served as Senior Vice President - Sales and Marketing, Corrugated Products. Prior to this he held various senior-level management and sales positions at PCA and Tenneco Packaging. Mr. Hassfurther joined the company in 1977.

Robert P. Mundy, 59, Executive Vice President and Chief Financial Officer - Mr. Mundy has served as Executive Vice President and Chief Financial Officer since May 2019. Mr. Mundy previously served as PCA’s Senior Vice President and Chief Financial Officer from 2015 to 2019. He previously served as Senior Vice President and Chief Financial Officer of Verso Corporation, a leading North American supplier of coated papers to catalog and magazine publishers, from 2006 to June 2015. Verso Corporation filed for Chapter 11 bankruptcy in January 2016. Prior to that, he worked at International Paper Company, from 1983 to 2006, where he was Director of Finance of the Coated and Supercalendered Papers division from 2002 to 2006, Director of Finance Projects from 2001 to 2002, Controller of Masonite Corporation from 1999 to 2001, and Controller of the Petroleum and Minerals business from 1996 to 1999. He served in various business positions at International Paper from 1983 to 1996.

Pamela A. Barnes, 56, Senior Vice President – Finance and Controller - Ms. Barnes has served as Senior Vice President – Finance and Controller since May 2019. Ms. Barnes previously served as a Vice President in PCA’s finance organization from 2012 to 2019. After joining the company in 1992, she has held various positions of increasing responsibility, including serving as PCA’s Treasurer since 1999. Before joining PCA, Ms. Barnes worked for Deloitte & Touche.

Charles J. Carter, 61, Senior Vice President - Containerboard Mill Operations - Mr. Carter has served as Senior Vice President - Containerboard Mill Operations since July 2013. Prior to this, he served as Vice President – Containerboard Mill Operations since January 2011. From March 2010 to January 2011, Mr. Carter served as PCA’s Director of Papermaking Technology. Prior to joining PCA in 2010, Mr. Carter spent 28 years with various pulp and paper companies in managerial and technical positions of increasing responsibility, most recently as Vice President and General Manager of the Calhoun, Tennessee mill of Abitibi Bowater from 2007 to 2010 and as manager of SP Newsprint’s Dublin, Georgia mill from 1999 to 2007.

Jeff S. Kaser, 55, Senior Vice President – Corrugated Products - Mr. Kaser has served as Senior Vice President — Corrugated Products since May 2020. Prior to this, he served as Vice President and Area General Manager of PCA’s Midwest Area, Mid-Atlantic Area and Pennsylvania Region. Mr. Kaser joined PCA in 1987 and has also held plant positions in sales, sales management and general management.

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Kent A. Pflederer, 50, Senior Vice President, General Counsel and Secretary - Mr. Pflederer has served as Senior Vice President, General Counsel and Corporate Secretary since January 2013 and has led our legal department since June 2007. Prior to joining PCA, Mr. Pflederer served as Senior Counsel, Corporate and Securities, at Hospira, Inc. from 2004 to 2007 and served in the corporate and securities practice at Mayer Brown, LLP from 1996 to 2004.

Bruce A. Ridley, 65, Senior Vice President – Environmental Health and Safety and Operational Services - Mr. Ridley has served as Senior Vice President – Environmental Health and Safety and Operational Services since May 2019. Mr. Ridley previously served as Vice President of Operations from 2012 to 2019 and at PCA’s Tomahawk, Wisconsin containerboard mill as the Operations Manager and Mill Manager from 1999 to 2011. Before joining PCA, he held several positions of increasing responsibility at multiple locations during his 19 years with International Paper Co. and two years with Champion International.

Robert A. Schneider, 55, Senior Vice President and Chief Information Officer - Mr. Schneider has served as Senior Vice President and Chief Information Officer since May 2019. He previously served as Vice President and Chief Information Officer from 2000 to 2019. Mr. Schneider joined the company in 1989 and has held various management and other positions of increasing responsibility in information systems for PCA.

D. Ray Shirley, 49, Senior Vice President – Corporate Engineering and Process Technology - Mr. Shirley has served as PCA’s Senior Vice President – Corporate Engineering and Process Technology since May 2019. Mr. Shirley previously served as PCA’s Vice President – Containerboard Mills Engineering and Process Technology from 2012 to 2019 and as Mill Manager at PCA’s Counce, Tennessee containerboard mill from 2010 to 2012. He has served in various management roles within the company, including the Operations Manager at the Filer City, Michigan containerboard mill. Before joining PCA in 1996, Mr. Shirley worked for Georgia-Pacific Corporation.

Thomas W.H. Walton, 61, Senior Vice President - Sales and Marketing, Corrugated Products - Mr. Walton has served as Senior Vice President - Sales and Marketing, Corrugated Products since October 2009. Prior to this, he served as a Vice President and Area General Manager within the Corrugated Products Group since 1998. Mr. Walton joined the company in 1981 and has also held positions in production, sales, and general management.

Available Information

PCA’s internet website address is www.packagingcorp.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 are available free of charge through our website as soon as reasonably practicable after they are electronically filed with, or furnished to, the Securities and Exchange Commission. In addition, our Code of Ethics may be accessed in the Investor Relations section of PCA’s website. PCA’s website and the information contained or incorporated therein are not intended to be incorporated into this report.

Item 1A. RISK FACTORS

Some of the statements in this report and, in particular, statements found in Management’s Discussion and Analysis of Financial Condition and Results of Operations, that are not historical in nature are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements about our expectations regarding our future liquidity, earnings, expenditures, and financial condition. These statements are often identified by the words “will,” “should,” “anticipate,” “believe,” “expect,” “intend,” “estimate,” “hope,” or similar expressions. These statements reflect management’s current views with respect to future events and are subject to risks and uncertainties. There are important factors that could cause actual results to differ materially from those in forward-looking statements, many of which are beyond our control. These factors, risks and uncertainties include, but are not limited to, the factors described below.

Our actual results, performance, or achievement could differ materially from those expressed in, or implied by, these forward-looking statements, and accordingly, we can give no assurances that any of the events anticipated by the forward-looking statements will transpire or occur, or if any of them do so, what impact they will have on our results of operations or financial condition. In view of these uncertainties, investors are cautioned not to place undue reliance on these forward-looking statements. We expressly disclaim any obligation to publicly revise or otherwise update any forward-looking statements that have been made to reflect the occurrence of events after the date hereof.

In addition to the risks and uncertainties we discuss elsewhere in this Form 10-K (particularly in “Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations”) or in our other filings with the

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Securities and Exchange Commission (SEC), the following are important factors that could cause our actual results to differ materially from those we project in any forward-looking statement.

Risks Related to the COVID-19 Pandemic

The future effect of the COVID-19 pandemic on our operations is uncertain. On March 11, 2020, the World Health Organization declared the COVID-19 outbreak a pandemic. Since that time, federal, state and local authorities have taken measures to control the outbreak of COVID-19 in the United States, where we primarily operate. These measures have included travel bans and restrictions, quarantines and shelter in place orders. Due to the importance of our products to the continued distribution of food, beverage and other necessities, our operating facilities have been permitted to remain in operation and we have not experienced material disruptions in operations to date. Despite the spread of the virus in the United States, we have maintained sufficient workforce availability as well as adequate supply of raw materials and necessary services to continue operating without material disruption. However, the impact of the further spread of the virus and the measures to control the spread of the virus are uncertain and may materially restrict or hinder our ability to operate our facilities due to measures we may need to take to assure the health and safety of our employees, lack of available workforce, disruptions in the supply of key materials and services or restrictions due to governmental actions. We cannot assure you as to the timing and effectiveness of vaccination efforts on the control of spread of the virus. If our operations are hindered or restricted, we may not be able to serve our customers, which could have a material adverse effect on our business, financial condition and results of operations.

The pandemic resulting from the COVID-19 outbreak, and measures to control the outbreak, are having a negative impact on domestic economic activity, which could adversely affect demand for our products and our business, financial condition and results of operations. Many businesses in the United States have been required to cease or curtail operations and workers have been laid off or furloughed, and have slowed down economic activity. The severity and duration of the impact on the economy will depend on the future spread of the outbreak, future measures by governmental authorities to control the outbreak, the timing and effectiveness of vaccination efforts, the timing and manner in which normal social and business activities are permitted to resume and the effectiveness of governmental efforts to mitigate the economic effect of the outbreak, all of which are highly uncertain.

We have experienced significantly lower demand for our uncoated freesheet paper products, due to economic conditions, office closings and school shutdowns associated with the COVID-19 pandemic, which harmed the performance of our Paper segment. Our Jackson, Alabama mill was idled for the majority of the second and third quarters of 2020 and began to produce containerboard for the Packaging segment on a trial basis during the fourth quarter. While we have not experienced lower demand for our containerboard and corrugated packaging products to date, the effect of the pandemic on economic conditions affecting our business and future demand is uncertain. It is uncertain whether, to what extent and for what period of time current favorable demand conditions in the Packaging segment will continue. With the uncertainty of economic conditions, we are unable to determine the impact on our future operating and financial performance. A prolonged period of lower earnings and reduced cash flow could adversely affect our ability to fund operations, capital requirements, and common stock dividend payments and access capital markets.

Risks Related to our Operations, Business and Industry

Industry Cyclicality - Changes in the prices of our products could materially affect our financial condition, results of operations, and liquidity. Macroeconomic conditions and fluctuations in industry capacity can create changes in prices, sales volumes, and margins for most of our products, particularly commodity grades of packaging and paper products. Prices for all of our products are driven by many factors, including demand for our products, industry capacity and decisions made by other producers with respect to capacity and production, and other competitive conditions in our industry. These factors are affected by general global and domestic economic conditions. We have little influence over the timing and extent of price changes of our products, which may be unpredictable and volatile. In addition, as many of our customer contracts include price adjustment provisions based upon published index prices for containerboard or certain grades of UFS papers, our selling prices are influenced by index levels published by trade publications. Changes in how these index levels are determined or maintained may affect our sales prices. If supply exceeds demand, industry operating conditions deteriorate or other factors result in lower prices for our products, our earnings and operating cash flows would be harmed.

Competition - The intensity of competition in the industries in which we operate could result in downward pressure on pricing and volume, which could lower earnings and operating cash flows. Our industries are highly competitive, with no single containerboard, corrugated packaging, or UFS paper producer having a dominant position. Containerboard and commodity UFS paper products cannot generally be differentiated by producer, which tends to intensify price competition. The corrugated packaging industry is also sensitive to changes in economic conditions, as well as other factors including innovation,

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design, quality, and service. To the extent that one or more competitors are more successful than we are with respect to any key competitive factor, our business could be adversely affected. Our packaging products also compete, to some extent, with various other packaging materials, including products made of paper, plastics, wood, and various types of metal. If we are unable to successfully compete, we may lose market share or may be required to charge lower sales prices for our products, both of which would reduce our earnings and operating cash flows.

UFS paper products compete with electronic data transmission and document storage alternatives. Increasing shifts to electronic alternatives have had and will continue to have an adverse effect on usage of these products. As a result of such competition, the industry is experiencing decreasing demand for existing UFS paper products. As the use of these alternatives grows, demand for UFS paper products is likely to further decline. Declines in demand for our paper products may adversely affect our earnings and operating cash flows.

Some of our competitors are larger than we are and may have greater financial and other resources, greater manufacturing economies of scale, greater energy self-sufficiency, or lower operating costs, compared to our company. We may be unable to compete effectively with these companies particularly during economic downturns. Some of the factors that may adversely affect our ability to compete in the markets in which we participate include the entry of new competitors into the markets we serve, increased competition from overseas producers, our competitors' pricing strategies, changes in customer preferences, and the cost-efficiency of our facilities.

Cost of Fiber - An increase in the cost of fiber could increase our manufacturing costs and lower our earnings. The market price of wood fiber varies based upon availability, source, and the costs of fuels used in the harvesting and transportation of wood fiber. The cost and availability of wood fiber can also be impacted by weather, general logging conditions, geography, and regulatory activity.

The availability and cost of recycled fiber depends heavily on recycling rates and the domestic and global demand for recycled products. We purchase recycled fiber for use at five of our six containerboard mills and both paper mills. In 2020, we purchased approximately 725,000 tons of recycled fiber, net of the recycled fiber generated by our corrugated box plants. The amount of recycled fiber purchased each year varies based upon production and the prices of both recycled fiber and wood fiber.

Periods of supply and demand imbalance have created significant price volatility. Periods of higher recycled fiber costs and unusual price volatility have occurred in the past, including during 2020 as demand for domestic recycled fiber from Chinese producers continued to remain low. Prices for recycled fiber may continue to fluctuate significantly in the future, which could result in higher costs and lower earnings. A $10 per ton price increase in recycled fiber for our containerboard mills would result in approximately $7 million of additional expense based on 2020 consumption.

Cost of Purchased Fuels and Chemicals - An increase in the cost of purchased fuels and chemicals could lead to higher manufacturing costs, resulting in reduced earnings. We have the ability to use various types of purchased fuels in our manufacturing operations, including natural gas, bark, and other purchased fuels. Fuel prices, in particular prices for oil and natural gas, have fluctuated in the past. New and more stringent environmental regulations may discourage, reduce the availability of, or make more expensive, the use of certain fuels, particularly coal and fossil fuels. In addition, costs for key chemicals used in our manufacturing operations also fluctuate. These fluctuations impact our manufacturing costs and result in earnings volatility. If fuel and chemical prices rise, our production costs and transportation costs will increase and cause higher manufacturing costs and reduced earnings if we are unable to recover such increases through higher prices of our products. A $0.10 per million MMBTU increase in natural gas prices would result in approximately $3 million of additional expense, based on 2020 usage.

Customer Concentration - We rely on certain large customers. Our packaging and paper segments each have large customers, the loss of which could adversely affect the segment’s sales and profitability. In particular, because our businesses operate in highly competitive industry segments, we regularly bid for new business or for renewal of existing business. The loss of business from our larger customers, or the renewal of business on less favorable terms, may adversely impact our financial results.

Office Depot, Inc. is our largest customer in the Paper segment. Effective January 1, 2020, we have a revised agreement with Office Depot in which we will continue to supply commodity and non-commodity office papers to Office Depot through December 31, 2022. Office Depot is not subject to a minimum volume commitment and is entitled to receive rebates for achieving certain volume thresholds. If the agreement is not renewed by the parties, Office Depot’s obligation to purchase paper would phase down over a two-year period beginning on January 1, 2023.

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In 2020, sales to Office Depot represented 45% of our Paper segment sales and 5% of our consolidated sales. If these sales are reduced, including if we are unable to renew the agreement at historical volume levels, 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 makes Office Depot less willing to purchase our products will harm our business and results of operations.

Transportation Costs - Reduced truck and rail availability could lead to higher costs or poorer service, resulting in lower earnings, and harm our ability to distribute our products. We ship our products primarily by truck and rail. We have experienced lower availability of third-party trucking services and service issues, interruptions, and delays in rail services. We have also experienced higher costs for transportation services in general. If these factors persist, we could experience even higher transportation costs in the future and difficulties shipping our products in a timely manner. We may not be able to recover higher transportation costs through higher prices or otherwise, which would result in lower earnings.

Material Disruption of Manufacturing - A material disruption at one of our manufacturing facilities could prevent us from meeting customer demand, reduce our sales, and/or negatively affect our results of operations and financial condition. Our business depends on continuous operation of our facilities, particularly at our mills. Any of our manufacturing facilities, or any of our machines within such facilities, could cease operations unexpectedly for a significant period of time due to a number of events, including:

• Unscheduled maintenance outages.

• Prolonged power failures.

• Equipment or information system breakdowns or failures.

• Explosion of a boiler or other major facilities.

• Disruption in the supply of raw materials, such as wood fiber, energy, or chemicals.

• A spill or release of pollutants or hazardous substances.

• Closure or curtailment related to environmental concerns.

• Labor difficulties.

• Disruptions in the transportation infrastructure, including roads, bridges, railroad tracks, and tunnels.

• Fires, floods, earthquakes, hurricanes, or other catastrophic events.

• Terrorism or threats of terrorism.

• Other operational problems.

These events could harm our ability to produce our products and serve our customers and may lead to higher costs and reduced earnings.

Reliance on Personnel - We may fail to attract and retain qualified personnel, including key management personnel. Our ability to operate and grow our business depends on our ability to attract and retain employees with the skills necessary to operate and maintain our facilities, produce our products and serve our customers. The increasing demand for qualified personnel may make it more difficult for us to attract and retain qualified employees. Changing demographics and labor work force trends may make it difficult for us to replace retiring employees at our manufacturing and other facilities. If we fail to attract and retain qualified personnel, or if we experience labor shortages, we may experience higher costs and other difficulties, and our business may be adversely impacted.

In addition, we rely on key executive and management personnel to manage our business efficiently and effectively. As our business has grown in size and geographic scope, we have relied on these individuals to manage increasingly complex operations. The loss of any of our key personnel could adversely affect our business.

Cyber Security - Risks related to security breaches of company, customer, employee, and vendor information, as well as the technology that manages our operations and other business processes, could adversely affect our business. We rely on various information technology systems to capture, process, store, and report data and interact with customers, vendors, and employees. Despite careful security and controls design, implementation, updating, and internal and independent third-party assessments, our information technology systems, and those of our third party providers, could become subject to cyber-attacks or security breaches. Network, system, and data breaches could result in misappropriation of sensitive data or operational

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disruptions including interruption to systems availability and denial of access to and misuse of applications required by our customers to conduct business with us. Misuse of internal applications; theft of intellectual property, trade secrets, or other corporate assets; and inappropriate disclosure of confidential information could stem from such incidents. Delayed sales, slowed production, or other issues resulting from these disruptions could result in lost sales, business delays, and negative publicity and could have a material adverse effect on our operations, financial condition, or operating cash flows.

Environmental Matters - PCA may incur significant environmental liabilities with respect to both past and future operations. We are subject to, and must comply with, a variety of federal, state and local environmental laws, particularly those relating to air and water quality, waste disposal and the cleanup of contaminated soil and groundwater. Failure to comply with these regulations could result in fines, which may be significant, or other adverse regulatory action. Because environmental regulations are constantly evolving, we have incurred, and will continue to incur, costs to maintain compliance with those laws. See Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Environmental Matters” for estimates of expenditures we expect to make for environmental compliance in the next few years. New and more stringent environmental regulations may be adopted and may require us to incur additional operating expenses and/or significant additional capital expenditures to modify or replace certain of our boilers and other equipment. In addition, environmental regulations may increase the cost of our raw materials and purchased energy. Although we have established reserves to provide for known environmental liabilities, these reserves may change over time due to the enactment of new environmental laws or regulations or changes in existing laws or regulations, which might require additional significant environmental expenditures.

Labor Relations- If we experience strikes or other work stoppages, our business will be harmed. Our workforce is highly unionized and operates under various collective bargaining agreements. We must negotiate to renew or extend any union contracts that have recently expired or are expiring in the near future. While we believe that we have satisfactory labor relations, we may not be able to successfully negotiate new agreements without work stoppages or labor difficulties in the future or renegotiate them on favorable terms. If we are unable to successfully renegotiate the terms of any of these agreements, or if we experience any extended interruption of operations at any of our facilities as a result of strikes or other work stoppages, our business, results of operations and financial condition may be harmed.

Financial Risks

General Economic Conditions - If business, political, and economic conditions change in an adverse manner, our business, results of operations, liquidity, and financial position may be harmed. General global and domestic economic conditions directly affect the levels of demand and production of consumer goods, levels of employment, the availability and cost of credit, and ultimately, the profitability of our business. If economic conditions deteriorate and result in higher unemployment rates, lower disposable income, unfavorable currency exchange rates, lower corporate earnings, lower business investment, and lower consumer spending, we may experience lower demand for our products, which is largely driven by demand for products of our customers which utilize our products. If economic conditions result in higher inflation, we may experience higher production and transportation costs, which we may not be able to recover through higher prices or otherwise. In addition, changes in trade policy, including renegotiating or potentially terminating existing bilateral or multilateral agreements as well as the imposition of tariffs, could impact global markets and demand for our and our customers’ products and the costs associated with certain of our capital investments. Further changes in tax laws or tax rates may have a material impact on our future cash taxes, effective tax rate or deferred tax assets and liabilities. These conditions are beyond our control and may have a material impact on our business, results of operations, liquidity, and financial position.

Inflation and Other General Cost Increases - We may not be able to offset higher costs. We are subject to both contractual, inflationary, and other general cost increases, including with regard to our labor costs and purchases of raw materials and transportation services. General economic conditions may result in higher inflation, which may increase our exposure to higher costs. If we are unable to offset these cost increases by price increases, growth, and/or cost reductions in our operations, these inflationary and other general cost increases could have a material adverse effect on our operating cash flows, profitability, and liquidity.

In 2020, our total company costs including cost of sales (COS) and selling, general, and administrative expenses (SG&A) was $5.8 billion, and excluding non-cash costs (depreciation, depletion and amortization, pension and postretirement expense, and share-based compensation expense) was $5.4 billion. A 1% increase in COS and SG&A costs would increase costs by $58 million and cash costs by $54 million.

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Debt obligations - Our debt service obligations may reduce our operating flexibility. At December 31, 2020, we had $2.5 billion of debt outstanding and a $326.3 million undrawn revolving credit facility, after deducting letters of credit. All debt is comprised of fixed-rate senior notes. We and our subsidiaries are not restricted from incurring, and may incur, additional indebtedness in the future.

Our current borrowings, plus any future borrowings, may affect our ability to operate our business, including, without limitation:

• Result in significant cash requirements to make interest and maturity payments on our outstanding indebtedness;

• Increase our vulnerability to adverse changes in our business or industry conditions;

• Increase our vulnerability to increases in interest rates;

• Limit our ability to obtain additional financing for working capital, capital expenditures, general corporate, and other purposes;

• Limit our flexibility in planning for, or reacting to, changes in our business and our industry; and

• Limit our flexibility to make acquisitions.

Further, if we cannot service our indebtedness, we may have to take actions to secure additional cash by selling assets, seeking additional equity or reducing investments, which may not be achievable on acceptable terms or at all.

Pension Plans – Our pension plans may require additional funding. We record a liability associated with our pensions equal to the excess of the benefit obligations over the fair value of the assets funding the plans. The actual required amounts and timing of future cash contributions will be sensitive to changes in the applicable discount rates and returns on plan assets, and could also be impacted by future changes in the laws and regulations applicable to plan funding. Fluctuations in the market performance of our plan assets will affect our pension plan costs in future periods. Changes in assumptions regarding expected long-term rate of return on plan assets, our discount rate, expected compensation levels, or mortality will also increase or decrease pension costs.

Market Price of our Common Stock - The market price of our common stock may be volatile, which could cause the value of the stock to decline. Securities markets worldwide periodically experience significant price declines and volume fluctuations due to macroeconomic factors and other factors beyond our control. This market volatility, as well as general economic, market, or political conditions, could reduce the market price of our common stock with little regard to our operating performance. In addition, our operating results could be below the expectations of public market analysts and investors, and in response, the market price of our common stock could decrease significantly.

Item 1B. UNRESOLVED STAFF COMMENTS

None.

Item 2. PROPERTIES

We own and lease properties in our business. Primarily all of our leases are non-cancelable and are accounted for as operating leases. These leases are not subject to early termination except for standard nonperformance clauses.

Information regarding our principal operating facilities, the segments that use those facilities, and a map of geographical locations is presented in “Part I, Item 1. Business” of this Form 10-K. We assess the condition and capacity of our manufacturing, distribution, and other facilities needed to meet our operating requirements. Our properties have been generally well maintained and are in good operating condition. In general, our facilities have sufficient capacity and are adequate for our production and distribution requirements.

We currently own buildings and land for six containerboard mills and two paper mills. Additionally, we have 90 corrugated manufacturing operations, of which the buildings and land for 52 are owned, including 44 combining operations, or corrugated plants, one corrugated sheet-only manufacturer, and seven sheet plants. We lease the buildings for 14 corrugated plants and 24 sheet plants. We own warehouses and miscellaneous other properties, including sales offices and woodlands management offices. We lease space for regional design centers and numerous other distribution centers, warehouses, and facilities. The equipment in these leased facilities is, in virtually all cases, owned by us, except for forklifts and other rolling stock, which are generally leased.

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We lease the cutting rights to approximately 71,000 acres of timberland located near our Valdosta mill (64,000 acres) and our Counce mill (7,000 acres). On average, these cutting rights agreements have terms with approximately 17 years remaining.

We own our corporate headquarters building, which is located in Lake Forest, Illinois.

Item 3. LEGAL PROCEEDINGS

Information concerning legal proceedings can be found in Note 20, Commitments, Guarantees, Indemnifications, and Legal Proceedings, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K.

Item 4. MINE SAFETY DISCLOSURE

Not applicable.

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PART II

Item 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

PCA’s common stock is listed on the New York Stock Exchange (NYSE) under the symbol “PKG”.

Stockholders

On February 19, 2021, there were 109 holders of record of our common stock.

Purchases of Equity Securities

Stock Repurchase Program

On February 25, 2016, PCA announced that its Board of Directors authorized the repurchase of $200.0 million of the Company's outstanding common stock. At the time of the announcement, there was no remaining authority under previously announced programs. 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.

The Company did not repurchase any shares of its common stock under this authority during the years ended December 31, 2020, 2019, and 2018. As of December 31, 2020, we are authorized to repurchase $193.0 million of the Company’s common stock.

Pursuant to its equity incentive plan, the Company withholds shares from vesting employee equity awards to cover employee tax liabilities. Total shares withheld in 2020 were 107,627 to cover $10.5 million in employee tax liabilities. Total shares withheld in 2019 were 87,668 to cover $8.2 million of employee tax liabilities. Total shares withheld in 2018 were 69,255 for $7.9 million in employee tax liabilities.

The following table presents information related to our repurchases of common stock made under repurchase plans authorized by PCA's Board of Directors, and shares withheld to cover taxes on vesting of equity awards, during the three months ended December 31, 2020:

Issuer Purchases of Equity Securities
Period	Total Number of Shares Purchased (a)		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs (in millions)
October 1-31, 2020		40	$	118.70		—	$	193.0
November 1-30, 2020		—		—		—		193.0
December 1-31, 2020		—		—		—		193.0
Total		40	$	118.70		—	$	193.0

(a) 40 shares were withheld from employees to cover income and payroll taxes on equity awards that vested during the period.

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Performance Graph

The graph below compares PCA’s cumulative 5-year total shareholder return on common stock with the cumulative total returns of the S&P 500 index; the S&P Midcap 400 index; and a customized peer group of three companies that includes: International Paper Company, WestRock Company, and Domtar Corporation. The graph tracks the performance of a $100 investment (including the reinvestment of all dividends) in our common stock, in each index, and in each peer group's common stock from December 31, 2015 through December 31, 2020. The stock price performance included in this graph is not necessarily indicative of future stock price performance.

	Cumulative Total Return
	December 31,
	2015		2016		2017		2018		2019		2020
Packaging Corporation of America	$	100.00	$	139.09	$	202.37	$	143.96	$	199.16	$	253.47
S&P 500		100.00		111.96		136.40		130.42		171.49		203.04
S&P Midcap 400		100.00		120.74		140.35		124.80		157.49		179.00
Peer Group		100.00		136.61		163.30		111.72		132.91		144.12

The information in the graph and table above is not deemed “filed” with the Securities and Exchange Commission and is not to be incorporated by reference in any of PCA’s filings under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date of this Annual Report on Form 10-K, except to the extent that PCA specifically incorporates such information by reference.

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Item 6. SELECTED FINANCIAL DATA

The following table sets forth selected historical financial data of PCA (dollars and shares in millions, except per share data). The information contained in the table should be read in conjunction with the disclosures in “Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations” and “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K.

	Year Ended December 31,
	2020		2019		2018		2017		2016
Statement of Income Data (a):
Net sales	$	6,658.2	$	6,964.3	$	7,014.6	$	6,444.9	$	5,779.0
Net income		461.0		696.4		738.0		668.6		449.6
Net income per common share:
— basic		4.86		7.36		7.82		7.09		4.76
— diluted		4.84		7.34		7.80		7.07		4.75
Weighted average common shares outstanding:
— basic		94.1		93.8		93.7		93.5		93.5
— diluted		94.4		94.1		93.9		93.7		93.7
Cash dividends declared per common share		3.37		3.16		3.00		2.52		2.36
Balance Sheet Data (a):
Total assets	$	7,433.2	$	7,235.8	$	6,569.7	$	6,197.5	$	5,777.0
Total long-term obligations (b)		2,495.4		2,494.3		2,502.7		2,650.7		2,667.4
Stockholders' equity		3,246.3		3,071.0		2,672.4		2,182.6		1,759.8

(a) Effective January 1, 2019, the Company adopted ASU 2016-02 (Topic 842): Leases, which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under the previous guidance. We elected to apply this guidance as of its effective date and did not restate comparative periods. See Note 2, Summary of Significant Accounting Policies, and Note 3, Leases, for more information.

Effective January 1, 2016, the Company adopted Accounting Standards Update (ASU) 2015-03 (Topic 835): Simplifying the Presentation of Debt Issuance Costs. We applied this guidance retrospectively, as required, and reclassified the debt issuance costs from “Other long-term assets” to “Long-term debt” on our Consolidated Balance Sheet to conform with current period presentation. Total assets for all periods presented have been updated to reflect this adoption.

Net income and net income per common share are impacted by a lower U.S. corporate federal statutory income tax rate of 21% in 2020, 2019, and 2018 and 35% in all prior years presented in this table. In addition, both 2018 and 2017 include a tax benefit of $2.0 million and $122.1 million, respectively, related to the enactment in December 2017 of the Tax Cuts and Jobs Act (H.R.1). See Note 7, Income Taxes, for more information.

(b) Includes long-term debt and finance lease obligations.

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Item 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of historical results of operations and financial condition should be read in conjunction with the audited financial statements and the notes thereto which appear elsewhere in this Form 10-K. This discussion includes forward-looking statements regarding our expectations with respect to our future performance, liquidity, and capital resources. Such statements, along with any other non-historical statements in the discussion, are forward-looking. See our discussion regarding forward-looking statements included under “Part I, Item 1A. Risk Factors” of this Form 10-K. For our discussion and analysis of our results of operations, financial condition and cash flows for the year ended December 31, 2018, the earliest of the years presented in the accompanying audited financial statements included in Item 8 herein, please refer to our Annual Report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission on February 26, 2020. Such information is presented in Item 7 of such report under the subcaptions “Results of Operations —Year Ended December 31, 2019, Compared with Year Ended December 31, 2018” and “Liquidity and Capital Resources” and is incorporated by reference herein.

Overview

PCA is the third largest producer of containerboard products and the third largest producer of uncoated freesheet paper in North America. We operate six containerboard mills, two paper mills, and 90 corrugated products manufacturing plants. Our containerboard mills produce linerboard and corrugating medium, which are papers primarily used in the production of corrugated products. Our corrugated products manufacturing plants produce a wide variety of corrugated packaging products, including conventional shipping containers used to protect and transport manufactured goods, multi-color boxes and displays with strong visual appeal that help to merchandise the packaged product in retail locations, and honeycomb protective packaging. In addition, we are a large producer of packaging for meat, fresh fruit and vegetables, processed food, beverages, and other industrial and consumer products. We also manufacture and sell UFS papers, including both commodity and specialty papers, which may have custom or specialized features such as colors, coatings, high brightness, and recycled content. We are headquartered in Lake Forest, Illinois and operate primarily in the United States.

Executive Summary

Net sales were $6.66 billion for the year ended December 31, 2020 and $6.96 billion in 2019. We reported $461 million of net income, or $4.84 per diluted share, in 2020, compared to $696 million, or $7.34 per diluted share, in 2019. Net income included $89 million of expense for special items in 2020, compared to $29 million of expense for special items in 2019. Special items in both periods are described later in this section. Excluding special items, we recorded $550 million of net income, or $5.78 per diluted share, in 2020, compared to $726 million, or $7.65 per diluted share, in 2019. The decrease was driven primarily by lower prices and mix in our Packaging and Paper segments, lower volumes in our Paper segment, higher freight and logistic expense, and higher annual outage expense, partially offset by higher volumes in our Packaging segment, and lower operating and converting costs. For additional detail on special items included in reported GAAP results, as well as segment income (loss) excluding special items, earnings before non-operating pension expense, interest, income taxes, and depreciation, amortization, and depletion (EBITDA), and EBITDA excluding special items, see “Item 7. Reconciliations of Non-GAAP Financial Measures to Reported Amounts.” PCA ended the year with $1.1 billion of cash and marketable debt securities and, including borrowing availability under its revolving credit facility, $1.4 billion in liquidity.

The Company was committed to conducting safe operations through the COVID-19 pandemic during the year in adherence with the guidelines of the Center for Disease Control and applicable health and safety regulations. As PCA’s operations continued to operate as “essential businesses,” we adopted measures to protect the health and safety of our employees, including social distancing practices, enhanced sanitation procedures and modified absence pay policies. These practices will continue into 2021 as the effects of the pandemic continue. PCA did not experience significant disruptions in its operations as a result of the pandemic and has maintained adequate availability of its workforce and supply of raw materials and services to continue to serve its customers.

Packaging segment income from operations was $830 million in 2020, compared to $963 million in 2019. Packaging segment EBITDA excluding special items was $1,229 million in 2020, compared to $1,310 million in 2019. The decrease was driven primarily by lower containerboard and corrugated prices and mix, partially offset by higher sales and production volumes, lower operating and converting costs, lower annual outage expense, and lower freight and logistic expenses. Demand for Packaging segment products remained strong throughout the year, with our corrugated products shipments up 5.8% over 2019 (an increase of 5.4% on a per day basis as 2020 had one more operating day than 2019) and is expected to remain strong into the first quarter of 2021. We notified our customers of increased prices on our containerboard and corrugated products

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during the fourth quarter of 2020. We expect to incur some inflation in freight, labor, energy and fiber costs into the first quarter of 2021.

Paper segment loss from operations was $20 million in 2020, compared to income of $175 million in 2019. Paper segment EBITDA excluding special items was $73 million in 2020, compared to $213 million in 2019. The decrease was due primarily to lower sales and production volumes, lower paper prices and mix, higher annual outage expense, and higher freight and logistic expenses, partially offset by lower operating costs. Sales were 30% lower than last year, as demand for our paper products has continued to be negatively affected by the COVID-19 pandemic due to office and school closures. As described in Note 8, Goodwill and Intangible Assets included in Item 8 of this Annual Report on Form 10-K, we incurred a charge of $55.2 million during the year associated with the full impairment of goodwill within the Paper segment.

Operations at our Jackson, Alabama mill were idled for the majority of the second and third quarters of 2020. During the fourth quarter of 2020, due to an increase in demand for our corrugated products and as part of our assessment of a potential conversion to produce containerboard, we began producing high-performance, virgin kraft linerboard on the No. 3 machine at our Jackson mill. Before October 2020, operating results for the Jackson mill were included in the Paper segment. Beginning in October 2020, operating results for the Jackson mill are included in both the Packaging and Paper segments. We expect to continue to produce containerboard on the Jackson machine during the first quarter of 2021 to fulfill the needs of our packaging customers, as well as produce uncoated freesheet to service our paper customers.

During the second quarter of 2018, the Company discontinued production of paper grades at its Wallula, Washington mill and converted the No. 3 paper machine to a virgin kraft linerboard machine. The Company incurred charges in the Packaging and Paper segments relating to these activities during 2019 as described below under “Special Items and Earnings per Diluted Share, Excluding Special Items.”

Special Items and Earnings per Diluted Share, Excluding Special Items

Earnings per diluted share, excluding special items, in 2020 and 2019 were as follows:

	Year Ended December 31,
	2020		2019
Earnings per diluted share	$	4.84	$	7.34
Special items:
Goodwill impairment (a)		0.58		—
Facilities closure and other costs (b)		0.23		—
Hurricane Laura impact (c)		0.08		—
Incremental costs for COVID-19 (d)		0.05		—
Debt refinancing (e)		—		0.28
DeRidder mill fixed asset disposals (f)		—		0.02
Wallula mill restructuring (g)		—		0.01
Total special items expense		0.94		0.31
Earnings per diluted share, excluding special items	$	5.78	$	7.65

(a) During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.

(b) Includes $28.1 million of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility during the second quarter of 2020.

(c) Includes $10.0 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.

(d) Includes $6.9 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the

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process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(e) Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included premiums paid to redeem the debt being refinanced and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs. Also includes $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks in connection with the debt refinancing.

(f) Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

(g) Includes $1.0 million of charges related to the discontinuation of uncoated free sheet and coated one-side paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

Management excludes special items, as it believes these items are not necessarily reflective of the ongoing results of operations of our business. We present these measures because they provide a means to evaluate the performance of our segments and our company on an ongoing basis using the same measures that are used by our management, because these measures assist in providing a meaningful comparison between periods presented and because these measures are frequently used by investors and other interested parties in the evaluation of companies and the performance of their segments. A reconciliation of diluted earnings per share to diluted earnings per share excluding special items is included above and the reconciliations of other non-GAAP measures used in this Management's Discussion and Analysis of Financial Condition and Results of Operations, to the most comparable measure reported in accordance with GAAP, are included later in Item 7 under “Reconciliations of Non-GAAP Financial Measures to Reported Amounts.” Any analysis of non-GAAP financial measures should be done in conjunction with results presented in accordance with GAAP. The non-GAAP measures are not intended to be substitutes for GAAP financial measures and should not be used as such.

Industry and Business Conditions

Trade publications reported North American industry-wide corrugated products shipments per workday were up 3.0% during 2020, compared to 2019. Reported industry containerboard production increased 3.6% compared to 2019, and reported industry containerboard inventories at the end of 2020 were approximately 2.3 million tons, down 8.9% compared to 2019. Reported containerboard export shipments increased 9.0% compared to 2019. Prices reported by trade publications decreased by $10 per ton for linerboard and $15 per ton for corrugating medium in January 2020, followed by a $50 per ton increase in linerboard and medium in November 2020.

The market for communication papers competes heavily with electronic data transmission and document storage alternatives. Increasing shifts to these alternatives have reduced usage of traditional print media and communication papers. Trade publications reported North American uncoated freesheet paper shipments were down 20.1% in 2020, compared to 2019. Average copy paper prices reported by a trade publication for cut size office papers decreased $15 per ton in May 2020 and $20 per ton in June 2020.

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Results of Operations

Year Ended December 31, 2020, Compared with Year Ended December 31, 2019

The historical results of operations of PCA for the years ended December 31, 2020 and 2019 are set forth below (dollars in millions):

	Year Ended December 31,
	2020			2019			Change
Packaging	$	5,919.5		$	5,932.2		$	(12.7	)
Paper		674.8			964.3			(289.5	)
Corporate and other and eliminations		63.9			67.8			(3.9	)
Net sales	$	6,658.2		$	6,964.3		$	(306.1	)
Packaging	$	829.5		$	963.4		$	(133.9	)
Paper		(20.0	)		175.4			(195.4	)
Corporate and other		(85.6	)		(85.1	)		(0.5	)
Income from operations		723.9			1,053.7			(329.8	)
Non-operating pension income (expense)		2.3			(7.9	)		10.2
Interest expense, net		(93.5	)		(128.8	)		35.3
Income before taxes		632.7			917.0			(284.3	)
Income tax expense		(171.7	)		(220.6	)		48.9
Net income	$	461.0		$	696.4		$	(235.4	)
Net income excluding special items (a)	$	550.0		$	725.5		$	(175.5	)
EBITDA (a)	$	1,133.9		$	1,441.2		$	(307.3	)
EBITDA excluding special items (a)	$	1,225.0		$	1,445.2		$	(220.2	)

(a) See “Reconciliations of Non-GAAP Financial Measures to Reported Amounts” included in this Item 7 for a reconciliation of non-GAAP measures to the most comparable GAAP measure.

Net Sales

Net sales decreased $306 million, or 4.4%, to $6,658 million in 2020, compared to $6,964 million in 2019.

Packaging. Net sales decreased $13 million, or 0.2%, to $5,919 million, compared to $5,932 million in 2019, due to lower prices and mix ($298 million), partially offset by increased volumes ($285 million), primarily due to strong corrugated products demand and shipments. In 2020, our domestic containerboard prices decreased 5.9% and export prices decreased 11.5% compared to 2019. Our containerboard outside shipments decreased 5.8%, and total corrugated products shipments were up 5.8% in total and 5.4% per workday, compared to 2019. Prices reported by trade publications, which serve as an index for prices for our corrugated products in many of our customer contracts, decreased by $10 per ton for linerboard and $15 per ton for corrugating medium in January, followed by a $50 per ton increase in linerboard and medium in November 2020.

Paper. Net sales decreased $289 million, or 30.0%, to $675 million, compared to $964 million in 2019. The decrease was due to lower volume ($262 million) and prices and mix ($27 million), as demand was harmed by the COVID-19 pandemic due to office and school closures.

Gross Profit

Gross profit decreased $275 million in 2020, compared to 2019. The decrease was driven primarily by lower prices and mix in our Packaging and Paper segments, lower volumes in our Paper segment, higher freight and logistic expense, and higher annual outage expense, partially offset by higher volumes in our Packaging segment, and lower operating and converting costs.  In 2020, gross profit included $21 million of special item expense related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, incremental out-of-pocket costs related to COVID-19, and facility closure costs, compared to no significant special items in 2019.

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Selling, General, and Administrative Expenses

Selling, general, and administrative expenses (SG&A) decreased $18 million in 2020, compared to 2019. The decrease was primarily due to lower travel and entertainment expenses and lower administrative and other corporate costs, partially offset by higher employee salaries and fringes.

Goodwill Impairment

During 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55 million. For more information, see Note 8, Goodwill and Intangible Assets, of the Condensed Notes to the Consolidated Financial Statements in “Part II, Item 8. Financial Statements” of this Form 10-K.

Other Expense, Net

Other expense, net for the years ended December 31, 2020 and 2019 are set forth below (dollars in millions):

	Year Ended December 31,
	2020			2019
Asset disposals and write-offs	$	(26.5	)	$	(25.0	)
Facilities closure and other costs		(19.1	)		(0.3	)
Wallula mill restructuring		—			(0.7	)
Other		(5.1	)		(6.7	)
Total	$	(50.7	)	$	(32.7	)

We discuss these items in more detail in Note 6, Other Expense, Net of the Condensed Notes to the Consolidated Financial Statements in “Part II, Item 8. Financial Statements” of this Form 10-K.

Income from Operations

Income from operations decreased $330 million, or 31.3%, for the year ended December 31, 2020, compared to 2019. Income from operations in 2020 included $100 million of expense for special items compared to $4 million in 2019. Special items in 2020 consisted of $55 million of expense for the Paper reporting unit goodwill impairment; $28 million of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities; $10 million related to the impact of Hurricane Laura at our DeRidder, Louisiana mill; and $7 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. 2019 special items included $3 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill and $1 million of charges related to the conversion of the Wallula, Washington mill No. 3 paper machine.

Packaging. Segment income from operations decreased $134 million to $829 million, compared to $963 million in 2019. The decrease in 2020 related primarily to lower containerboard and corrugated products prices and mix ($246 million) and higher depreciation expense ($14 million), partially offset by higher containerboard and corrugated products sales and production volumes ($90 million), lower operating and converting costs ($55 million), lower annual outage expense ($5 million), lower freight expense ($4 million) and other fixed costs ($10 million). Special items in 2020 included expense of $27 million of closure costs for corrugated products facilities, $10 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, and $6 million of incremental, out-of-pocket costs related to COVID-19. Special items in 2019 included $3 million for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill and $1 million of charges related to the conversion of the Wallula No. 3 paper machine.

Paper. Segment income from operations decreased $195 million to a loss of $20 million, compared to income of $175 million in 2019. The decrease primarily related to lower sales and production volumes ($130 million), lower paper prices and mix ($27 million), higher annual outage expense ($11 million), and higher freight expense ($11 million), partially offset by lower operating costs ($39 million), and lower depreciation expense ($1 million). Special items in the Paper segment in 2020 included $55 million related to goodwill impairment, $1 million of restructuring costs for paper administrative functions, and $1 million of incremental, out-of-pocket costs related to COVID-19, compared to an insignificant amount of special items in the Paper segment in 2019.

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Non-Operating Pension Expense, Interest Expense, Net and Income Taxes

During 2020, non-operating pension expense decreased $10 million compared to 2019. The decrease in non-operating pension expense was primarily related to the favorable 2019 asset performance, partially offset by assumption changes.

Interest expense, net, during 2020 decreased $35 million compared to 2019. The decrease is primarily related to higher interest expense during 2019 as a result of the Company’s November 2019 debt refinancing, partially offset by lower interest income due to lower rates on invested cash balances in 2020.

During 2020, we recorded $172 million of income tax expense, compared with $221 million of income tax expense during 2019. The effective tax rate for 2020 and 2019 was 27.1% and 24.1%, respectively.

Liquidity and Capital Resources

Sources and Uses of Cash

Our primary sources of liquidity are net cash provided by operating activities and available borrowing capacity under our revolving credit facility. We ended the year with $975 million of cash and cash equivalents, $148 million of marketable debt securities, and $326 million of unused borrowing capacity under the revolving credit facility, net of letters of credit. Currently, our primary uses of cash are for operations, capital expenditures, acquisitions, debt service, common stock dividends, and repurchases of common stock. We believe that net cash generated from operating activities, cash on hand, available borrowings under our revolving credit facility and available capital through access to capital markets will be adequate to meet our liquidity and capital requirements, including payments of any declared common stock dividends, for the foreseeable future. As our debt or credit facilities become due, we will need to repay, extend or replace such facilities. Our ability to do so will be subject to future economic conditions and financial, business, and other factors, many of which are beyond our control.

Below is a summary table of our cash flows, followed by a discussion of our sources and uses of cash through operating activities, investing activities, and financing activities (dollars in millions):

	Year Ended December 31,
	2020			2019
Net cash provided by (used for):
Operating activities	$	1,032.8		$	1,207.4
Investing activities		(426.1	)		(546.6	)
Financing activities		(311.6	)		(342.8	)
Net increase in cash and cash equivalents	$	295.1		$	318.0

Operating Activities

Our operating cash flow is primarily driven by our earnings and changes in operating assets and liabilities, such as accounts receivable, inventories, accounts payable and other accrued liabilities, as well as other factors described below. Cash requirements for operating activities are subject to PCA's operating needs and the timing of collection of receivables and payments of payables and expenses.

During 2020, net cash provided by operating activities was $1,033 million, compared to $1,207 million for 2019, a decrease of $174 million. Cash from operations excluding changes in cash used for operating assets and liabilities decreased $243 million, primarily due to lower income from operations as discussed above, as well as higher pension contributions made in 2020 compared to 2019 of $25 million. Cash increased by $69 million due to favorable changes in operating assets and liabilities, primarily due to the following:

a) an increase in accounts payable levels in 2020 compared to 2019 related to the timing of payments, and

b) lower Federal and state income taxes paid in 2020 compared to 2019, partially offset by a lower income tax provision in 2020 compared to 2019 due to lower income levels in 2020.

These favorable changes were partially offset by the following:

a) a smaller decrease in accounts receivable in 2020 compared to 2019 due to higher Packaging segment sales volumes in 2020, partially offset by lower Paper segment sales volumes in 2020 as a result of the pandemic compared to 2019.

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Investing Activities

We used $426 million for investing activities in 2020, compared to $547 million in 2019. In 2020, we spent $421 million for internal capital investments, compared to $400 million in 2019. During both 2020 and 2019, we did not acquire any businesses. In 2020, we used $3 million of cash-on-hand to purchase available-for-sale (AFS) marketable debt securities, net of redemptions, compared to $146 million in 2019.

The details of capital expenditures for property and equipment, excluding acquisitions, by segment for the years ended December 31, 2020 and 2019 are included in the table below (dollars in millions).

	Year Ended December 31,
	2020		2019
Packaging	$	395.2	$	367.4
Paper		19.7		23.8
Corporate and Other		6.3		8.3
	$	421.2	$	399.5

We expect capital investments in 2021 to be between $500 million and $525 million, excluding capital spending related to the potential conversion of the No. 3 paper machine to containerboard at our Jackson mill. These expenditures could increase or decrease as a result of a number of factors, including our financial results, strategic opportunities, future economic conditions, and our regulatory compliance requirements. We currently estimate capital expenditures to comply with environmental regulations will be about $20 million in 2021. Our estimated environmental expenditures could vary significantly depending upon the enactment of new environmental laws and regulations. For additional information, see “Environmental Matters” in this Management's Discussion and Analysis of Financial Condition and Results of Operations.

At December 31, 2020, the Company had commitments for capital expenditures of $304.2 million. The Company believes that cash-on-hand combined with cash flow from operations will be sufficient to fund these commitments.

Financing Activities

In 2020, net cash used for financing activities was $312 million, compared to $343 million of cash used for financing activities in 2019, a decrease of $31 million. We paid $300 million in dividends on our common stock in 2020, compared to $299 million paid in 2019. In 2019, we refinanced $900 million principal amount of our long term debt. Payments to redeem our old debt, including redemption premiums, exceeded the proceeds received from issuing the new debt by $27 million. We also paid $8 million of debt issuance costs. See Note 10 to the Consolidated Financial Statements included in Item 8 of this Annual Report on Form 10-K for more information on the debt refinancing.

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Commitments

Contractual Obligations

The table below sets forth our enforceable and legally binding obligations as of December 31, 2020 for the categories described below. Some of the amounts included in the table are based on management's estimates and assumptions about these obligations, including their duration, the possibility of renewal, anticipated actions by third parties, and other factors. Because these estimates and assumptions are necessarily subjective, our actual payments may vary from those reflected in the table. Purchase orders made in the ordinary course of business are excluded from the table below. Any amounts for which we are liable under purchase orders are reflected on the Consolidated Balance Sheets as accounts payable and accrued liabilities (dollars in millions):

	Payments Due by Period
			Less Than 1 Year		1-3 Years		3-5 Years		More Than  5 Years
	Total		2021		2022-2023		2024-2025		2026 & After
4.50% Senior Notes, due November 2023	$	700.0	$	—	$	700.0	$	—	$	—
3.65% Senior Notes, due September 2024		400.0		—		—		400.0		—
3.40% Senior Notes, due December 2027		500.0		—		—		—		500.0
3.00% Senior Notes, due December 2029		500.0		—		—		—		500.0
4.05% Senior Notes, due December 2049		400.0		—		—		—		400.0
Total long-term debt (a)		2,500.0		—		700.0		400.0		1,400.0
Interest on long-term debt (b)		876.7		94.3		188.6		111.0		482.8
Finance lease obligations, including interest		20.5		2.7		5.4		5.4		7.0
Operating leases (c)		269.7		76.7		101.2		51.4		40.4
Capital commitments		304.2		304.2		—		—		—
Purchase commitments:
Raw materials (d)		252.8		40.0		83.2		52.4		77.2
Energy related (e)		30.8		13.5		12.9		1.8		2.6
Other liabilities reflected on our Consolidated Balance    Sheet (f):
Compensation and benefits (g)		300.6		61.9		128.4		43.0		67.3
Other (h)		68.8		12.3		8.7		2.6		45.2
	$	4,624.1	$	605.6	$	1,228.4	$	667.6	$	2,122.5

(a) The table assumes our long-term debt is held to maturity. See Note 10, Debt, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K. Amounts reported are gross amounts and do not include unamortized debt discounts of $6.3 million at December 31, 2020.

(b) Amounts represent estimated future interest payments as of December 31, 2020, assuming our long-term debt is held to maturity. All interest rates are fixed.

(c) We enter into operating leases for real estate and equipment in the normal course of business. Some lease agreements provide us with the option to renew the lease or purchase the leased property. In calculating our future operating lease obligations, we include the obligations associated with the non-cancellable period of the lease along with all the additional obligations covered by an option to extend the lease, if we are reasonably certain to exercise that option. The exercising of lease renewal options is based on whether future economic benefit is expected to be derived from the lease renewal.

(d) Included among our raw materials purchase obligations are contracts to purchase approximately $245.4 million of wood fiber. Purchase prices under most of these agreements are set quarterly, semiannually, or annually based on regional market prices, and the estimate is based on contract terms or first quarter 2021 pricing. Except for deposits required pursuant to wood supply contracts, these obligations are not recorded in our consolidated financial statements until contract payment terms take effect. Our log, fiber, and wood chip obligations are subject to change based on, among other things, the effect of governmental laws and regulations, disruptions to our manufacturing operations, and log and fiber availability.

(e) We enter into utility contracts for the purchase of electricity and natural gas. We also purchase these services under utility tariffs. The contractual and tariff arrangements include multiple-year commitments and minimum annual purchase requirements. Our payment obligations were based upon prices in effect on December 31, 2020, or contract language, if available.

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(f) Long-term deferred income taxes of $379.4 million and unrecognized tax benefits of $5.9 million, including interest and penalties, are excluded from this table, because the timing of their future cash outflows are uncertain.

(g) Amounts primarily consist of pension and postretirement obligations. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K, for additional information.

(h) Amounts primarily consist of workers compensation, environmental, and asset retirement obligations.

Off-Balance Sheet Arrangements

The Company does not have any off-balance sheet arrangements as of December 31, 2020.

Inflation and Other General Cost Increases

We are subject to both contractual, inflation, and other general cost increases. If we are unable to offset these cost increases by price increases, growth, and/or cost reductions in our operations, these inflation and other general cost increases could have a material adverse effect on our operating cash flows, profitability, and liquidity.

In 2020, our total company costs including cost of sales (COS) and selling, general, and administrative expenses (SG&A) was $5.8 billion, and excluding non-cash costs (depreciation, depletion and amortization, pension and postretirement expense, and share-based compensation expense) was $5.4 billion. A 1% increase in COS and SG&A costs would increase costs by $58 million and cash costs by $54 million.

Certain items of product input costs have historically been subject to more cost volatility including fiber, purchased energy, and chemicals.

Energy

In 2020, our mills, including both packaging and paper mills, consumed about 93 million MMBTUs of fuel, including internally generated and externally purchased, to produce both steam and electricity. The following table for 2020 provides the total MMBTUs purchased externally by fuel type each quarter and the average cost per MMBTU by fuel type for the year. Our mills represent about 90% of our total purchased fuel costs. The cost per MMBTU includes the cost of the fuel plus our transportation and delivery costs.

	2020 Fuel Purchased (millions of MMBTUs)										2020 Avg.
Fuel Type	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Full Year		Cost / MMBTU
Natural gas		7.40		5.66		5.41		7.29		25.76	$	3.00
Purchased bark		1.87		1.60		1.22		1.43		6.12		2.31
Other purchased fuels		0.18		0.15		0.13		0.17		0.63		4.86
Total mills		9.45		7.41		6.76		8.89		32.51	$	2.91

In addition, the mills purchased 22.64 million CkWh (hundred kilowatt-hours) of electricity in 2020. The purchases by quarter and the average cost per CkWh were as follows:

	2020 Purchased Electricity (millions of CkWh)										2020 Avg.
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Full Year		Cost / CkWh
Purchased electricity		6.30		5.27		5.08		5.99		22.64	$	5.01

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Regulatory and Environmental Matters

Our operations are subject to our compliance with the laws and regulations in the jurisdictions in which we operate, primarily in the United States. Of particular importance are laws and regulations relating to the environment and health and safety matters.

Environmental compliance requirements are a significant factor affecting our business. We employ processes in the manufacture of containerboard, paper, and pulp, which result in various discharges, emissions and waste disposal. These processes are subject to numerous federal, state, local and foreign environmental laws and regulations. We operate and expect to continue to operate, under environmental permits and similar authorizations from various governmental authorities that regulate such discharges, emissions, and waste disposal. The most significant of these laws affecting the Company are:

• Resource Conservation and Recovery Act (RCRA);

• Clean Water Act (CWA);

• Clean Air Act (CAA);

• The Emergency Planning and Community Right-to-Know-Act (EPCRA);

• Toxic Substance Control Act (TSCA); and

• Safe Drinking Water Act (SDWA).

We believe that we are currently in material compliance with these and all applicable environmental rules and regulations. Because environmental regulations are constantly evolving, the Company has incurred, and will continue to incur, costs to maintain compliance with these and other environmental laws. The Company works diligently to anticipate and budget for the impact of applicable environmental regulations, and does not currently expect that future environmental compliance obligations will materially affect its business or financial condition. For the years ended December 31, 2020, 2019, and 2018, we spent $44 million, $41 million, and $40 million, respectively, to comply with the requirements of these and other environmental laws. Additionally, we had $9 million of environmental capital expenditures in both 2020 and 2019 and $7 million in 2018.

In January 2013, the U.S. Environmental Protection Agency (the “EPA”) established a three-year deadline for compliance with the Boiler MACT regulations, establishing air emissions standards and certain other requirements for industrial boilers. PCA's compliance actions involved modifying or replacing certain boilers, and all PCA mills are in full compliance with Boiler MACT requirements. On July 29, 2016, the U.S. Court of Appeals for the District of Columbia Circuit issued a ruling on the consolidated cases challenging Boiler MACT. The court vacated key portions of the rule, including emission limits for certain subcategories of solid fuel boilers, and remanded issues to the EPA for further rulemaking. At this time, we cannot predict with certainty how this decision will impact our existing Boiler MACT compliance efforts or whether we will incur additional costs to comply with any revised standards.

As is the case with any industrial operation, PCA has, in the past, incurred costs associated with the remediation of soil or groundwater contamination, as required by the federal Comprehensive Environmental Response, Compensation and Liability Act, commonly known as the federal “Superfund” law, and analogous state laws. Cleanup requirements arise with respect to properties the Company currently owns or operates, former facilities and off-site facilities where the Company has disposed of hazardous substances. As part of the sale to PCA of the containerboard and corrugated products business of Pactiv Corporation in April 1999, Pactiv agreed to retain all liability for all former facilities and all sites associated with pre-closing off-site waste disposal. Pactiv also retained environmentally impaired real property in Filer City, Michigan unrelated to current mill operations. In addition, OfficeMax (now an indirect, wholly owned subsidiary of Office Depot) retains responsibility for certain environmental liabilities related to some of the businesses, facilities, and assets we acquired from Boise. Generally, this responsibility relates to hazardous substance releases and other environmental incidents that arose before 2004. Some of these liabilities could be significant; however, Office Depot may not have sufficient funds to satisfy its indemnification obligations, and in some cases, we may not be entitled to such indemnification.

Because liability for remediation costs under environmental laws is strict, meaning that liability is imposed without fault, joint and several, meaning that liability is imposed on each party without regard to contribution, and retroactive, PCA could receive notifications of cleanup liability in the future and this liability could be material. From 2006 through 2020, there were no significant environmental remediation costs at PCA's mills and corrugated plants. As of December 31, 2020, we maintained an environmental reserve of $23.6 million relating to on-site landfills and surface impoundments as well as ongoing and anticipated remedial projects. The Company believes that it is not reasonably possible that future environmental expenses above the $23.6 million accrued at December 31, 2020, will have a material impact on its financial condition, results of operations, and cash flows.

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While legislation regarding the regulation of greenhouse gas emissions has been proposed at the federal level, it is uncertain whether such legislation will be passed and, if so, what the breadth and scope of such legislation will be. The result of the regulation of greenhouse gas emissions could be an increase in our future environmental compliance costs, through caps, taxes or additional capital expenditures to modify facilities, which may be material. However, climate change legislation and the resulting future energy policy could also provide us with opportunities if the use of renewable energy is encouraged. We currently self-generate the majority of our power requirements at our mills using bark, black liquor and biomass as fuel, which are derived from renewable resources. While we believe we are well-positioned to take advantage of any renewable energy incentives, it is uncertain what the ultimate costs and opportunities of any climate change legislation will be and how our business and industry will be affected.

We are also subject to extensive federal, state and local laws related to workplace health and safety, and our safety management system includes measures to assure compliance with these laws and regulations. We do not believe that future compliance with health and safety laws and regulations will have a material adverse effect on our financial condition, results of operations or cash flows.

Critical Accounting Policies and Estimates

Management’s discussion and analysis of financial condition and results of operations are based upon the Company’s consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent assets and liabilities. On an ongoing basis, PCA evaluates its estimates, including those related to business combinations, goodwill and intangible assets, pensions and other postretirement benefits, environmental liabilities, income taxes, and long-lived asset impairment, among others. PCA bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Critical accounting estimates are those that are most important to the portrayal of our financial condition and results. These estimates require management's most difficult, subjective, or complex judgments. We review the development, selection, and disclosure of our critical accounting estimates with the Audit Committee of our Board of Directors. The Company believes that of its significant accounting policies, the following involve a higher degree of judgment and/or complexity:

Pensions

The Company accounts for defined benefit pension plans in accordance with Accounting Standards Codification (ASC) 715, Compensation - Retirement Benefits. The calculation of pension expense and pension liabilities requires decisions about a number of key assumptions that can significantly affect expense and liability amounts, including discount rates, expected return on plan assets, expected rate of compensation increases, longevity and service lives of participants, expected contributions, and other factors. The pension assumptions used to measure pension expense and liabilities are discussed in Note 12, Employee Benefit Plans and Other Postretirement Benefits.

We recognize the funded status of our pension plans on our Consolidated Balance Sheet and recognize the actuarial and experience gains and losses and the prior service costs and credits as a component of “Accumulated Other Comprehensive Loss” in our Consolidated Statement of Changes in Stockholders' Equity. Actual results that differ from assumptions are accumulated and amortized over future periods and, therefore, generally affect recognized expense in future periods. At December 31, 2020, we had approximately $144.2 million of actuarial losses and prior service costs, net of tax, recorded in “Accumulated other comprehensive loss” on our Consolidated Balance Sheet. Accumulated losses in excess of 10% of the greater of the projected benefit obligation or the market-related value of assets will be recognized on a straight-line basis over the average remaining service period of active employees in PCA plans (which is between seven and nine years) and over the average remaining lifetime of inactive participants of Boise plans (which is between 23 and 26 years), to the extent that losses are not offset by gains in subsequent years. While we believe that the assumptions used to measure our pension obligations are reasonable, differences in actual experience or changes in assumptions may materially affect our pension obligations and future expense.

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We believe that the accounting estimate related to pensions is a critical accounting estimate because it is highly susceptible to change from period to period. As discussed above, the future effects of pension plans on our financial position and results of operations will depend on economic conditions, employee demographics, mortality rates, retirement rates, investment performance, and funding decisions, among other factors. The following table presents selected assumptions used and expected to be used in the measurement of pension expense in the following periods (dollars in millions):

	Year Ending December 31,			Year Ended December 31,
	2021			2020			2019
Pension expense	$	2.1		$	21.1		$	32.7
Assumptions
Discount rate		2.57	%		3.25	%		4.31	%
Expected rate of return on plan assets		4.91	%		5.29	%		6.06	%

A change of 0.25% in either direction to the discount rate or the expected rate of return on plan assets would have had the following effect on 2020 and 2021 pension expense (dollars in millions):

			Increase (Decrease) in Pension Expense(a)
	Base Expense		0.25% Increase			0.25% Decrease
2020
Discount rate	$	21.1	$	(2.5	)	$	2.7
Expected rate of return on plan assets		21.1		(2.7	)		2.7
2021
Discount rate	$	2.1	$	(1.9	)	$	2.2
Expected rate of return on plan assets		2.1		(3.2	)		3.2

(a) The sensitivities shown above are specific to 2020 and 2021. The sensitivities may not be additive, so the impact of changing multiple factors simultaneously cannot be calculated by combining the individual sensitivities shown.

For more information related to our pension benefit plans, see Note 12, Employee Benefit Plans and Other Postretirement Benefits, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K.

Goodwill Impairment

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 December 31, 2020, we had $863.5 million of goodwill, all of which was recorded in the Packaging segment.

We test goodwill for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value.  

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit and performed an interim quantitative impairment analysis as of May 31, 2020. For additional information, see Note 8, Goodwill and Intangible Assets, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K.

Based on the evaluation performed, we determined that the carrying value of the Paper reporting unit exceeded its fair value, which resulted in a goodwill impairment charge totaling $55.2 million, the full amount of goodwill associated with the Paper reporting unit. At December 31, 2020, we had $0 million of goodwill recorded in the Paper segment.

Under ASU 2017-04 (Topic 350), Intangibles - Goodwill and Other – Simplifying the Test for Goodwill Impairment, companies are no longer required to determine the fair value of individual assets and liabilities of a reporting unit to measure goodwill impairment, thus eliminating Step Two of the analysis that was required under the prior guidance. Under ASU 2017-04, goodwill impairment testing is performed by comparing the fair value of the reporting unit with its carrying amount and

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recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The Company adopted this ASU prospectively beginning with its annual goodwill impairment test in the fourth quarter of 2017.

The update to the standard does not eliminate the optional qualitative assessment of goodwill impairment that is often used to determine if the quantitative assessment is necessary. The qualitative assessment requires the evaluation of certain events and circumstances such as macroeconomic conditions, industry and market considerations, cost factors and overall financial performance, as well as company and reporting unit specific items. If, after assessing these qualitative factors, the Company determines that it is more likely than not that the carrying value of the reporting unit is less than its fair value, then no further testing is required. Otherwise, the Company would perform a quantitative analysis.  

The quantitative analysis requires companies to compare the fair value of the reporting units to which goodwill was assigned to their respective carrying values. In calculating fair value, we use the income approach as our primary indicator of fair value. Under the income approach, we calculate the fair value of a reporting unit based on the present value of estimated future cash flows (Level 3 measurement). These estimates are based on a number of factors including industry experience, business expectations and the economic environment. If the fair value exceeds the carrying value, no further work is required and no impairment loss is recognized. If the carrying value exceeds the fair value, the goodwill of the reporting unit is potentially impaired, and the carrying value of goodwill is then reduced to the implied value, or to zero if the fair value of the assets exceeds the fair value of the reporting unit, through an impairment charge.

During the annual goodwill impairment test performed in the fourth quarter of 2020, we assessed qualitative factors to determine whether it was more likely than not that the fair value of the Packaging reporting unit was less than its carrying value. Based on the results of the qualitative impairment test, we determined that it was more likely than not that the carrying value was less than the fair value of the Packaging reporting unit.

If management's estimates of future operating results materially change or if there are changes to other assumptions, the estimated fair value of our goodwill could change significantly. Such change could result in impairment charges in future periods, which could have a significant noncash impact on our operating results and financial condition. We cannot predict the occurrence of future events that might adversely affect the reported value of our goodwill. As additional information becomes known, we may change our estimates.

Long-Lived Asset Impairment

An impairment of a long-lived asset exists when the carrying value of an asset is not recoverable through future undiscounted cash flows from operations and when the carrying value of the asset exceeds its fair value. Long-lived asset impairment is a critical accounting estimate, as it is susceptible to change from period to period.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of our long lived assets within our Paper segment, including property, plant, and equipment, and performed a recoverability test on the Paper reporting unit long lived assets as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long lived assets within our Paper segment, inclusive of property, plant, and equipment, were 100% recoverable.

We review the carrying value of long-lived assets, including intangible assets, for impairment when events or changes in circumstances indicate that the carrying amount of assets may not be recoverable. For purposes of testing for impairment, we group our long-lived assets at the lowest level for which identifiable cash flows are largely independent of the cash flows from other assets and liabilities. Our asset groupings vary based on the related business in which the long-lived asset is employed and the interrelationship between those long-lived assets in producing net cash flows. Asset groupings could change in the future if changes in the operations of the business or business environment affect the way particular long-lived assets are employed or the interrelationships between assets. To estimate whether the carrying value of an asset or asset group is impaired, we estimate the undiscounted cash flows that could be generated under a range of possible outcomes. To measure future cash flows, we are required to make assumptions about future production volumes, future product pricing, and future expenses to be incurred. In addition, estimates of future cash flows may change based on the availability of fiber, environmental requirements, capital spending, and other strategic management decisions. We estimate the fair value of an asset or asset group based on quoted market prices for similar assets and liabilities or inputs that are observable either directly (Level 1 measurement) or indirectly (the amount for which the asset(s) could be bought or sold in a current transaction with a third party) when available (Level 2 measurement). When quoted market prices are not available, we use a discounted cash flow model to estimate fair value (Level 3 measurement).

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We periodically assess the estimated useful lives of our assets. Changes in circumstances, such as changes to our operational or capital strategy, changes in regulation, or technological advances, may result in the actual useful lives differing from our estimates. Revisions to the estimated useful lives of assets requires judgment and constitutes a change in accounting estimate, which is accounted for prospectively by adjusting or accelerating depreciation and amortization rates. In 2020 and 2019, we recognized incremental depreciation expense of $4.5 million and $0.3 million, respectively. The incremental depreciation expense for 2020 related to closures of corrugated products facilities, while the incremental depreciation expense for 2019 primarily related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

New and Recently Adopted Accounting Standards

For a listing of our new and recently adopted accounting standards, see 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 this Form 10-K.

Reconciliations of Non-GAAP Financial Measures to Reported Amounts

Net income excluding special items, EBITDA, and EBITDA excluding special items are non-GAAP financial measures. Management excludes special items, as it believes that these items are not necessarily reflective of the ongoing operations of our business. These measures are presented because they provide a means to evaluate the performance of our segments and our Company on an ongoing basis using the same measures that are used by our management, because these measures assist in providing a meaningful comparison between periods and because these measures are frequently used by investors and other interested parties in the evaluation of companies and the performance of their segments. Any analysis of non-GAAP financial measures should be done in conjunction with results presented in accordance with GAAP. The non-GAAP measures are not intended to be substitutes for GAAP financial measures and should not be used as such. Reconciliations of the non-GAAP measures to the most comparable measure reported in accordance with GAAP for the years ended December 31, 2020 and 2019 follow (dollars in millions): 

	Year Ended December 31,
	2020							2019
	Income before Taxes		Income Taxes			Net Income		Income before Taxes		Income Taxes			Net Income
As reported in accordance with GAAP	$	632.7	$	(171.7	)	$	461.0	$	917.0	$	(220.6	)	$	696.4
Special items:
Facilities closure and other costs (a)		28.1		(7.0	)		21.1		0.3		(0.1	)		0.2
Goodwill impairment (b)		55.2		—			55.2		—		—			—
Hurricane Laura impact (c)		10.0		(2.5	)		7.5		—		—			—
Incremental costs for COVID-19 (d)		6.9		(1.7	)		5.2		—		—			—
Debt refinancing (e)		—		—			—		38.7		(12.8	)		25.9
DeRidder fixed asset disposals (f)		—		—			—		3.0		(0.7	)		2.3
Wallula mill restructuring (g)		—		—			—		1.0		(0.3	)		0.7
Total special items		100.2		(11.2	)		89.0		43.0		(13.9	)		29.1
Excluding special items	$	732.9	$	(182.9	)	$	550.0	$	960.0	$	(234.5	)	$	725.5

(a) For 2020, includes charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter, partially offset by income related to the sale of a corrugated products facility during the second quarter. For 2019, includes charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility.

(b) During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.

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(c) Includes charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.

(d) Includes incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(e) Includes charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs. Also includes income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks in connection with the debt refinancing.

(f) Includes charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

(g) Includes charges related to the discontinuation of uncoated free sheet and coated one-side paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

The following table reconciles net income to EBITDA and EBITDA excluding special items for the periods indicated (dollars in millions):

	Year Ended December 31,
	2020			2019
Net income	$	461.0		$	696.4
Non-operating pension (income) expense		(2.3	)		7.9
Interest expense, net		93.5			128.8
Provision for income taxes (a)		171.7			220.6
Depreciation, amortization, and depletion		410.0			387.5
EBITDA	$	1,133.9		$	1,441.2
Special items:
Facilities closure and other costs	$	19.0		$	0.3
Goodwill impairment		55.2			—
Hurricane Laura impact		10.0			—
Incremental costs for COVID-19		6.9			—
DeRidder mill fixed asset disposals		—			3.0
Wallula mill restructuring		—			0.7
EBITDA excluding special items	$	1,225.0		$	1,445.2

(a) Income tax expense for 2019 included a tax benefit of $3.2 million from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks in connection with the Company’s November 2019 debt refinancing.

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The following table reconciles segment income (loss) to EBITDA and EBITDA excluding special items (dollars in millions):

	Year Ended December 31,
	2020			2019
Packaging
Segment income	$	829.5		$	963.4
Depreciation, amortization, and depletion		365.2			342.8
EBITDA		1,194.7			1,306.2
Facilities closure and other costs		18.2			0.3
Hurricane Laura impact		10.0			—
Incremental costs for COVID-19		6.3			—
DeRidder mill fixed asset disposals		—			3.0
Wallula mill restructuring		—			0.5
EBITDA excluding special items	$	1,229.2		$	1,310.0
Paper
Segment income (loss)	$	(20.0	)	$	175.4
Depreciation, amortization, and depletion		36.5			37.7
EBITDA		16.5			213.1
Facilities closure and other costs		0.8			—
Goodwill impairment		55.2			—
Incremental costs for COVID-19		0.6			—
Wallula mill restructuring		—			0.2
EBITDA excluding special items	$	73.1		$	213.3
Corporate and Other
Segment loss	$	(85.6	)	$	(85.1	)
Depreciation, amortization, and depletion		8.3			7.0
EBITDA		(77.3	)		(78.1	)
EBITDA excluding special items	$	(77.3	)	$	(78.1	)
EBITDA	$	1,133.9		$	1,441.2
EBITDA excluding special items	$	1,225.0		$	1,445.2

Item 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

PCA is exposed to the impact of interest rate changes and changes in the market value of its financial instruments. PCA periodically enters into derivatives in order to minimize these risks, but not for trading purposes. We were not party to any derivative-based arrangements at December 31, 2020. For a discussion of derivatives and hedging activities, see Note 15, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of this Form 10-K.

At December 31, 2020, the interest rates on 100% of PCA’s outstanding debt are fixed.

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Item 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

INDEX TO FINANCIAL STATEMENTS

Packaging Corporation of America Consolidated Financial Statements
Reports of Independent Registered Public Accounting Firm	36
Consolidated Statements of Income and Comprehensive Income for the years ended December 31, 2020, 2019, and 2018	39
Consolidated Balance Sheets as of December 31, 2020 and 2019	40
Consolidated Statements of Cash Flows for the years ended December 31, 2020, 2019, and 2018	41
Consolidated Statement of Changes in Stockholders' Equity for the years ended December 31, 2020, 2019, and 2018	42
Notes to Consolidated Financial Statements	43

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and Board of Directors

Packaging Corporation of America:

Opinions on the Consolidated Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Packaging Corporation of America and subsidiaries (the Company) as of December 31, 2020 and 2019, the related consolidated statements of income and comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes (collectively, the consolidated financial statements). We also have audited the Company’s internal control over financial reporting as of December 31, 2020, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2020 and 2019, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2020, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2020 based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Change in Accounting Principle

As discussed in Note 2 to the consolidated financial statements, the Company has changed its method of accounting for leases as of January 1, 2019 due to the adoption of Accounting Standards Update 2016-02, Leases (Topic 842), and its subsequent amendments.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s consolidated financial statements and an opinion on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally

36

accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the consolidated financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of the critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Evaluation of the value of the pension benefit obligation

As discussed in Note 12 to the consolidated financial statements, the Company’s estimated pension benefit obligation totaled $1,566 million as of December 31, 2020. The pension benefit obligation is measured at the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered before that date. The determination of the Company’s pension benefit obligation is dependent, in part, on the selection of certain actuarial assumptions, including the discount rate.

We identified the evaluation of the value of the pension benefit obligation as a critical audit matter because of the specialized skills required to evaluate the measurement of the pension benefit obligation. In addition, the measurement of the pension benefit obligation is sensitive to minor changes in the discount rate assumption.

The following are primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s pension benefit obligation valuation process, including a control related to the development of the discount rate. We involved an actuarial professional with specialized skills and knowledge, who assisted in understanding and assessing the actuarial methods and assumptions used to measure the pension benefit obligation. In addition, the actuarial professional assisted with our evaluation of the discount rate by assessing:

•changes in the discount rate from the prior year against changes in published indices;

•the pattern of cash flows, including consideration of the plan type and plan provisions; and

•the selected yield curve and its consistency with the prior year and spot rates.

Goodwill impairment assessment

As discussed in Note 8 to the consolidated financial statements, the Company’s consolidated goodwill balance was $863.5 million as of December 31, 2020, which related to the Packaging reporting unit. Goodwill is tested for impairment annually in the fourth quarter of each fiscal year, or more frequently when events or changes in circumstances indicate that the carrying value of a reporting unit may exceed its fair value. During the second quarter of the year-ended December 31, 2020, the Company identified a triggering event and recorded a goodwill impairment loss of $55.2 million related to its Paper reporting unit. To estimate the fair value of the Paper reporting unit, the

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Company utilized a combination of the income approach and a market approach that used observable comparable company information.

We identified the evaluation of goodwill for impairment for the Paper reporting unit as a critical audit matter. Especially subjective and challenging auditor judgment was required to evaluate the Company’s estimated future cash flows, specifically the selection of forecasted revenue growth rates, gross profit margins, operating margins, and the discount rate used in the income approach.  Additionally, the audit effort associated with the evaluation of goodwill for impairment for the Paper reporting unit required the use of professionals with specialized skills and knowledge.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s goodwill impairment evaluation, including controls over the selection of forecasted revenue growth rates, gross profit margins, operating margins, and the discount rate used in the estimate of the fair value of the Paper reporting unit. We evaluated the reasonableness of management’s forecasted revenue growth rates, gross profit margins, and operating margins by comparing the forecasts to historical revenue growth rates, gross profit margins, and operating margins, and considering industry conditions and growth plans. We performed sensitivity analyses to assess the impact of reasonably possible changes to the forecasted revenue growth rates, gross profit margins, operating margins, and the discount rate assumptions on the reporting unit fair value. In addition, we involved valuation professionals with specialized skills and knowledge, who assisted in:

• evaluating the Company’s discount rate by comparing the Company’s discount rate inputs to publicly available data for comparable entities and assessing the results; and

• testing the estimate of fair value for the Paper reporting unit using the Company’s estimated future cash flows and discount rate and comparing the result to the Company’s fair value estimate.

/s/ KPMG LLP

We have served as the Company’s auditor since 2014.

Chicago, Illinois

February 24, 2021

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Packaging Corporation of America

Consolidated Statements of Income and Comprehensive Income

(dollars in millions, except per-share data)

	Year Ended December 31,
	2020			2019			2018
Statements of Income
Net sales	$	6,658.2		$	6,964.3		$	7,014.6
Cost of sales		(5,288.8	)		(5,320.3	)		(5,369.3	)
Gross profit		1,369.4			1,644.0			1,645.3
Selling and administrative expenses		(539.6	)		(557.6	)		(536.4	)
Goodwill impairment		(55.2	)		—			—
Other expense, net		(50.7	)		(32.7	)		(41.2	)
Income from operations		723.9			1,053.7			1,067.7
Non-operating pension income (expense)		2.3			(7.9	)		(2.1	)
Interest expense, net		(93.5	)		(128.8	)		(95.1	)
Income before taxes		632.7			917.0			970.5
Provision for income taxes		(171.7	)		(220.6	)		(232.5	)
Net income	$	461.0		$	696.4		$	738.0
Net income per common share:
Basic	$	4.86		$	7.36		$	7.82
Diluted	$	4.84		$	7.34		$	7.80
Dividends declared per common share	$	3.37		$	3.16		$	3.00
Statements of Comprehensive Income:
Net income	$	461.0		$	696.4		$	738.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	$	—		$	—		$	(0.1	)
Reclassification adjustments to cash flow hedges included in net    income, net of tax of $0.0 million, $7.9 million, and $1.3 million    for 2020, 2019, and 2018, respectively		—			10.2			4.0
Changes in unrealized gains on marketable debt securities,    net of tax of $0.1 million, $0.0 million, and $0.0 million for 2020,    2019, and 2018, respectively		0.3			—			—
Amortization of pension and postretirement plans actuarial loss and    prior service cost, net of tax of $3.6 million, $3.2 million, and $4.0    million for 2020, 2019, and 2018, respectively		10.7			9.6			11.8
Changes in unfunded employee benefit obligations, net of tax of    ($1.3) million, $13.6 million, and ($0.8) million     for 2020, 2019, and 2018, respectively		4.0			(40.5	)		2.4
Other comprehensive income (loss)		15.0			(20.7	)		18.1
Comprehensive income	$	476.0		$	675.7		$	756.1

See notes to consolidated financial statements.

39

Packaging Corporation of America

Consolidated Balance Sheets

(dollars and shares in millions, except per-share data)

	December 31,
	2020			2019
ASSETS
Current assets:
Cash and cash equivalents	$	974.6		$	679.5
Short-term marketable debt securities		105.6			87.9
Accounts receivable, net of allowance for credit losses and customer    deductions of $10.6 million and $12.6 million as of December 31, 2020 and    2019, respectively		832.4			845.6
Inventories		787.9			794.1
Prepaid expenses and other current assets		44.7			44.8
Federal and state income taxes receivable		5.1			26.5
Total current assets		2,750.3			2,478.4
Property, plant and equipment, net		3,193.4			3,151.7
Goodwill		863.5			918.7
Other intangible assets, net		295.9			338.8
Operating lease right-of-use assets		234.2			234.3
Long-term marketable debt securities		42.7			58.1
Other long-term assets		53.2			55.8
Total assets	$	7,433.2		$	7,235.8
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Operating lease obligations	$	68.9		$	62.6
Finance lease obligations		1.6			1.5
Accounts payable		387.0			351.9
Dividends payable		97.0			76.6
Accrued liabilities		216.2			217.5
Accrued interest		11.9			13.7
Total current liabilities		782.6			723.8
Long-term liabilities:
Long-term debt		2,479.4			2,476.8
Operating lease obligations		173.6			177.6
Finance lease obligations		14.4			16.0
Deferred income taxes		379.4			340.1
Compensation and benefits		298.3			375.5
Other long-term liabilities		59.2			55.0
Total long-term liabilities		3,404.3			3,441.0
Commitments and contingent liabilities
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized,    94.8 million and 94.7 million shares issued as of December 31, 2020 and    2019, respectively		0.9			0.9
Additional paid in capital		554.4			524.8
Retained earnings		2,835.5			2,704.8
Accumulated other comprehensive loss		(144.5	)		(159.5	)
Total stockholders' equity		3,246.3			3,071.0
Total liabilities and stockholders' equity	$	7,433.2		$	7,235.8

See notes to consolidated financial statements.

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Packaging Corporation of America

Consolidated Statements of Cash Flows

(dollars in millions)

	Year Ended December 31,
	2020			2019			2018
Cash Flows from Operating Activities:
Net income	$	461.0		$	696.4		$	738.0
Adjustments to reconcile net income to net cash provided by    operating activities:
Depreciation, depletion, and amortization of intangibles		409.9			387.5			410.9
Amortization of deferred financing costs		2.6			23.4			8.6
Loss on early extinguishment of debt		—			22.2			—
Share-based compensation expense		30.0			30.4			23.5
Deferred income tax provision		34.7			60.3			38.7
Goodwill impairment		55.2			—			—
Net loss on impairment of assets		—			—			3.1
Net loss on asset disposals		6.8			8.2			5.8
Pension and post-retirement benefits expense, net of contributions		(63.4	)		(26.9	)		3.1
Other, net		18.2			(3.4	)		1.3
Changes in operating assets and liabilities, net of acquisitions:
Decrease (increase) in assets —
Accounts receivable		13.2			56.4			(56.1	)
Inventories		6.3			1.4			(35.6	)
Prepaid expenses and other current assets		0.4			(6.9	)		(2.1	)
Increase (decrease) in liabilities —
Accounts payable		39.7			(32.4	)		(17.6	)
Accrued liabilities		(3.2	)		(0.1	)		5.5
Federal and state income tax payable / receivable		21.4			(9.1	)		53.0
Net cash provided by operating activities		1,032.8			1,207.4			1,180.1
Cash Flows from Investing Activities:
Additions to property, plant, and equipment		(421.2	)		(399.5	)		(551.4	)
Acquisitions of businesses, net of cash acquired		—			—			(56.3	)
Additions to other long-term assets		(6.4	)		(3.8	)		(4.5	)
Proceeds from asset disposals		4.6			4.1			1.5
Purchases of marketable debt securities		(110.1	)		(157.0	)		—
Proceeds from sales of marketable debt securities		24.2			10.9			—
Proceeds from maturities of marketable debt securities		82.8			—			—
Other, net		—			(1.3	)		2.5
Net cash used for investing activities		(426.1	)		(546.6	)		(608.2	)
Cash Flows from Financing Activities:
Proceeds from issuance of debt		—			895.8			—
Repayments of debt and finance lease obligations		(1.5	)		(923.4	)		(151.3	)
Financing costs paid		—			(8.3	)		—
Common stock dividends paid		(299.6	)		(298.7	)		(268.1	)
Shares withheld to cover employee restricted stock taxes		(10.5	)		(8.2	)		(7.9	)
Net cash used for financing activities		(311.6	)		(342.8	)		(427.3	)
Net increase in cash and cash equivalents		295.1			318.0			144.6
Cash and cash equivalents, beginning of year		679.5			361.5			216.9
Cash and cash equivalents, end of year	$	974.6		$	679.5		$	361.5

See notes to consolidated financial statements.

41

Packaging Corporation of America

Consolidated Statements of Changes in Stockholders' Equity

(dollars in millions and shares in thousands)

	Common Stock					Additional Paid in			Retained			Accumulated Other Comprehensive			Total Stockholders'
	Shares			Amount		Capital			Earnings			Loss			Equity
Balance at January 1, 2018		94,350		$	0.9	$	471.2		$	1,867.4		$	(156.9	)	$	2,182.6
Common stock withheld and retired to    cover taxes on vested stock awards		(69	)		—		(0.5	)		(7.4	)		—			(7.9	)
Common stock dividends declared		—			—		—			(284.0	)		—			(284.0	)
Share-based compensation expense		216			—		23.5			—			—			23.5
Adoption of ASC 606		—			—		—			1.6			—			1.6
Other		—			—		0.3			0.2			—			0.5
Comprehensive income		—			—		—			738.0			18.1			756.1
Balance at December 31, 2018		94,497			0.9		494.5			2,315.8			(138.8	)		2,672.4
Common stock withheld and retired to    cover taxes on vested stock awards		(87	)		—		(0.7	)		(7.5	)		—			(8.2	)
Common stock dividends declared		—			—		—			(299.7	)		—			(299.7	)
Share-based compensation expense		245			—		31.0			—			—			31.0
Other		—			—		—			(0.2	)		—			(0.2	)
Comprehensive income		—			—		—			696.4			(20.7	)		675.7
Balance at December 31, 2019		94,655			0.9		524.8			2,704.8			(159.5	)		3,071.0
Common stock withheld and retired to    cover taxes on vested stock awards		(108	)		—		(0.8	)		(9.7	)		—			(10.5	)
Common stock dividends declared		—			—		—			(320.9	)		—			(320.9	)
Share-based compensation expense		283			—		30.8			—			—			30.8
Other		—			—		(0.4	)		0.3			—			(0.1	)
Comprehensive income		—			—		—			461.0			15.0			476.0
Balance at December 31, 2020		94,830		$	0.9	$	554.4		$	2,835.5		$	(144.5	)	$	3,246.3

See notes to consolidated financial statements.

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Notes to Consolidated Financial Statements

1. 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 have approximately 15,200 employees.

We report our business in three reportable segments: Packaging, Paper, and Corporate and Other. Our Packaging segment produces a wide variety of containerboard and corrugated packaging products. The Paper segment manufactures and sells a range of communication-based papers.

During the fourth quarter of 2020, due to an increase in demand for our corrugated products and as part of our assessment of a potential conversion to produce containerboard, we began producing high-performance, virgin kraft linerboard on the No. 3 machine at our Jackson, Alabama mill on a trial basis. Before October 2020, operating results for the Jackson mill were included in the Paper segment. Beginning in October 2020, operating results for the Jackson mill are included in both the Packaging and Paper segments.

During the second quarter of 2018, the Company discontinued the production of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill and converted the No. 3 machine at the mill from production of white papers to production of virgin kraft linerboard. Before May 2018, operating results for the Wallula mill were included in the Paper segment. After May 2018, operating results for the Wallula mill are primarily included in the Packaging segment.

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 19, Segment Information.

In these consolidated financial statements, certain amounts in prior periods’ consolidated financial statements have been reclassified to conform with the current period presentation.

The consolidated financial statements include the accounts of PCA and its majority-owned subsidiaries after elimination of intercompany balances and transactions.

2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. We adjust such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates will be reflected in the consolidated financial statements in future periods.

Revenue Recognition

In accordance with ASU 2014-09 (Topic 606): Revenue from Contracts with Customers, we recognize revenue when control of the promised goods or services is transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. The timing of revenue recognition for most goods and services occurs when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. For most packaging and paper products, revenue is recognized when the product is shipped from the mill or from our manufacturing facility to our customer. Shipping and handling fees billed to a customer are recorded on a gross basis in “Net sales”, with the corresponding shipping and handling costs included in “Cost of sales” in the concurrent period as the revenue is recorded. We present taxes collected from customers and remitted to governmental authorities on a net basis in our Consolidated Statements of Income. See Note 4, Revenue, for more information.

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Planned Major Maintenance Costs

The Company accounts for its planned major maintenance activities in accordance with ASC 360, Property, Plant, and Equipment, using the deferral method. All maintenance costs incurred during the year are expensed in the year in which the maintenance activity occurs.

Share-Based Compensation

We recognize compensation expense for awards granted under the PCA long-term equity incentive plans based on the fair value on the grant date. We recognize the cost of the equity awards expected to vest over the period the awards vest. See Note 14, Share-Based Compensation, for more information.

Research and Development

Research and development costs are expensed as incurred. The amount charged to expense was $15.5 million, $16.0 million, and $14.4 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Cash and Cash Equivalents

Cash and cash equivalents include all cash balances and highly liquid investments with original maturities of three months or less at the date of purchase. Cash equivalents are stated at cost, which approximates market. Cash and cash equivalents totaled $974.6 million and $679.5 million at December 31, 2020 and 2019, respectively, which included cash equivalents of $662.2 million and $410.7 million, respectively. At December 31, 2020 and 2019, we had $2.2 million and $2.4 million, respectively, of cash at our operations outside the United States.

Marketable Debt Securities

The Company’s marketable debt securities have been classified and accounted for as available-for-sale (AFS) marketable debt securities in accordance with ASU 2016-13, Financial Instruments – Credit Losses (Topic 326). The Company reports its marketable debt securities at fair value, and they are classified as short-term or long-term based on each security’s underlying contractual maturity date.

The Company’s marketable debt securities are analyzed at the individual debt security level. Changes in the fair value of the debt security have the potential to impact accumulated other comprehensive income (loss) (AOCI), the Company’s earnings, or both.

The Company regularly reviews its investment portfolio to determine if any debt security is impaired. A decline in the fair value of the debt security below its amortized cost results in an impairment of the debt security. If there is an intent to sell the debt security, or if it is more likely than not that the debt security will be sold prior to recovering the amortized cost basis, the Company recognizes the impairment as a realized loss in earnings by writing down the debt security’s amortized cost basis.

Additional analysis is required if there is not an intent to sell the debt security, or if a recovery of the amortized cost basis is expected to be made prior to the sale of the security. If any portion of the impairment is the result of a credit loss, the Company recognizes this portion in earnings through an allowance for credit losses, with the remainder recognized as unrealized loss in AOCI. Subsequent improvements in credit losses are recognized as a reduction in the allowance. Any impairment not attributed to credit loss is recognized as an unrealized loss in AOCI in its entirety.

The Company considers several factors when determining if a portion of an impairment is the result of a credit loss including, but not limited to, adverse conditions related to the financial health and future outlook of the issuer; the credit quality of the issuer, as reported by credit rating agencies; trends present in the issuer’s industry in which it operates; and general market conditions.

For the year ended December 31, 2020, we do not consider any of the impairments related to our marketable debt securities to be the result of credit losses. We recorded no other-than-temporary impairment charges on our AFS securities for the year ended December 31, 2019 under prior year guidance ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 11, Cash, Cash Equivalents, and Marketable Debt Securities, for more information.

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Trade Accounts Receivable, Allowances, and Customer Deductions

Trade accounts receivable are recorded at amortized cost and represent a contractual right to receive payment from a customer. The Company’s trade accounts receivable are short-term receivables, with most requiring payment within 30 to 60 days, and represent the only class of financing receivables utilized by the Company. As of December 31, 2020, we do not expect the effect of the COVID-19 pandemic to have a material impact on our ability to collect on our outstanding trade accounts receivable.

In accordance with ASU 2016-13, Financial Instruments – Credit Losses (Topic 326), the Company established an allowance for credit losses, which is a valuation account that estimates the expected credit loss over the lifetime of the asset and is deducted from, or added to, the amortized cost basis of the trade accounts receivable. The allowance for credit losses is based upon a combination of factors such as historical collection experience, aged receivables, current economic conditions, and reasonable and supportable forecasts on future economic conditions. Expected recoveries of amounts previously written off, not to exceed the aggregate of the amount previously written off, are also considered when determining the necessary allowance at the balance sheet date. When determining the allowance for credit losses, management also considers specific customer accounts that may be considered higher risk or uncollectible due to customer industry trends, bankruptcy filings, or substantial downgrades of credit scores.

Current period estimates for the allowance for credit losses are compared against the allowance previously recorded, and all required adjustments are reported as credit loss expense (for expected losses or write offs) or a reversal of credit loss expense (for expected recoveries) in net income. Outstanding trade accounts receivable balances are written off when deemed uncollectible after undergoing reasonable collection efforts. At December 31, 2020, the allowance for credit losses was $3.0 million, and at December 31, 2019, the allowance for doubtful accounts was $4.2 million.

The customer deductions reserve represents the estimated amount required for customer returns, allowances, and earned discounts. Based on the Company’s experience, customer returns, allowances, and earned discounts have averaged approximately 1% of gross selling price. Accordingly, PCA reserves 1% of its open customer accounts receivable balance for these items. The reserves for customer deductions of $7.6 million and $8.4 million at December 31, 2020 and 2019, respectively, are also included as a reduction of the accounts receivable balance.

Derivative Instruments and Hedging Activities

The Company records its derivatives, if any, in accordance with ASC 815, Derivatives and Hedging. The guidance requires the Company to recognize derivative instruments as either assets or liabilities on the balance sheet at fair value. The accounting for changes in the fair value of a derivative depends on the intended use and designation of the derivative instrument. For a derivative designated as a fair value hedge, the gain or loss on the derivative is recognized in earnings in the period of change at fair value together with the offsetting gain or loss on the hedged item. For a derivative instrument designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially reported as a component of AOCI and is subsequently recognized in earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is recognized in earnings. We were not party to any derivative-based arrangements at December 31, 2020 and 2019.

Fair Value Measurements

PCA measures the fair value of its financial instruments and marketable debt securities in accordance with ASC 820, Fair Value Measurements and Disclosures. The guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. It is determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes the following hierarchy that prioritizes the inputs to valuation methodologies used to measure fair value:

Level 1 — Valuations based on quoted prices for identical assets and liabilities in active markets.

Level 2 — Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

Level 3 — Valuations based on unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets that are measured at fair value using the net asset value (NAV) per share as a practical expedient are not categorized within the fair value hierarchy.

45

Financial instruments and marketable debt securities measured at fair value on a recurring basis include the fair values of our marketable debt securities and our pension and postretirement benefit assets and liabilities. The valuation techniques used to measure the fair value of the Company’s marketable debt securities and pension and postretirement benefit assets and liabilities, which generally have counterparties with high credit ratings, are based on quoted market prices or model-driven valuations using significant inputs derived from or corroborated by observable market data. See Note 11, Cash, Cash Equivalents, and Marketable Debt Securities, and Note 12, Employee Benefit Plans and Other Postretirement Benefits, for more information.

Other assets and liabilities measured and recognized at fair value on a nonrecurring basis include assets acquired and liabilities assumed in acquisitions and our asset retirement obligations. Given the nature of these assets and liabilities, evaluating their fair value from the perspective of a market participant is inherently complex. Assumptions and estimates about future values can be affected by a variety of internal and external factors. Changes in these factors may require us to revise our estimates and could require us to retroactively adjust provisional amounts that we recorded for the fair values of assets acquired and liabilities assumed in connection with business combinations. These adjustments could have a material effect on our financial condition and results of operations. See Note 13, Asset Retirement Obligations, for more information.

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.

The components of inventories were as follows (dollars in millions):

	December 31,
	2020		2019
Raw materials	$	263.5	$	271.5
Work in process		11.6		11.0
Finished goods		183.6		207.7
Supplies and materials		329.2		303.9
Inventories	$	787.9	$	794.1

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost. Cost includes expenditures for major improvements and replacements and the amount of interest cost associated with significant capital additions. Repairs and maintenance costs are expensed as incurred. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in “Net income” in our Consolidated Statements of Income.

Property, plant, and equipment consisted of the following (dollars in millions):

	December 31,
	2020			2019
Land and land improvements	$	179.6		$	177.5
Buildings		858.5			837.4
Machinery and equipment		5,826.6			5,727.4
Construction in progress		360.0			174.0
Other		88.8			81.5
Property, plant and equipment, at cost		7,313.5			6,997.8
Less accumulated depreciation		(4,120.1	)		(3,846.1	)
Property, plant and equipment, net	$	3,193.4		$	3,151.7

The amount of interest capitalized from construction in progress was $3.7 million, $3.4 million, and $4.5 million for the years ended December 31, 2020, 2019, and 2018, respectively.

46

Depreciation is computed on the straight-line basis over the estimated useful lives of the related assets. Assets under finance leases are depreciated on the straight-line method over the term of the lease or the useful life, if shorter. The following lives are used for the various categories of assets:

Buildings and land improvements	5 to 40 years
Machinery and equipment	3 to 25 years
Trucks and automobiles	3 to 10 years
Furniture and fixtures	3 to 20 years
Computers and hardware	3 to 10 years
Leasehold improvements	Period of the lease or useful life, if shorter

The amount of depreciation expense was $362.5 million, $346.8 million, and $361.7 million for the years ended December 31, 2020, 2019, and 2018, respectively. In 2020, 2019, and 2018, we recognized incremental depreciation expense of $4.5 million, $0.3 million, and $14.5 million, respectively. The incremental depreciation expense for 2020 related to closures of corrugated products facilities, while the incremental depreciation expense for 2019 and 2018 primarily related to the second quarter 2018 discontinuation of paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

Pursuant to the terms of an industrial revenue bond, title to certain property, plant, and equipment was transferred to a municipal development authority in 2009 in order to receive a property tax abatement. The title of these assets will revert back to PCA upon retirement or cancellation of the bond. The assets are included in the consolidated balance sheets under the caption “Property, plant, and equipment, net”, as all risks and rewards remain with the Company.

Leases

We determine if an arrangement is, or contains, a lease at the inception date based on the presence of identified assets and our right to obtain substantially all of the economic benefit from or to direct the use of such assets. When we determine a lease exists, we record a right-of-use asset and corresponding lease liability on our consolidated balance sheets. Right-of-use assets represent our right to use an underlying asset for the lease term. Lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets are recognized at commencement date at the value of the lease liability and are adjusted for any prepayments, lease incentives received, and initial direct costs incurred. Lease liabilities are recognized at lease commencement date based on the present value of remaining lease payments over the lease term. As the discount rate implicit in the lease is not readily determinable in most of our leases, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

Operating lease balances are included in Operating lease right-of-use assets with the related liabilities included in Current Operating lease obligations and Long-term Operating lease obligations. Assets under finance leases are included in Property, plant and equipment, net, with the related liabilities included in Current Finance lease obligations and Long-term Finance lease obligations.

We do not record lease contracts with a term of 12 months or less on our consolidated balance sheets.

We recognize fixed lease expense for operating leases on a straight-line basis over the lease term. For finance leases, we recognize amortization expense on the right-of-use asset and interest expense on the lease liability over the lease term.

We have lease agreements with non-lease components that relate to lease components (e.g., common area maintenance such as cleaning or landscaping, insurance, etc.). We account for each lease and any non-lease components associated with that lease as a single lease component for all underlying asset classes. Accordingly, all costs associated with a lease contract are accounted for as lease costs.

Long-Lived Asset Impairment

Long-lived assets other than goodwill and other intangibles are reviewed for impairment in accordance with provisions of ASC 360, Property, Plant and Equipment. In the event that facts and circumstances indicate that the carrying amount of any long-lived assets may be impaired, an evaluation of recoverability is performed. If an evaluation is required, the estimated

47

future undiscounted cash flows associated with the asset (or group of assets) is compared to the assets (or group of assets) carrying amount to determine if a write-down to fair value is required.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of our long-lived assets within our Paper reporting unit, including property, plant, and equipment, and performed a recoverability test on the Paper reporting unit long-lived assets as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long-lived assets within our Paper segment, inclusive of property, plant, and equipment, were 100% recoverable.

Goodwill and Intangible Assets

The Company has capitalized certain intangible assets, primarily goodwill, customer relationships, and trademarks and trade names, based on their estimated fair value at the date of acquisition. Amortization is provided for customer relationships on a straight-line basis over periods ranging from ten to 40 years, and trademarks and trade names over periods ranging from five to 20 years.

Goodwill, which amounted to $863.5 million and $918.7 million for the years ended December 31, 2020 and 2019, respectively, is not amortized but is subject to an annual impairment test in accordance with ASC 350, Intangibles – Goodwill and Other. We test goodwill for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. Additionally, we evaluate the remaining useful lives of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives are necessary.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit and performed an interim quantitative impairment analysis as of May 31, 2020. Based on the evaluation performed, we determined that the carrying value of the Paper reporting unit exceeded its fair value, which resulted in a goodwill impairment charge totaling $55.2 million.

The Company concluded that none of the goodwill or intangible assets were impaired in the 2020, 2019, and 2018 annual impairment tests. See Note 8, Goodwill and Intangible Assets, for additional information.

Pension and Postretirement Benefits

Several estimates and assumptions are required to record pension costs and liabilities, including discount rate, return on assets, and longevity and service lives of employees. We review and update these assumptions annually unless a plan curtailment or other event occurs, requiring that we update the estimates on an interim basis. While we believe the assumptions used to measure our pension and postretirement benefit obligations are reasonable, differences in actual experience or changes in assumptions may materially affect our pension and postretirement benefit obligations and future expense. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

For postretirement health care plan accounting, the Company reviews external data and its own historical trends for health care costs to determine the health care cost trend rate assumption.  

Environmental Matters

Environmental expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities are recorded for environmental contingencies when such costs are probable and reasonably estimable. These liabilities are adjusted as further information develops or circumstances change. Environmental expenditures related to existing conditions resulting from past or current operations from which no current or future benefit is discernible are expensed as incurred.

Asset Retirement Obligations

The Company accounts for its retirement obligations related predominantly to landfill closure, wastewater treatment pond dredging, closed-site monitoring costs, and certain leasehold improvements under ASC 410, Asset Retirement and Environmental Obligations, which requires recognition of legal obligations associated with the retirement of long-lived assets whether these assets are owned or leased. These legal obligations are recognized at fair value at the time that the obligations are

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incurred. When we record the liability, we capitalize the cost by increasing the carrying amount of the related long-lived asset, which is amortized to expense over the useful life of the asset. See Note 13, Asset Retirement Obligations, for additional information.

Deferred Debt Issuance Costs

PCA has capitalized certain costs related to obtaining its financing. These costs are amortized to interest expense using the effective interest rate method over the terms of the related financing, which range from 10 to 30 years. At December 31, 2020 and 2019, deferred debt issuance costs were $14.3 million and $16.3 million, respectively, and were recorded in “Long-Term Debt” on our Consolidated Balance Sheets.

Cutting Rights and Fiber Farms

We lease the cutting rights to approximately 71,000 acres of timberland. For our cutting rights, we capitalize the annual lease payments and reforestation costs associated with these leases. Costs are recorded as depletion when the timber or fiber is harvested and used in operations or sold to customers. Capitalized long-term lease costs for our cutting rights, primarily recorded in “Other long-term assets” on our Consolidated Balance Sheets, were $20.3 million and $21.6 million as of December 31, 2020 and 2019, respectively. The amount of depletion expense was $3.1 million, $2.7 million, and $7.6 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Deferred Software Costs

PCA capitalizes costs related to the purchase and development of software, which is used in its business operations. The costs attributable to these software systems are amortized over their estimated useful lives based on various factors such as the effects of obsolescence, technology, and other economic factors. Net capitalized software costs recorded in “Other long-term assets” on our Consolidated Balance Sheets were $4.8 million and $1.4 million for the years ended December 31, 2020 and 2019, respectively. Software amortization expense was $1.1 million, $0.9 million, and $2.1 million for the years ended December 31, 2020, 2019, and 2018, respectively.

During 2019, the Company early adopted ASU 2018-15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which includes amendments to align the accounting for costs incurred to implement a cloud computing arrangement that is a service contract with the guidance on capitalizing costs associated with developing or obtaining internal-use software. As of December 31, 2020, capitalized costs associated with cloud computing arrangements were $4.0 million. These costs were immaterial as of December 31, 2019.

Income Taxes

PCA utilizes the liability method of accounting for income taxes whereby it recognizes deferred tax assets and liabilities for the future tax consequences of temporary differences between the tax basis of assets and liabilities and the reported amounts in the financial statements. Deferred tax assets will be reduced by a valuation allowance if, based upon management’s estimates, it is more likely than not that a portion of the deferred tax assets will not be realized in a future period. The estimates utilized in the recognition of deferred tax assets are subject to revision in future periods based on new facts or circumstances. PCA’s practice is to recognize interest and penalties related to unrecognized tax benefits in income tax expense.

Trade Agreements

PCA regularly trades containerboard with other manufacturers primarily to reduce shipping costs. These agreements are entered into with other producers on an annual basis, pursuant to which both parties agree to ship an identical number of tons of containerboard to each other within the agreement period. These agreements lower transportation costs by allowing each party’s containerboard mills to ship containerboard to the other party’s closer corrugated products plant. PCA tracks each shipment to ensure that the other party’s shipments to PCA match PCA’s shipments to the other party during the agreement period. Such transfers are possible because certain grades of containerboard are commodity products with no distinguishing product characteristics. These transactions are accounted for at carrying value, and revenue is not recorded as the transactions do not represent the culmination of an earnings process. The transactions are recorded into inventory accounts, and no sale or income is recorded until such inventory is converted to a finished product and sold to an end-use customer.

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Business Combinations

The Company accounts for acquisitions under ASC 805, Business Combinations and ASU 2017-01 (Topic 805): Clarifying the Definition of a Business. ASC 805 requires separate recognition of assets acquired and liabilities assumed from goodwill at the acquisition date fair values. ASU 2017-01 (Topic 805) provides additional guidance to assist entities with evaluating whether transfers of assets and activities should be accounted for as acquisitions of assets or businesses. Goodwill as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date fair values of the assets acquired and liabilities assumed. During the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated financial statements.

Recently Adopted Accounting Standards

Effective January 1, 2020, we adopted Accounting Standards Update (“ASU”) 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 introduces the Current Expected Credit Losses (“CECL”) framework for evaluating credit losses on financial instruments measured at amortized cost. ASU 2016-13 was applied using the modified retrospective method, and as a result, amounts recorded prior to January 1, 2020 have not been retrospectively restated. This new framework requires entities to incorporate forward-looking information into their estimate of current expected credit loss as of each reporting date. Although available-for-sale (“AFS”) debt securities are not within the scope of the new CECL framework, the ASU includes an amended impairment model for evaluating losses related to AFS debt securities. The guidance in this update also includes enhanced requirements for disclosures related to credit loss estimates.

Prior to adoption of the new standard, the Company already incorporated forward-looking information into its estimate of credit losses for trade receivables. Due to the short duration of the Company’s trade receivables, the adoption of ASU 2016-13 did not have a material impact on trade receivables. The adoption of ASU 2016-13 also did not have a material impact on the Company’s AFS marketable debt securities, as the Company only invests in highly-rated AFS marketable debt securities. Overall, the adoption of ASU 2016-13 did not have a material impact on the Company’s financial condition, results of operations or cash flow.

Effective January 1, 2020, the Company adopted ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 removes or modifies certain disclosure requirements and adds additional requirements to improve the usefulness of the fair value measurement disclosure for financial statement users. Certain new requirements of ASU 2018-13 are required to be applied prospectively for the first interim period of the initial year of adoption. However, the modifications and removal of certain information needs to be applied retrospectively. The adoption of this Update did not have a significant impact on the Company’s related disclosures as reflected in this Annual Report on Form 10-K.

Effective for the annual period ended December 31, 2020, the Company adopted ASU 2018-14, Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans. ASU 2018-14 removes certain disclosures that are not considered cost beneficial, clarifies certain required disclosures, and adds additional disclosures. The amendments in this ASU were applied retrospectively in this Annual Report on Form 10-K and did not have a significant impact on the disclosures for our defined pension benefit plans and other postretirement benefits.

Effective January 1, 2019, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02 (Topic 842): Leases, which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The original guidance required application on a modified retrospective basis with the earliest period presented. In July 2018, the FASB issued ASU 2018-11, Targeted Improvements to ASC 842, which included an option to not restate comparative periods in transition and elect to use the effective date of ASC 842, Leases, as the date of initial application of transition, which we elected. As a result of the adoption of ASC 842 on January 1, 2019, we recorded operating lease liabilities of $228 million, with corresponding right-of-use assets of the same amount. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed us to carry forward the historical lease classification and not to reassess whether existing or expired contracts contain a lease. We also elected the short-term lease recognition exemption, which permits us to exclude short-term leases (i.e. leases with terms of 12 months or less) from the recognition requirements of this standard, and we elected to account for lease and non-lease components as a single lease component for all classes of underlying assets except for embedded leases. The adoption of ASC 842 had an immaterial impact on our consolidated net earnings, liquidity and debt covenants under our current agreements for the year ended December 31, 2019. See Note 3, Leases, for more information.

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New Accounting Standards Not Yet Adopted

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting. The amendments in this Update are elective and apply to all entities, subject to meeting certain criteria, that have contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Companies can apply the ASU immediately, but the guidance will only be available until December 31, 2022. The Company is currently evaluating the impact of this guidance, but does not expect the guidance to have a significant impact on its related disclosures.

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.

3.Leases

We group our leases into two primary lease types, real estate and equipment, and into various asset classes within each type. Real estate leases primarily include manufacturing locations, office space, warehouses, and design centers, while equipment leases primarily include manufacturing equipment.

Leases with an initial term of 12 months or less and certain month-to-month leases are not recorded on the balance sheet. The lease expense for these types of leases is recognized on a straight-line basis over the lease term.

To determine the lease term, we include the non-cancellable period of the lease together with the following: all periods covered by an option to extend the lease if we are reasonably certain to exercise that option; any periods covered by an option to terminate the lease if we are reasonably certain not to exercise that option; and any periods covered by an option to extend or not to terminate the lease that are controlled by the lessor. The exercising of lease renewal options is based on whether future economic benefit is expected to be derived from the renewal. Most of our real estate leases contain at least one renewal option. Renewal options generally range from 1 to 5 years. Although equipment leases may also contain renewal options, we typically do not expect to extend and/or exercise these renewal options unless a compelling business reason is provided to management.

Our leases may contain fixed and variable costs. Fixed costs determine the right-of-use asset. Variable costs are those costs which will vary month to month and are excluded from the calculation of the right-of-use asset. Variable lease costs are recorded to lease expense in the period in which they are incurred.

Our leases do not provide an implicit borrowing rate of return. Therefore, we use our incremental borrowing rate to calculate the present value of lease payments at inception of the lease or when a lease is modified.

Supplemental balance sheet information related to our operating leases was as follows (dollars in millions):

	Year Ended December 31,
	2020		2019
Operating lease right-of-use assets	$	234.2	$	234.3
Current portion of operating lease obligations	$	68.9	$	62.6
Long-term portion of operating lease obligations		173.6		177.6
Total operating lease obligations	$	242.5	$	240.2

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Supplemental balance sheet information related to our finance leases was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019
Buildings	$	0.3		$	0.3
Machinery and equipment		28.5			28.5
Total		28.8			28.8
Less accumulated amortization		(19.6	)		(18.1	)
Total	$	9.2		$	10.7
Current portion of finance lease obligations	$	1.6		$	1.5
Long-term portion of finance lease obligations		14.4			16.0
Total finance lease obligations	$	16.0		$	17.5

The Company was obligated under finance leases covering buildings and machinery and equipment in the amount of $16.0 million and $17.5 million at December 31, 2020 and 2019, respectively. Amortization of assets under finance lease obligations is included in depreciation expense.

For both operating and finance leases, the weighted average remaining lease term in years and weighted average discount rates were as follows:

	Year Ended December 31,
	2020		2019
Weighted-average remaining lease term (years):
Operating leases		5.3		5.6
Finance leases		7.8		8.8
Weighted-average discount rate:
Operating leases	3.79%		4.23%
Finance leases	6.66%		6.66%

The components of lease expense were as follows (dollars in millions):

	Year Ended December 31,
	2020		2019
Finance lease cost:
Amortization of finance lease assets	$	1.5	$	1.5
Interest on lease liabilities		1.1		1.2
Total finance lease cost		2.6		2.7
Operating lease cost		74.4		70.2
Short-term lease cost		18.0		19.2
Variable lease cost		12.9		13.7
Total lease cost	$	107.9	$	105.8

Total lease expense, including base rent on all leases and executory costs, such as insurance, taxes, and maintenance, for the year ended December 31, 2018 was $115.1 million. These costs are included in “Cost of sales” and “Selling, general, and administrative expenses” in our Consolidated Statements of Income. We had an insignificant amount of sublease rental income for the years ended December 31, 2020 and 2019 and no sublease rental income for the year ended December 31, 2018.

Interest expense related to finance lease obligations for the year ended December 31, 2018 was $1.3 million.

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Supplemental cash flow information related to leases was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	(68.2	)	$	(60.0	)
Operating cash flows for finance leases		(1.5	)		(1.5	)
Financing cash flows for finance leases		(1.1	)		(1.2	)
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	$	(35.7	)	$	(27.7	)
Finance leases		—			—
Supplemental non-cash information on changes in lease liabilities	$	34.8		$	44.5
Supplemental non-cash information on changes in right-of-use assets	$	35.8		$	21.4

The future minimum payments under operating and finance lease liabilities at December 31, 2020 were as follows (dollars in millions):

	Operating Leases			Finance Leases
2021	$	76.7		$	2.7
2022		58.9			2.7
2023		42.3			2.7
2024		30.3			2.7
2025		21.1			2.7
Thereafter		40.4			7.0
Total lease payments		269.7			20.5
Less imputed interest (a)		(27.2	)		(4.5	)
Present value of lease liabilities	$	242.5		$	16.0

(a) Calculated using the incremental borrowing rate for each lease applied to the future payments.

4. Revenue

Revenue Recognition

Revenue is recognized when control of the promised goods or services is transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. Sales, value added, and other taxes collected concurrently with revenue-producing activities are excluded from revenue.

The following table presents our revenues disaggregated by product line (dollars in millions):

	Year Ended December 31,
	2020		2019		2018
Packaging	$	5,919.5	$	5,932.2	$	5,938.5
Paper		674.8		964.3		1,002.0
Corporate and Other		63.9		67.8		74.1
Total revenue	$	6,658.2	$	6,964.3	$	7,014.6

Packaging Revenue

Our containerboard mills produce linerboard and corrugating medium which are papers primarily used in the production of corrugated products. The majority of our containerboard production is used internally by our corrugated products manufacturing facilities. The remaining containerboard is sold to outside domestic and export customers. Our corrugated products manufacturing plants produce a wide variety of corrugated packaging products and retail merchandise displays. We sell corrugated products to national, regional and local accounts, which are broadly diversified across industries and geographic locations.

The Company recognizes revenue for its packaging products when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. Based on our

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express terms and conditions of the sale of products to our customers, as well as terms included in contractual arrangements with our customers, we do not have an enforceable right of payment that includes a reasonable profit throughout the duration of the contract for products that do not have an alternative use. Revenue is recognized when the product is shipped from the mill or from our manufacturing facility to our customer. Certain customers may receive volume-based incentives, which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized.

Certain customers receive a portion of their packaging products as consigned inventory with billing triggered once the customer uses or consumes the designated product. Prior to invoicing, these amounts are handled as unbilled receivables. Total unbilled receivables, which are immaterial in amount, are included in the accounts receivable financial statement caption.

Paper Revenue

We manufacture and sell a range of communication-based papers. Communication papers consist of cut-size office papers, and printing and converting papers.

The Company recognizes revenue for its paper products when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. Revenue is recognized when the product is shipped from the mill or from our manufacturing facility or distribution center to our customer. Certain customers may receive volume-based incentives, which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized.

Corporate and Other Revenue

Revenue in this segment primarily relates to Louisiana Timber Procurement Company, L.L.C. (LTP), a variable-interest entity that is 50% owned by PCA and 50% owned by Boise Cascade Company (Boise Cascade). 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. See Note 18, Transactions With Related Parties, for more information related to LTP.

The Company recognizes revenue within this segment when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time.

Practical Expedients and Exemption

Shipping and handling fees billed to a customer are recorded on a gross basis in "Net sales" with the corresponding shipping and handling costs included in "Cost of sales" in the concurrent period as the revenue is recorded. We expense sales commissions when incurred because the amortization period is one year or less. Sales commissions are recorded in "Selling, general, and administrative expenses".

We do not disclose the value of unsatisfied performance obligations for contracts with an original expected duration of one year or less.

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5. 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).

	Year Ended December 31,
		2020			2019			2018
Numerator:
Net income	$	461.0		$	696.4		$	738.0
Less: distributed and undistributed earnings allocated    to participating securities		(3.6	)		(5.2	)		(5.7	)
Net income attributable to common stockholders	$	457.4		$	691.2		$	732.3
Denominator:
Weighted average common shares outstanding		94.1			93.8			93.7
Effect of dilutive securities		0.3			0.3			0.2
Diluted common shares outstanding		94.4			94.1			93.9
Basic income per common share	$	4.86		$	7.36		$	7.82
Diluted income per common share	$	4.84		$	7.34		$	7.80

6. Other Expense, Net

The components of other expense, net, were as follows (dollars in millions):

	Year Ended December 31,
	2020			2019			2018
Asset disposals and write-offs (a)	$	(26.5	)	$	(25.0	)	$	(17.3	)
Facilities closure and other costs (b)		(19.1	)		(0.3	)		(1.6	)
Wallula mill restructuring (c)		—			(0.7	)		(14.9	)
Insurance deductible for property damage (d)		—			—			(0.5	)
Acquisition and integration related costs (e)		—			—			(0.2	)
Other		(5.1	)		(6.7	)		(6.7	)
Total	$	(50.7	)	$	(32.7	)	$	(41.2	)

(a) For 2019, includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

(b) For 2020, includes charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a closed corrugated products facility during the second quarter of 2020. For 2019, includes charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility. For 2018, includes charges consisting of closure costs related to corrugated products facilities.

(c) Includes charges related to the discontinuation of production of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill in the second quarter of 2018 and the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(d) Includes charges for the property damage insurance deductible for a weather-related incident at one of our corrugated products facilities.

(e) Includes charges for acquisition and integration costs related to recent acquisitions.

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7. Income Taxes

The following is an analysis of the components of the consolidated income tax provision (dollars in millions):

	Year Ended December 31,
	2020			2019		2018
Current income tax provision -
U.S. federal	$	109.4		$	123.2	$	150.7
State and local		27.5			37.0		42.9
Foreign		0.1			0.1		0.2
Total current provision for taxes		137.0			160.3		193.8
Deferred income tax provision (benefit) -
U.S. federal		26.8			55.3		34.7
State and local		8.0			5.0		4.0
Foreign		(0.1	)		—		—
Total deferred provision (benefit) for taxes		34.7			60.3		38.7
Total provision for taxes	$	171.7		$	220.6	$	232.5

The effective tax rate varies from the U.S. federal statutory tax rate principally due to the following (dollars in millions):

	2020			2019			2018
Provision computed at U.S. federal statutory rate of 21%	$	132.9		$	192.6		$	203.8
Federal tax reform		—			—			(2.0	)
State and local taxes, net of federal benefit		28.4			35.7			36.9
Goodwill impairment (a)		11.6			—			—
Other		(1.2	)		(7.7	)		(6.2	)
Total	$	171.7		$	220.6		$	232.5

(a) For additional information regarding the impairment of goodwill within our Paper reporting unit, see Note 8, Goodwill and Intangible Assets.

The following details the scheduled expiration dates of our tax effected net operating loss (NOL) and other tax carryforwards at December 31, 2020 (dollars in millions):

	2021 Through 2030		2031 Through 2040		Indefinite		Total
U.S. federal NOLs	$	25.6	$	—	$	—	$	25.6
State taxing jurisdiction NOLs		1.3		0.2		—		1.5
Non-U.S. taxing jurisdiction NOLs		—		0.1		—		0.1
U.S. federal tax credit carryforwards		0.1		—		—		0.1
U.S. federal and non-U.S. capital loss carryforwards		0.4		—		0.1		0.5
Total	$	27.4	$	0.3	$	0.1	$	27.8

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Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts for income tax purposes. Deferred income tax assets and liabilities at December 31 are summarized as follows (dollars in millions): 

	December 31,
	2020			2019
Deferred tax assets:
Pension and postretirement benefits	$	70.1		$	90.7
Lease obligations		60.6			59.2
Employee benefits and compensation		39.3			35.5
Net operating loss carryforwards		27.2			30.8
Restricted stock and performance units		9.6			11.2
Inventories		5.9			14.1
Accrued liabilities		5.3			6.1
Capital loss and general business credit carryforwards		0.6			3.2
Derivatives		0.1			0.1
Gross deferred tax assets		218.7			250.9
Valuation allowance (b)		(0.5	)		(3.0	)
Net deferred tax assets	$	218.2		$	247.9
Deferred tax liabilities:
Property, plant and equipment	$	(465.6	)	$	(459.1	)
Goodwill and intangible assets		(72.7	)		(70.8	)
Right-of-use assets		(59.3	)		(58.1	)
Total deferred tax liabilities	$	(597.6	)	$	(588.0	)
Net deferred tax liabilities (c)	$	(379.4	)	$	(340.1	)

(b) Deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. Both the 2020 and 2019 valuation allowance relates to capital losses. We do not expect to generate capital gains before the capital losses expire. If or when recognized, the tax benefits relating to the reversal of any or all of the valuation allowance would be recognized as a benefit to income tax expense.

(c) As of December 31, 2020, we did not recognize U.S. deferred income taxes on our cumulative total of undistributed foreign earnings for our foreign subsidiaries. We indefinitely reinvest our earnings in operations outside the United States. It is not practicable to determine the amount of unrecognized deferred tax liability on these undistributed earnings because the actual tax liability, if any, is dependent on circumstances existing when the repatriation occurs.

Cash payments for federal, state, and foreign income taxes were $115.6 million, $172.7 million, and $140.8 million for the years ended December 31, 2020, 2019, and 2018, respectively.

The following table summarizes the changes related to PCA’s gross unrecognized tax benefits excluding interest and penalties (dollars in millions):

	2020			2019				2018
Balance as of January 1	$	(4.8	)	$	(4.6	)	$	(4.8	)
Increases related to prior years’ tax positions		—			(0.1	)		(0.1	)
Increases related to current year tax positions		(0.4	)		(0.4	)		(0.3	)
Expiration of the statute of limitations		—			0.3			0.6
Balance at December 31	$	(5.2	)	$	(4.8	)	$	(4.6	)

At December 31, 2020, PCA had recorded a $5.2 million gross reserve for unrecognized tax benefits, excluding interest and penalties. Of the total, $4.6 million (net of the federal benefit for state taxes) would impact the effective tax rate if recognized.

PCA recognizes interest accrued related to unrecognized tax benefits and penalties as income tax expense. For both years ended December 31, 2020 and 2019, we had $1.2 million of interest and penalties recorded for unrecognized tax benefits.

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During the next 12 months, it is possible that PCA's unrecognized tax benefits related to state apportionment issues could decrease by approximately $3.1 million due to settlements with state taxing authorities.

PCA is subject to income taxation in the United States, various state and local jurisdictions, Canada and Hong Kong.  A federal examination of the 2016 tax year commenced in April 2019. The tax years 2016 - 2020 remain open to federal examination. The tax years 2016 - 2020 remain open to state examinations. Some foreign tax jurisdictions are open to examination for the 2009 tax year forward. Through the Boise acquisition, PCA recorded net operating losses and credit carryforwards from 2008 through 2011 and 2013 that are subject to examinations and adjustments for at least three years following the year in which utilized.

8. Goodwill and Intangible Assets

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of goodwill and our long lived assets within our Paper reporting unit.

Goodwill

Due to the triggering event identified above an interim quantitative impairment analysis was performed as of May 31, 2020 for the Paper reporting unit, which is the same as our Paper reportable segment. We estimated the fair value of the Paper reporting unit using a combination of the income approach and the market approach, as further described below. Based on the evaluation performed, we determined that the carrying value of the Paper reporting unit exceeded its fair value, which resulted in a goodwill impairment charge totaling $55.2 million. The impairment charge is included in “Goodwill impairment” on our Consolidated Statements of Income and Comprehensive Income and is not tax deductible.

For purposes of our goodwill impairment analysis, we estimated the fair value of the Paper reporting unit using a combination of the income approach and the market approach applying an equal weighting. The income approach incorporated the estimated future cash flows and a terminal value discounted to their present value using an appropriate risk-adjusted discount rate. The estimated future cash flows and terminal value were based on internal forecasts and industry trends, including the long-term outlook for the paper industry. Our expected cash flows include assumptions about industry pricing, expected paper demand, and anticipated input and conversion costs. The discount rate utilized in the income approach was 9%, which was derived using a capital asset pricing model based on relevant industry data to estimate the cost of equity financing. The discount rate is commensurate with the risks and uncertainties inherent in the business and the cash flow forecasts, updated for recent events. The market approach estimated the fair value of the Paper reporting unit by using valuation metrics of publicly traded companies or historically completed transactions of comparable businesses.

The valuation of our Paper reporting unit requires significant judgment in evaluating recent indicators of market activity and estimated future cash flows, discount rates, and other factors. Our impairment analysis contains inherent uncertainties due to uncontrollable events that could positively or negatively impact anticipated future economic and operating conditions. In making these estimates, the weighted-average cost of capital is utilized to calculate the present value of future cash flows and terminal value. Many variables go into estimating future cash flows, including estimates of our future revenue growth and operating results. When estimating our projected revenue growth and future operating results, we considered industry trends, economic data, and our competitive situation.

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 both December 31, 2020 and 2019, we had $863.5 million of goodwill recorded in our Packaging segment on our Consolidated Balance Sheets. At December 31, 2020 and 2019, we had $0 million and $55.2 million of goodwill recorded in our Paper segment on our Consolidated Balance Sheets, respectively.

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Changes in the carrying amount of our goodwill were as follows (dollars in millions):

						Total
	Packaging		Paper			Goodwill
Balance at January 1, 2019	$	862.1	$	55.2		$	917.3
Acquisitions (a)		1.4		—			1.4
Balance at December 31, 2019		863.5		55.2			918.7
Impairment of Paper segment		—		(55.2	)		(55.2	)
Balance at December 31, 2020	$	863.5	$	—		$	863.5

(a) During 2019, the Company recorded a $1.4 million adjustment to increase the goodwill balance for the Company’s October 2018 acquisition of Englander.

Intangible Assets

Intangible assets are comprised of customer relationships and trademarks and trade names. As a result of the triggering event described above, we also performed a recoverability test on our long-lived assets within the Paper segment, including long lived intangible assets, as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long lived assets within our Paper segment, inclusive of the long lived intangible assets, were 100% recoverable.

The weighted average useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):

	As of December 31, 2020						As of December 31, 2019
	Weighted Average Remaining Useful Life (in Years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Remaining Useful Life (in Years)		Gross Carrying Amount		Accumulated Amortization
Customer relationships (b)(c)		9.1	$	503.8	$	220.2		10.0	$	503.8	$	180.2
Trademarks and trade names		9.3		34.8		23.0		9.5		34.8		20.6
Other		1.2		4.3		3.8		2.1		4.3		3.3
Total intangible assets (excluding goodwill)		9.1	$	542.9	$	247.0		9.9	$	542.9	$	204.1

(b) During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

(c) During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million.

Amortization expense was $42.9 million (including the $4.5 million adjustment to the customer relationships intangible asset related to the San Lorenzo, California facility closure, which was written off to amortization expense), $38.6 million, and $40.5 million for the years ended December 31, 2020, 2019, and 2018, respectively. Estimated amortization expense of intangible assets over the next five years is expected to approximate $37.3 million (2021), $34.9 million (2022), $33.9 million (2023), $33.4 million (2024), and $33.2 million (2025).

Impairment Testing

We test goodwill for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. Additionally, when we experience changes to our business or operating environment, we evaluate the remaining useful lives and recoverability of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives or impairment are necessary. As discussed above, as a result of the COVID-19 pandemic, we performed an interim quantitative impairment analysis of the goodwill and long-lived assets, including intangible assets, within our Paper reporting unit as of May 31, 2020 and recorded a goodwill impairment charge of $55.2 million. We also completed our annual test in the fourth quarter, and there was no further indication of goodwill or intangible asset impairment.

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9. Accrued Liabilities

The components of accrued liabilities were as follows (dollars in millions):

	December 31,
	2020		2019
Compensation and benefits	$	126.5	$	124.5
Customer volume discounts and rebates		27.1		27.9
Medical insurance and workers’ compensation		25.5		26.3
Franchise, property, sales and use taxes		16.5		15.3
Environmental liabilities and asset retirement obligations		4.6		5.6
Severance, retention, and relocation		4.1		3.5
Other		11.9		14.4
Total	$	216.2	$	217.5

10. Debt

At December 31, 2020 and 2019, our long-term debt and interest rates on that debt were as follows (dollars in millions):

	December 31, 2020					December 31, 2019
	Amount		Interest Rate			Amount		Interest rate
Revolving Credit Facility, due August 2021	$	—		—	%	$	—		—	%
4.50% Senior Notes, net of discount of $0.6 million    and $0.8 million as of December 31, 2020 and 2019,    respectively, due November 2023		699.4		4.50	%		699.2		4.50	%
3.65% Senior Notes, net of discount of $0.5 million    and $0.6 million as of December 31, 2020 and 2019,    respectively, due September 2024		399.5		3.65	%		399.4		3.65	%
3.40% Senior Notes, net of discount of $1.2 million    and $1.3 million as of December 31, 2020 and 2019,    respectively, due December 2027		498.8		3.40	%		498.7		3.40	%
3.00% Senior Notes, net of discount of $0.6 million    and $0.7 million as of December 31, 2020 and 2019,    respectively, due December 2029		499.4		3.00	%		499.3		3.00	%
4.05% Senior Notes, net of discount of $3.4 million    and $3.5 million as of December 31, 2020 and 2019,    respectively, due December 2049		396.6		4.05	%		396.5		4.05	%
Total		2,493.7		3.77	%		2,493.1		3.77	%
Less current portion		—		—	%		—		—	%
Less unamortized debt issuance costs		14.3					16.3
Total long-term debt	$	2,479.4		3.77	%	$	2,476.8		3.77	%

On November 21, 2019, the Company issued $500.0 million of 3.00% senior notes due 2029 and $400.0 million of 4.05% senior notes due 2049, through a registered public offering and notified the holders of its $500.0 million of 2.45% notes due December 15, 2020 and $400.0 million of 3.90% notes due June 15, 2022 that it would redeem those notes in December 2019. On December 6, 2019, PCA completed the redemption of the old 2.45% notes for $509.7 million, which included a redemption premium of $3.8 million and $5.8 million of accrued and unpaid interest. On December 23, 2019, PCA completed the redemption of the old 3.90% notes for $418.7 million, which included a redemption premium of $18.4 million and $0.3 million of accrued and unpaid interest. PCA used the proceeds of the offering of the new 3.00% and 4.05% notes and cash on hand to fund the redemptions and the $8.3 million of debt issuance costs. The debt issuance costs are amortized to interest expense using the effective interest method over the terms of the notes.

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As of December 31, 2020, the details of our borrowings were as follows:

• Senior Unsecured Credit Agreement. On August 29, 2016, we entered into an amended and restated credit facility, which included a term loan facility (that was subsequently repaid in full in 2017) to finance an acquisition and a five-year revolving credit facility to 2021. Currently, our credit facility only includes a $350.0 million unsecured revolving credit facility with variable interest (LIBOR plus a margin) due August 2021. During 2020, we did not borrow under the Revolving Credit Facility. At December 31, 2020, we had $23.7 million of outstanding letters of credit that were considered outstanding on the revolving credit facility, resulting in $326.3 million of unused borrowing capacity. The outstanding letters of credit were primarily for workers compensation. We are required to pay commitment fees on the unused portions of the credit facility.

• 4.50% Senior Notes. On October 22, 2013, we issued $700.0 million of 4.50% senior notes due November 1, 2023, through a registered public offering.

• 3.65% Senior Notes. On September 5, 2014, we issued $400.0 million of 3.65% senior notes due September 15, 2024, through a registered public offering.

• 3.40% Senior Notes. On December 13, 2017, we issued $500.0 million of 3.40% senior notes due December 15, 2027, through a registered public offering.

• 3.00% Senior Notes. On November 21, 2019, we issued $500.0 million of 3.00% senior notes due December 15, 2029, through a registered public offering.

• 4.05% Senior Notes. On November 21, 2019, we issued $400.0 million of 4.05% senior notes due December 15, 2049, through a registered public offering.

The instruments governing our indebtedness contain financial and other covenants that limit the ability of PCA and its subsidiaries to enter into sale and leaseback transactions, incur liens, incur indebtedness at the subsidiary level, enter into certain transactions with affiliates, merge or consolidate with any other person or sell or otherwise dispose of all or substantially all of our assets. Our credit facility also requires us to comply with certain financial covenants, including maintaining a minimum interest coverage ratio and a maximum leverage ratio. A failure to comply with these restrictions could lead to an event of default, which could result in an acceleration of any outstanding indebtedness and/or prohibit us from drawing on the revolving credit facility. An acceleration under the revolving credit facility may also constitute an event of default under the senior notes indenture. At December 31, 2020, we were in compliance with these covenants.

At December 31, 2020, we have $2,493.7 million of fixed-rate senior notes outstanding. At December 31, 2020, the fair value of our fixed-rate debt was estimated to be $2,827.1 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), discussed further in Note 2, Summary of Significant Accounting Policies.

Repayments, Interest, and Other

In 2020, we did not repay any outstanding debt, as we did not have any maturities of our Senior Notes during 2020.

In December 2019, we used the net proceeds from the November 2019 offering of the new 3.00% and 4.05% notes and cash on hand to redeem the 2.45% notes and 3.90% notes. We completed the redemption of the old 2.45% notes and 3.90% notes for $509.7 million and $418.7 million, respectively, which included redemption premiums and accrued and unpaid interest.

In 2018, we used cash on hand to repay debt outstanding of $150.0 million under the 6.50% Senior Notes due March 15, 2018 at maturity.

As of December 31, 2020, annual principal maturities for debt, excluding unamortized debt discount, are: none for 2021 through 2022, $700.0 million for 2023; $400.0 million for 2024; and $1.4 billion for 2025 and thereafter.

Interest payments paid in connection with the Company’s debt obligations for the years ended December 31, 2020, 2019, and 2018 were $97.0 million, $114.0 million (including redemption premiums of $22.2 million), and $97.0 million, respectively.

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Included in interest expense, net, are amortization of financing costs and, for 2019 and 2018, amortization of treasury lock settlements. Amortization of financing costs in 2020, 2019, and 2018 was $2.0 million, $4.5 million (including a $1.8 million write-off of deferred debt issuance costs related to the November 2019 debt refinancing), and $2.7 million, respectively. Amortization of treasury lock settlements was an $18.2 million net loss in 2019 (including a $13.1 million write-off of the remaining balance for treasury locks related to the November 2019 debt refinancing) and a $5.3 million net loss in 2018.

11.Cash, Cash Equivalents, and Marketable Debt Securities

The following table shows the Company’s cash and available-for-sale (AFS) debt securities by major asset category at December 31, 2020 and 2019 (in millions):

	December 31, 2020
	Adjusted Cost Basis		Unrealized Gain		Unrealized Loss		Fair Value		Cash and Cash Equivalents		Short-Term Marketable Debt Securities		Long-Term Marketable Debt Securities
Cash and cash equivalents	$	970.5	$	—	$	—	$	970.5	$	970.5	$	—	$	—
Level 1 (a):
Money market funds		0.6		—		—		0.6		0.6		—		—
U.S. Treasury securities		28.1		0.2		—		28.3		—		18.9		9.4
Subtotal		28.7		0.2		—		28.9		0.6		18.9		9.4
Level 2 (b):
Certificates of deposit		5.9		—		—		5.9		1.1		4.8		—
Commercial paper		3.2		—		—		3.2		1.0		2.2		—
U.S. government agency securities		6.6		—		—		6.6		—		2.6		4.0
Corporate debt securities		107.5		0.3		—		107.8		1.4		77.1		29.3
Subtotal		123.2		0.3		—		123.5		3.5		86.7		33.3
Total	$	1,122.4	$	0.5	$	—	$	1,122.9	$	974.6	$	105.6	$	42.7

	December 31, 2019
	Adjusted Cost Basis		Unrealized Gain		Unrealized Loss		Fair Value (c)		Cash and Cash Equivalents		Short-Term Marketable Debt Securities		Long-Term Marketable Debt Securities
Cash and cash equivalents	$	675.6					$	675.6	$	675.6	$	—	$	—
Level 1 (a):
Money market funds		0.1		—		—		0.1		0.1		—		—
U.S. Treasury securities		27.1		—		—		27.1		3.1		11.5		12.5
Subtotal		27.2		—		—		27.2		3.2		11.5		12.5
Level 2 (b):
Certificates of deposit		3.9		—		—		3.9		—		3.9		—
Commercial paper		5.6		—		—		5.6		0.7		4.9		—
U.S. government agency securities		7.0		—		—		7.0		—		3.0		4.0
Corporate debt securities		106.2		—		—		106.2		—		64.6		41.6
Subtotal		122.7		—		—		122.7		0.7		76.4		45.6
Total	$	825.5	$	—	$	—	$	825.5	$	679.5	$	87.9	$	58.1

(a) Valuations based on quoted prices for identical assets and liabilities in active markets.

(b) Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

(c) Unrealized gains and losses were insignificant as of December 31, 2019. Therefore, the fair value approximates the adjusted cost basis for each major asset category.

For the year ended December 31, 2020 and 2019, net realized gains and losses on the sales and maturities of certain marketable debt securities were insignificant.  

The Company invests in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. The Company’s investment policy requires securities to be investment grade and limits the amount of credit exposure to any one issuer. The maturities of the Company’s long-term marketable debt securities generally range from one to two years.

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Fair values were determined for each individual marketable debt security in the investment portfolio. When evaluating a marketable debt security for other-than-temporary impairment, PCA reviews factors such as the duration and extent to which the fair value of the marketable debt security is less than its cost, the financial condition of the issuer and any changes thereto, the general market condition in which the issuer operates, and PCA's intent to sell or whether it will be more likely than not be required to sell, the marketable debt security before recovery of its amortized cost basis.

As of December 31, 2020 and 2019, we do not consider any of the impairments related to our marketable debt securities to be the result of credit losses. Therefore, we have not recorded an allowance for credit losses related to our marketable debt securities. All unrealized gains and losses were recorded in OCI. Additionally, we recorded no other-than-temporary impairment charges on our AFS securities for the year ended December 31, 2019 under prior year guidance ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities.

The following table provides information about the Company’s marketable debt securities that have been in a continuous loss position as of December 31, 2020 and 2019 (in millions, except number of marketable debt securities in a loss position):

	December 31, 2020						December 31, 2019
	Fair Value of Marketable Debt Securities		Number of Marketable Debt Securities in a Loss Position		Unrealized Losses (d)		Fair Value of Marketable Debt Securities		Number of Marketable Debt Securities in a Loss Position		Unrealized Losses (d)
Corporate debt securities	$	42.9		56	$	—	$	63.3		61	$	—
Commercial paper		2.2		1		—		0.8		1		—
U.S. Treasury securities		1.7		3		—		14.0		9		—
Certificates of deposit		1.3		2		—		—		—		—
	$	48.1		62	$	—	$	78.1		71	$	—

(d) Unrealized losses were insignificant for the periods ended December 31, 2020 and 2019.

12. Employee Benefit Plans and Other Postretirement Benefits

PCA has defined pension benefit plans for both salaried and hourly employees. The plans covering salaried employees are closed to new entrants with only certain current active participants still accruing benefits. The plans covering certain hourly employees are closed to new participants. We also have a Supplemental Executive Retirement Plan (SERP) and other nonqualified defined benefit pension plans that provide unfunded supplemental retirement benefits to certain of our current and former management employees. The SERP provides for incremental pension benefits in excess of those offered in our principal pension plans.

Other Postretirement Benefits

PCA provides postretirement medical benefits for certain retired salaried employees and postretirement medical and life insurance benefits for certain hourly employees. The plan covering salaried employees is closed to new participants.      

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Obligations and Funded Status of Defined Benefit Pension and Other Postretirement Benefits Plans

The funded status of PCA's plans change from year to year based on the plan asset investment return, contributions, benefit payments, the discount rate used to measure the liability, and expected participant longevity. The following table, which includes only company-sponsored defined benefit and other postretirement benefit plans, reconciles the beginning and ending balances of the projected benefit obligation and the fair value of plan assets. We recognize the unfunded status of these plans on the Consolidated Balance Sheets, and we recognize changes in funded status in the year changes occur through the Consolidated Statements of Comprehensive Income (dollars in millions):

	Pension Plans						Postretirement Plans
	Year Ended December 31						Year Ended December 31
	2020			2019			2020			2019
Change in Benefit Obligation:
Benefit obligation at beginning of period	$	1,420.1		$	1,204.9		$	14.5		$	14.6
Service cost		23.0			24.5			0.3			0.3
Interest cost		39.8			47.0			0.4			0.5
Plan amendments		1.3			2.3			—			(0.3	)
Actuarial (gain) loss (a)		132.0			188.6			(1.5	)		0.2
Participant contributions		—			—			0.9			1.1
Benefits paid		(50.6	)		(47.2	)		(1.5	)		(1.9	)
Benefit obligation at plan year end	$	1,565.6		$	1,420.1		$	13.1		$	14.5
Accumulated benefit obligation portion of above	$	1,520.4		$	1,374.4
Change in Fair Value of Plan Assets:
Plan assets at fair value at beginning of period	$	1,073.8		$	873.2		$	—		$	—
Actual return on plan assets		193.8			188.9			—			—
Company contributions		83.7			58.9			0.6			0.8
Participant contributions		—			—			0.9			1.1
Benefits paid		(50.6	)		(47.2	)		(1.5	)		(1.9	)
Fair value of plan assets at plan year end	$	1,300.7		$	1,073.8		$	—		$	—
Underfunded status	$	(264.9	)	$	(346.3	)	$	(13.1	)	$	(14.5	)
Amounts Recognized on Consolidated Balance Sheets:
Current liabilities		(1.2	)		(1.4	)		(0.6	)		(0.7	)
Noncurrent liabilities		(263.7	)		(344.9	)		(12.5	)		(13.8	)
Accrued obligation recognized at December 31	$	(264.9	)	$	(346.3	)	$	(13.1	)	$	(14.5	)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Prior service cost (credit)	$	21.7		$	24.7		$	(4.9	)	$	(5.3	)
Actuarial loss (gain)		223.5			239.2			(5.5	)		(4.4	)
Total	$	245.2		$	263.9		$	(10.4	)	$	(9.7	)

(a) For the year ended December 31, 2020, the most significant driver of the increase in benefit obligations for the plans was the actuarial losses due to the decrease in the discount rate assumption. The OPEB plans experienced a net actuarial gain primarily due to changes in demographic assumptions that were partially offset by the effect of the change in the discount rate assumption. For the year ended December 31, 2019, the benefit obligation loss for the pension plans was due largely to a decrease in the discount rate assumption and a change in the mortality assumption to adopt the Society of Actuaries’ newly released longevity study. For the OPEB plans, the net loss on the benefit obligation was driven by the decrease in the discount rate assumption partially offset by the effect of favorable demographic experience and the repeal of the excise tax originally implemented with the Affordable Care Act.

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Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss

The components of net periodic benefit cost and other comprehensive (income) loss (pretax) were as follows (dollars in millions):

	Pension Plans									Postretirement Plans
	Year Ended December 31,									Year Ended December 31,
	2020			2019			2018			2020			2019			2018
Service cost	$	23.0		$	24.5		$	25.0		$	0.3		$	0.3		$	0.3
Interest cost		39.8			47.0			42.4			0.4			0.5			0.5
Expected return on plan assets		(56.8	)		(52.1	)		(56.7	)		—			—			—
Net amortization of unrecognized amounts:
Prior service cost (credit)		4.3			6.3			6.9			(0.4	)		(0.3	)		(0.3	)
Actuarial loss (gain)		10.8			7.0			9.4			(0.4	)		(0.4	)		(0.2	)
Net periodic benefit cost	$	21.1		$	32.7		$	27.0		$	(0.1	)	$	0.1		$	0.3
Changes in plan assets and benefit obligations    recognized in other comprehensive (income)    loss:
Actuarial net loss (gain)	$	(5.0	)	$	51.8		$	(4.6	)	$	(1.5	)	$	0.2		$	(1.2	)
Prior service cost (credit)		1.3			2.3			3.0			—			(0.3	)		(0.3	)
Amortization of prior service cost (credit)		(4.3	)		(6.3	)		(6.9	)		0.4			0.3			0.3
Amortization of actuarial loss (gain)		(10.8	)		(7.0	)		(9.4	)		0.4			0.4			0.2
Total recognized in other comprehensive    loss (income) (b)	$	(18.8	)	$	40.8		$	(17.9	)	$	(0.7	)	$	0.6		$	(1.0	)
Total recognized in net periodic benefit    cost and other comprehensive loss (income)    (pre-tax)	$	2.3		$	73.5		$	9.2		$	(0.8	)	$	0.7		$	(0.7	)

(b) Accumulated losses in excess of 10% of the greater of the projected benefit obligation or the market-related value of assets will be recognized on a straight-line basis over the average remaining service period of active employees in PCA plans (which is between seven and nine years) and over the average remaining lifetime of inactive participants of Boise plans (which is between 23 and 26 years), to the extent that losses are not offset by gains in subsequent years.

The accumulated benefit obligations for the plans with obligations in excess of plan assets is $1.4 billion.

Assumptions

The following table presents the assumptions used in the measurement of our benefits obligations:

	Pension Plans			Postretirement Plans
	December 31,			December 31,
	2020	2019	2018	2020	2019	2018
Weighted-Average Assumptions Used to    Determine Benefit Obligations at    December 31:
Discount rate	2.57%	3.25%	4.31%	2.60%	3.18%	4.21%
Rate of compensation increase	4.00%	4.00%	4.00%	N/A	N/A	N/A
Weighted-Average Assumptions Used to    Determine Net Periodic Benefit Cost for the    Years Ended December 31:
Discount rate	3.25%	4.31%	3.66%	3.18%	4.21%	3.57%
Expected return on plan assets	5.29%	6.06%	6.06%	N/A	N/A	N/A
Rate of compensation increase	4.00%	4.00%	4.00%	N/A	N/A	N/A

Discount Rate Assumption. The discount rate reflects the current rate at which the pension obligations could be settled on the measurement date: December 31. The discount rate assumption used to calculate the present value of pension and postretirement benefit obligations reflects the rates available on high-quality, fixed-income debt instruments at December 31. In all periods, the bonds included in the models reflect anticipated investments that would be made to match the expected monthly

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benefit payments over time. The plans' projected cash flows were duration-matched to these models to develop an appropriate discount rate.

Asset Return Assumption. The expected return on plan assets reflects the expected long-term rates of return for the categories of investments currently held in the plans as well as anticipated returns for additional contributions made in the future. The expected long-term rate of return is adjusted when there are fundamental changes in expected returns on the plan investments. The weighted-average expected return on plan assets we will use in our calculation of 2021 net periodic pension benefit cost is 4.91%.

Rate of Compensation Increase. The rate of compensation increase is determined by PCA based upon annual reviews. The compensation increase assumption is not applicable for all plans as many of our pension plans are frozen and not accruing benefits.

Health Care Cost Trend Rate Assumptions. PCA assumed health care cost trend rates for its postretirement benefits plans were as follows:

	2020	2019	2018
Health care cost trend rate assumed for next year	6.82%	7.09%	7.24%
Rate to which the cost trend rate is assumed to decline    (the ultimate trend rate)	4.50%	4.50%	4.44%
Year that the rate reaches the ultimate trend rate	2029	2029	2028

Postretirement Health Care Plan Assumptions. For postretirement health care plan accounting, PCA reviews external data and its own historical trends for health care costs to determine the health care cost trend rate assumption.

Investment Policies and Strategies

PCA has retained the services of professional advisors to oversee pension investments and provide recommendations regarding investment strategy. PCA’s overall strategy and related apportionments between equity and debt securities may change from time to time based on market conditions, external economic factors, and the funded status of the plans. The general investment objective for all of our plan assets is to optimize growth of the pension plan trust assets, while minimizing the risk of significant losses to enable the plans to satisfy their benefit payment obligations over time. The objectives take into account the long-term nature of the benefit obligations, the liquidity needs of the plans, and the expected risk/return trade-offs of the asset classes in which the plans may choose to invest. Assets of our pension plans were invested in the following classes of securities at December 31, 2020 and 2019:

	Percentage of Fair Value at December 31,
	2020			2019
Fixed income securities		48	%		50	%
International equity securities		29	%		27	%
Domestic equity securities		21	%		22	%
Other		2	%		1	%

At December 31, 2020, the targeted investment allocations differed between the plans based on funded status. Our retirement committee reviews the investment allocations for reasonableness at a minimum, semi-annually.

Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility risk, all of which are subject to change. Due to the level of risk associated with some investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term, and such changes could materially affect the reported amounts.

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Fair Value Measurements of Plan Assets

The following tables set forth, by level within the fair value hierarchy, discussed in Note 2, Summary of Significant Accounting Policies, the pension plan assets, by major asset category, at fair value at December 31, 2020 and 2019 (dollars in millions):

	Fair Value Measurements at December 31, 2020
Asset Category	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Net Asset Value (NAV) (a)		Total
Short-term investments	$	—	$	25.1	$	—	$	—	$	25.1
Common/collective trust funds:
International equities		198.4		32.8		—		136.9		368.1
Domestic equities		—		276.9		—		—		276.9
Corporate and government bonds:
Corporate bonds		—		318.3		—		—		318.3
Government bonds and agencies		—		243.4		—		—		243.4
Fixed income		—		49.4		—		—		49.4
Municipal bonds		—		15.9		—		—		15.9
Private equity securities (b)		—		—		2.0		—		2.0
Total securities at fair value	$	198.4	$	961.8	$	2.0	$	136.9	$	1,299.1
Accrued income										1.6
Total fair value of plan assets									$	1,300.7

	Fair Value Measurements at December 31, 2019
Asset Category	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Net Asset Value (NAV) (a)		Total
Cash and short-term investments	$	—	$	14.9	$	—	$	—	$	14.9
Common/collective trust funds:
International equities		163.0		20.8		—		102.3		286.1
Domestic equities		—		240.5		—		—		240.5
Corporate and government bonds:
Fixed income		140.4		154.6		—		—		295.0
Government bonds and agencies		—		160.7		—		—		160.7
Corporate bonds		—		70.6		—		—		70.6
Municipal bonds		—		5.8				—		5.8
Private equity securities (b)		—		—		2.6		—		2.6
Total securities at fair value	$	303.4	$	667.9	$	2.6	$	102.3	$	1,076.2
Accrued expenses and receivables										(2.4	)
Total fair value of plan assets									$	1,073.8

(a) In accordance with ASC 820, Fair Value Measurement, certain investments that do not have readily-determinable fair values are measured at fair value using the net asset value (NAV) per share practical expedient and are not classified within the fair value hierarchy.

(b) Investments in this category are invested in the Pantheon Global Secondary Fund IV, LP. The fund specializes in investments in the private equity secondary market and occasionally directly in private companies to maximize capital growth. Fund investments are carried at fair value as determined quarterly using the market approach to estimate the fair value of private investments. The market approach utilizes prices and other relevant information generated by market transactions, type of security, size of the position, degree of liquidity, restrictions on the disposition, latest round of financing data, current financial position, and operating results, among other factors. In circumstances where fair values are not provided with respect to any of the company's fund investments, the investment advisor will seek to determine the fair value of such investments based on information provided by the general partners or managers of such funds or from other sources. Audited financial statements are provided by fund management annually. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the ultimate underlying investee companies means that there are inherent difficulties in determining the value of the investments. Amounts realized on the sale of these

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investments may differ from the calculated values. Boise had originally committed to a $15.0 million investment, with $2.0 million of the commitment unfunded at December 31, 2020.

The following table sets forth a summary of changes in the fair value of the pension plans' Level 3 assets for the year ended December 31, 2020 (dollars in millions):

	2020
Balance, beginning of year	$	2.6
Acquisitions		—
Purchases		—
Sales		(0.6	)
Unrealized gain		—
Balance, end of year	$	2.0

Funding and Cash Flows

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 discretionary contributions based on the funded status of the plans, tax deductibility, income from operations, and other factors. In 2020, 2019, and 2018, we made contributions of $82.5 million, $57.9 million, and $21.8 million, respectively, to our qualified pension plans. We do not have a required minimum contribution amount established for 2021, but we expect to make discretionary contributions to our plans.

The following are estimated benefit payments to be paid to current plan participants by year (dollars in millions). Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the Company.

	Pension Plans		Postretirement Plans
2021	$	56.5	$	0.5
2022		60.2		0.5
2023		63.9		0.5
2024		67.0		0.5
2025 - 2030		456.2		3.4

Defined Contribution Plans

Some of our employees participate in contributory defined contribution savings plans, available to most of our salaried and hourly employees. The defined contribution plans permit participants to make contributions by salary reduction pursuant to Section 401(k) of the Code. PCA made employer-matching contributions of $40.8 million, $39.0 million, and $36.8 million in 2020, 2019, and 2018, respectively. All company-matching contributions to all employees were made in cash. We expense employer matching contributions and charge dividends on shares held by the ESOP to retained earnings. Shares of company stock held by the ESOP are included in basic shares for earnings-per-share computations. At December 31, 2020 and 2019, the ESOP held 1.2 million and 1.5 million shares of Company stock, respectively.

Certain salaried and hourly employees that are not participating in a PCA sponsored defined benefit pension plan receive a service-related company retirement contribution to their defined contribution plan account in addition to any employer matching contribution. This contribution increases with years of service and ranges from 3% to 5% of base pay. We contributed $39.4 million, $36.7 million, and $33.3 million for this retirement contribution during the years ended December 31, 2020, 2019, and 2018, respectively.

Deferred Compensation Plans

Key managers can elect to participate in a deferred compensation plan. The deferred compensation plan is unfunded; therefore, benefits are paid from our general assets. At December 31, 2020 and 2019, we had $22.6 million and $17.4 million, respectively, of liabilities attributable to participation in our deferred compensation plan on our Consolidated Balance Sheets.

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13. Asset Retirement Obligations

Our asset retirement obligations relate predominantly to landfill closure, wastewater treatment pond dredging, closed-site monitoring costs, and certain leasehold improvements. In accordance with ASC 410, Asset Retirement and Environmental Obligations, we recognize the fair value of these liabilities as an asset retirement obligation and capitalize that cost as part of the cost basis of the related asset in the period in which the costs are incurred if sufficient information is available to reasonably estimate the fair value of the obligation. Fair value estimates are determined using Level 3 inputs in the fair value hierarchy. The fair value of our asset retirement obligations is measured using expected future cash outflows discounted using the Company's credit-adjusted risk-free interest rate. Over time, the liability is accreted to its settlement value, and the capitalized cost is depreciated over the useful life of the related asset. These liabilities are based on the best estimate of costs and are updated periodically to reflect current technology, laws and regulations, inflation, and other economic factors. Occasionally, we become aware of events or circumstances that require us to revise our future estimated cash flows. When revisions become necessary, we recalculate our obligation and adjust our asset and liability accounts utilizing appropriate discount rates. No assets are legally restricted for purposes of settling asset retirement obligations. Upon settlement of the liability, we will recognize a gain or loss for any difference between the settlement amount and the liability recorded.

The following table describes changes to the asset retirement obligation liability (dollars in millions):

	Year Ended December 31,
	2020			2019
Asset retirement obligation at beginning of period	$	27.8		$	30.0
Accretion expense		1.3			1.5
Payments		(0.8	)		(3.5	)
Revisions in estimated cash flows (a)		3.5			(0.2	)
Asset retirement obligation at end of period	$	31.8		$	27.8

(a) For 2020, primarily consists of an adjustment of $4.5 million related to the San Lorenzo, California facility closure.

We have additional asset retirement obligations with indeterminate settlement dates. The fair value of these asset retirement obligations cannot be estimated due to the lack of sufficient information to estimate the settlement dates of the obligations. These asset retirement obligations include, for example, (i) removal and disposal of potentially hazardous materials related to equipment and/or an operating facility if the equipment and/or facilities were to undergo major maintenance, renovation, or demolition and (ii) storage sites or owned facilities for which removal and/or disposal of chemicals and other related materials are required if the operating facility is closed. We will recognize a liability in the period in which sufficient information becomes available to reasonably estimate the fair value of these obligations.

14. Share-Based Compensation

The Company has a long-term equity incentive plan, which allows for grants of stock options, stock appreciation rights, restricted stock, and performance awards to directors, officers, and employees, as well as others who engage in services for PCA. On February 25, 2020, our board of directors approved and, on May 5, 2020, our stockholders approved, the amendment and restatement of the plan. The amendment extended the plan’s term to May 5, 2030 and increased the number of shares of common stock available for issuance under the plan by 1.4 million shares. The total number of shares authorized for past and future awards is 12.0 million shares.

As of December 31, 2020, assuming performance units are measured at the target level of performance, 1.5 million shares remained available for future issuance under the current plan. Forfeitures are added back to the pool of shares of common stock available to be granted at a future date.

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Restricted Stock

Restricted stock awards granted to officers and employees generally vest at the end of a four-year period, and restricted stock awards granted to directors vest immediately. A summary of the Company’s restricted stock activity follows:

	2020					2019					2018
	Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value
Restricted stock at January 1		716,952		$	94.50		743,591		$	86.90		739,732		$	77.23
Granted		204,960			94.25		199,499			95.48		173,144			114.63
Vested (a)		(244,823	)		72.11		(212,809	)		68.59		(165,547	)		72.84
Forfeitures		(7,987	)		99.94		(13,329	)		98.86		(3,738	)		78.66
Restricted stock at December 31		669,102		$	102.55		716,952		$	94.50		743,591		$	86.90

(a) The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $23.6 million, $19.9 million, and $18.9 million, respectively.

Performance Units

Performance unit awards granted to certain key employees are earned based on the achievement of defined performance rankings of Return on Invested Capital (ROIC) or Total Shareholder Return (TSR) compared to ROIC and TSR for peer companies. ROIC performance unit awards vest four years after the grant date, while TSR performance unit awards vest approximately three years after the grant date. Both ROIC and TSR performance units are paid out entirely in shares of the Company’s common stock. A summary of the Company’s performance unit activity follows:

	2020					2019					2018
	Units			Weighted Average Grant- Date Fair Value		Units			Weighted Average Grant- Date Fair Value		Units			Weighted Average Grant- Date Fair Value
Performance units at January 1		323,147		$	96.56		266,704		$	90.01		226,558		$	77.07
Granted		111,287			99.20		109,545			97.24		83,515			115.35
Vested (b)		(77,017	)		67.57		(53,102	)		65.03		(43,369	)		71.19
Performance units at December 31		357,417		$	103.63		323,147		$	96.56		266,704		$	90.01

(b) The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $8.5 million, $5.5 million, and $5.4 million, respectively. Upon vesting of the awards in 2020, 2019, and 2018, PCA issued 86,015 shares, 59,165 shares, and 46,876 shares, respectively. For 2020, 2019, and 2018, these amounts included 8,998 shares, 6,063 shares, and 3,507 shares, respectively, for dividends accrued during the vesting period.

Compensation Expense

Our share-based compensation expense is recorded in “Cost of sales” and “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):

	Year Ended December 31,
	2020			2019			2018
Restricted stock	$	20.1		$	22.6		$	18.6
Performance units		9.9			7.8			4.9
Impact on income before income taxes		30.0			30.4			23.5
Income tax benefit		(7.6	)		(7.6	)		(5.9	)
Impact on net income	$	22.4		$	22.8		$	17.6

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The fair value of restricted stock is determined based on the closing price of the Company’s stock on the grant date. Compensation expense, net of estimated forfeitures, is recorded over the requisite service period. As PCA’s Board of Directors has the ability to accelerate the vesting of these awards upon an employee’s retirement, the Company accelerates the recognition of compensation expense for certain employees approaching normal retirement age.

For performance unit awards made in 2020. 2019, and 2018, in terms of grant date value, 50% used TSR as the performance measure and 50% used ROIC as the performance measure. All units awarded before 2018 used ROIC as the performance measure. The ROIC component of performance unit awards are valued based on the closing price of the stock on the grant date. As the ROIC component contains a performance condition, compensation expense, net of estimated forfeitures, is recorded over the requisite service period based on the most probable number of awards expected to vest. The TSR component of performance unit awards is valued using a Monte Carlo simulation as the TSR component contains a market condition. The Monte Carlo simulation estimates the fair value of the TSR component based on the expected term of the award, a risk-free interest rate, expected dividends, and expected volatility of the Company’s common stock and the common stock of the peer companies. Compensation expense is recorded ratably over the expected term of the award.

The unrecognized compensation expense for all share-based awards was as follows (dollars in millions):

	December 31, 2020
	Unrecognized Compensation Expense		Remaining Weighted Average Recognition Period (in years)
Restricted stock	$	25.8	2.5
Performance units		17.6	2.2
Total unrecognized share-based compensation expense	$	43.4		2.3

We evaluate share-based compensation expense on a quarterly basis based on our estimate of expected forfeitures, review of recent forfeiture activity, and expected future turnover. We recognize the effect of adjusting the forfeiture rate for all expense amortization in the period that we change the forfeiture estimate. The effect of forfeiture adjustments was insignificant in all periods presented.

15. Derivative Instruments and Hedging Activities

Hedging Strategy

When appropriate, we use derivatives as a risk management tool to mitigate the potential impact of certain market risks. The primary risks managed by using derivative financial instruments are interest rate risks. We do not enter into derivative financial instruments for trading or speculative purposes.

Interest Rate Risk

The Company has used treasury lock derivative instruments to manage interest costs and the risk associated with changing interest rates. In connection with contemplated issuances of ten-year debt securities, PCA entered into interest rate protection agreements with counterparties in 2008, 2010, and 2011 to protect against increases in the ten-year U.S. Treasury Note rate. These treasury rates served as references in determining the interest rates applicable to the debt securities the Company issued in March 2008 and June 2012. As a result of changes in the interest rates on those treasury securities between the time PCA entered into the derivative agreements and the time PCA priced and issued the debt securities, the Company: (1) made a payment of $4.4 million to the counterparty upon settlement of the 2008 interest rate protection agreement on March 25, 2008; (2) received a payment of $9.9 million from the counterparties upon settlement of the 2010 interest rate protection agreements on February 4, 2011; and (3) made a payment of $65.5 million to the counterparty upon settlement of the 2011 interest rate protection agreement on June 26, 2012. The Company recorded the effective portion of the settlements in accumulated OCI, and these amounts were amortized over the terms of the respective notes.

During the fourth quarter of 2019, the Company recorded a charge of $13.1 million in interest expense from the write-off of the remaining treasury lock balance due to the redemption of the 3.90% notes on December 23, 2019. The Company has not entered into any new interest rate protection agreements subsequent to the fourth quarter 2019 write-off of the remaining treasury lock balance.

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Derivative Instruments

The impact of derivative instruments on the consolidated statements of income and accumulated OCI was as follows (dollars in millions):

	Loss Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended December 31,
	2020		2019			2018
Amortization of treasury locks (included in interest    expense, net)	$	—	$	(18.2	)	$	(5.3	)

As a result of our November 2019 debt refinancing and redemption of the 3.90% notes due June 15, 2022, the Company accelerated the amortization of the remaining treasury lock balance of $13.1 million ($6.5 million after tax) during the fourth quarter of 2019. The after tax amount includes $3.2 million of income tax benefit from the stranded tax effects in accumulated OCI related to the write-off of the remaining treasury lock balance. 

16. Stockholders' Equity

Dividends

During the year ended December 31, 2020, we paid $299.6 million of dividends to shareholders. On December 10, 2020, PCA announced an increase of its quarterly cash dividend on its common stock from an annual rate of $3.16 per share to $4.00 per share. Also, on December 10, 2020, PCA's Board of Directors approved a regular quarterly cash dividend of $1.00 per share of common stock, which was paid on January 15, 2021 to shareholders of record as of December 21, 2020. The dividend payment was $94.8 million.

Share Repurchase Program

On February 25, 2016, PCA announced that its Board of Directors authorized the repurchase of $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.

The Company did not repurchase any shares of its common stock under this authority during the twelve months ended December 31, 2020 and 2019. All shares repurchased in prior years have been retired. At December 31, 2020, $193.0 million of the authorized amount remained available for repurchase of the Company's common stock.

Accumulated Other Comprehensive Income (Loss)

Changes in AOCI, net of taxes, by component follows (dollars in millions). Amounts in parentheses indicate losses.

	Foreign Currency Translation Adjustments			Unrealized Loss on Treasury Locks, Net			Unrealized Loss on Foreign Exchange Contracts			Unrealized Loss on Marketable Debt Securities		Unfunded Employee Benefit Obligations			Total
Balance at January 1, 2019	$	(0.4	)	$	(10.2	)	$	(0.3	)	$	—	$	(127.9	)	$	(138.8	)
Other comprehensive income before reclassifications		—			—			—			—		(40.5	)		(40.5	)
Amounts reclassified from AOCI		—			10.2			0.1			—		9.5			19.8
Net current-period other comprehensive income (loss)		—			10.2			0.1			—		(31.0	)		(20.7	)
Balance at December 31, 2019	$	(0.4	)	$	—		$	(0.2	)	$	—	$	(158.9	)	$	(159.5	)
Other comprehensive income before reclassifications		—			—			—			0.3		4.0			4.3
Amounts reclassified from AOCI		—			—			—			—		10.7			10.7
Net current-period other comprehensive income		—			—			—			0.3		14.7			15.0
Balance at December 31, 2020	$	(0.4	)	$	—		$	(0.2	)	$	0.3	$	(144.2	)	$	(144.5	)

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The following table presents information about reclassifications out of AOCI (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income.

	Amounts Reclassified from AOCI Year Ended December 31,
Details about AOCI Components	2020			2019
Unrealized loss on treasury locks, net (a)	$	—		$	(18.1	)
		—			7.9		Tax benefit
	$	—		$	(10.2	)	Net of tax
Unfunded employee benefit obligations (b)
Amortization of prior service costs	$	(3.9	)	$	(6.0	)
Amortization of actuarial gains / (losses)		(10.4	)		(6.7	)
		(14.3	)		(12.7	)	Total before tax
		3.6			3.2		Tax benefit
	$	(10.7	)	$	(9.5	)	Net of tax

(a) For 2019, this AOCI component is included in interest expense, net. The amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The remaining balances of the treasury locks were written off as a result of the Company’s November 2019 debt refinancing. For a discussion of treasury lock derivative instrument activity, see Note 15, Derivative Instruments and Hedging Activities, for additional information.

(b) These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

17. 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 represented approximately 5% and 7% of our total Company sales for 2020 and 2019, respectively, and about 45% and 50% of our Paper segment sales revenue for those periods, respectively. At December 31, 2020 and 2019, we had $39.6 million and $76.2 million of accounts receivable due from Office Depot, respectively, which represents approximately 5% and 9% of our total Company receivables, respectively.

In 2020, sales to Office Depot represented about 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.

Labor

At December 31, 2020, we had approximately 15,200 employees and approximately 44% of these employees worked pursuant to collective bargaining agreements. Approximately 62% of our hourly employees are represented by unions. The majority of our unionized employees are represented by the United Steel Workers (USW), the International Brotherhood of Teamsters (IBT), the International Association of Machinists (IAM), and the Association of Western Pulp and Paper Workers (AWPPW). Approximately 11% of our employees work pursuant to collective bargaining agreements that will expire within the next twelve months.

18. 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 non-inventory working capital items) on our Consolidated Balance Sheets were $2.5 million at December 31, 2020 and $3.9 million at December 31, 2019. For 2020, 2019, and 2018, we recorded $70.6 million, $81.7 million, and $83.1 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”.

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Fiber purchases from related parties were $12.6 million for 2020 and $16.8 million for both 2019 and 2018. 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.

19. 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.

During the fourth quarter of 2020, due to an increase in demand for our corrugated products and as part of our assessment of a potential conversion to produce containerboard, we began producing high-performance, virgin kraft linerboard on the No. 3 machine at our Jackson, Alabama mill on a trial basis. Before October 2020, operating results for the Jackson mill were included in the Paper segment. Beginning in October 2020, operating results for the Jackson mill are included in both the Packaging and Paper segments.

During the second quarter of 2018, the Company discontinued the production of paper grades at the Wallula, Washington mill and converted the No. 3 machine at the mill to produce virgin kraft linerboard. Before May 2018, operating results for the Wallula mill were included in the Paper segment. After May 2018, operating results for the Wallula mill are primarily included in the Packaging segment.

Packaging. We manufacture and sell a wide variety of containerboard and corrugated packaging products, including conventional shipping containers used to protect and transport manufactured goods, multi-color boxes and displays with strong visual appeal that help to merchandise the packaged product in retail locations. In addition, we are a large producer of packaging for meat, fresh fruit and vegetables, processed food, beverages, and other industrial and consumer products.

Paper. We manufacture and sell a range of communication-based papers. Our papers can be manufactured as either commodity papers or specialty papers with specialized or custom features, such as colors, coatings, high brightness, or recycled content.

Corporate and Other. Our Corporate and Other segment includes corporate support staff services and related assets and liabilities, and foreign exchange gains and losses. This segment also includes transportation assets, such as rail cars and trucks, which we use to transport our products from some of our manufacturing sites and assets related to LTP. See Note 18, Transactions with Related Parties, for more information related to LTP. Sales in this segment relate primarily to LTP and our rail and truck business. We provide transportation services not only to our own facilities but also, on a limited basis, to third parties when geographic proximity and logistics are favorable. Rail cars and trucks are generally leased.

Each segments' profits and losses are measured on operating profits before interest expense, net and other and income taxes. For many of these allocated expenses, the related assets and liabilities remain in the Corporate and Other segment.

Segment sales to external customers by product line were as follows (dollars in millions):

	Year Ended December 31,
	2020		2019		2018
Packaging	$	5,919.5	$	5,932.2	$	5,938.5
Paper		674.8		964.3		1,002.0
Corporate and Other		63.9		67.8		74.1
	$	6,658.2	$	6,964.3	$	7,014.6

Sales to foreign unaffiliated customers during the years ended December 31, 2020, 2019, and 2018 were $318.7 million, $394.9 million, and $487.8 million, respectively. At December 31, 2020 and 2019, we did not have any significant long-lived assets held by foreign operations.

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An analysis of operations by reportable segment is as follows (dollars in millions):

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2020	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,901.7	$	17.8		$	5,919.5		$	829.5		(a)	$	365.2	$	394.8	$	5,744.0
Paper		674.7		0.1			674.8			(20.0	)	(b)(c)		36.5		20.1		497.2
Corporate and Other		81.8		131.3			213.1			(85.6	)			8.3		6.3		1,192.0
Intersegment eliminations		—		(149.2	)		(149.2	)		—				—		—		—
	$	6,658.2	$	—		$	6,658.2			723.9			$	410.0	$	421.2	$	7,433.2
Non-operating pension income										2.3
Interest expense, net										(93.5	)
Income before taxes									$	632.7

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2019	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,905.1	$	27.1		$	5,932.2		$	963.4		(d)	$	342.8	$	367.4	$	5,491.5
Paper		964.3		—			964.3			175.4		(e)		37.7		23.8		791.4
Corporate and Other		94.9		133.1			228.0			(85.1	)			7.0		8.3		952.9
Intersegment eliminations		—		(160.2	)		(160.2	)		—				—		—		—
	$	6,964.3	$	—		$	6,964.3			1,053.7			$	387.5	$	399.5	$	7,235.8
Non-operating pension expense										(7.9	)
Interest expense, net										(128.8	)	(f)
Income before taxes									$	917.0

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2018	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,912.3	$	26.2		$	5,938.5		$	1,045.4		(g)	$	342.0	$	504.0	$	5,347.0
Paper		1,002.0		—			1,002.0			97.7		(h)		62.0		12.6		760.1
Corporate and Other		100.3		129.4			229.7			(75.4	)	(i)		6.9		34.8		462.6
Intersegment eliminations		—		(155.6	)		(155.6	)		—				—		—		—
	$	7,014.6	$	—		$	7,014.6			1,067.7			$	410.9	$	551.4	$	6,569.7
Non-operating pension expense										(2.1	)
Interest expense, net										(95.1	)
Income before taxes									$	970.5

(a)     Includes the following:

o $27.3 million of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility during the second quarter of 2020.

o $10.0 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.

o $6.3 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

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(b)     Includes the following:

o $0.8 million of restructuring costs for paper administrative functions.

o $0.6 million incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(c)     During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.

(d)     Includes the following:

o $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

o $0.8 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

o $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility.

(e)     Includes $0.2 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side           white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(f)     Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs.

(g)     Includes the following:

o $12.3 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

o $1.6 million of charges consisting of closure costs related to corrugated products facilities.

o $0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities.

o $0.2 million of charges for acquisition and integration costs related to recent acquisitions.

(h)     Includes $17.7 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(i)     Includes $0.2 million of charges consisting of closure costs related to a corporate administration facility.

(j)     Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisitions of businesses, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.

20. 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 (discussed in Note 10, Debt), lease obligations (discussed in Note 3, Leases), capital commitments, purchase commitments for goods and services, and legal proceedings (discussed below).

Capital Commitments

The Company had capital commitments of approximately $304.2 million and $212.6 million as of December 31, 2020 and 2019, respectively, in connection with the expansion and replacement of existing facilities and equipment.

Purchase Commitments

In the table below, we set forth our enforceable and legally binding purchase obligations as of December 31, 2020. Some of the amounts are based on management's estimates and assumptions about these obligations, including their duration, the possibility of renewal, anticipated actions by third parties, and other factors. Because these estimates and assumptions are necessarily subjective, our actual payments may vary from those reflected in the table. Purchase orders made in the ordinary

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course of business are excluded below. Any amounts for which we are liable under purchase orders are reflected on the Consolidated Balance Sheets as accounts payable and accrued liabilities. These obligations relate to various purchase agreements for items such as minimum amounts of energy and fiber purchases over periods ranging from one year to 31 years. Total purchase commitments were as follows (dollars in millions):

2021	$	53.5
2022		48.2
2023		48.0
2024		27.3
2025		26.8
Thereafter		79.8
Total	$	283.6

The Company purchased a total of $317.6 million, $315.0 million, and $341.9 million during the years ended December 31, 2020, 2019, and 2018, respectively, under these purchase agreements.

Environmental Matters

On August 8, 2019, the EPA issued a notice of violation (NOV) alleging violations of the Clean Air Act, resulting from an inspection at our Wallula, Washington mill in September 2018. PCA denies the violations set forth in the NOV and has requested that the EPA’s Office of Air Quality Planning and Standards provide an applicability determination to clarify that the relevant operations of PCA have not violated the regulations at issue in the NOV. The EPA denied our request in 2020. We intend to vigorously defend any enforcement action and, on July 27, 2020, filed a petition with the EPA to reconsider its denial of our applicability determination and filed petitions in U.S. federal court to review the agency’s denial of our applicability determination as well as the rule at issue. While we cannot predict with certainty the ultimate resolution of this matter, we believe that we have a meritorious position that our operations have not violated the Clean Air Act, that we have taken appropriate action to address the matters raised by the EPA in the NOV, and that this matter will not result in a material adverse effect on our financial condition, results of operations, or cash flows.

The potential costs for various environmental matters are uncertain due to such factors as the unknown magnitude of possible cleanup costs, the complexity and evolving nature of governmental laws and regulations and their interpretations, and the timing, varying costs and effectiveness of alternative cleanup technologies. From 2006 through 2020, there were no significant environmental remediation costs at PCA's mills and corrugated plants. At December 31, 2020, the Company had $23.6 million of environmental-related reserves recorded on its Consolidated Balance Sheet. Of the $23.6 million, approximately $15.5 million related to environmental-related asset retirement obligations discussed in Note 13, Asset Retirement Obligations, and $8.1 million related to our estimate of other environmental contingencies. The Company recorded $4.6 million in “Accrued liabilities” and $19.0 million in “Other long-term liabilities” on the Consolidated Balance Sheet. Liabilities recorded for environmental contingencies are estimates of the probable costs based upon available information and assumptions. Because of these uncertainties, PCA’s estimates may change. The Company believes that it is not reasonably possible that future environmental expenditures for remediation costs and asset retirement obligations above the $23.6 million accrued as of December 31, 2020 will have a material impact on its financial condition, results of operations, or cash flows.

Guarantees and Indemnifications

We provide guarantees, indemnifications, and other assurances to third parties in the normal course of our business. These include tort indemnifications, environmental assurances, and representations and warranties in commercial agreements. At December 31, 2020, 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.

DeRidder Mill Incident

On February 8, 2017, a tank located in the pulp mill at the Company's DeRidder, Louisiana facility exploded, resulting in three contractor fatalities and other injuries. The Company has been served with multiple lawsuits involving the decedents and other allegedly injured parties, alleging negligence on the part of the Company and claiming compensatory and punitive damages. The Company is vigorously defending these lawsuits. The Company believes that these suits are covered by its liability insurance policies, subject to an aggregate $1.0 million deductible, which has been satisfied in full as a result of settlement of various lawsuits and fees and expenses incurred by the Company. All pending lawsuits are in the early stages. Accordingly, the Company is unable to estimate a range of reasonable possible losses at this time.

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The Company has cooperated with investigations from the U.S. Occupational Health and Safety Administration (OSHA), the U.S. Chemical Safety Board (CSB) and the U.S. Environmental Protection Agency (EPA). The U.S. Chemical Safety Board completed its investigation and issued its report during the second quarter of 2018. The Company settled with OSHA during the second quarter of 2018 and paid approximately $40,000 in penalties for citations.

The EPA investigation is ongoing. In May 2017, the U.S. Environmental Protection Agency (EPA) conducted an on-site inspection of the facility to assess compliance with the Clean Air Act, Risk Management Program (RMP). The Company provided additional information to the EPA promptly after the inspection to address certain areas of concern (AOCs) observed during the inspection. In January 2021, the EPA and U.S. Department of Justice (DOJ) initiated civil judicial enforcement discussions with PCA. These discussions are ongoing. As of the date of filing of this report, no complaint has been filed. PCA continues to cooperate with the agencies. Since the inspection in 2017, PCA performed several voluntary activities to address the AOCs presented in the EPA’s inspection report and has removed the RMP covered process from the facility.

Legal Proceedings

We are also a party to various legal actions arising in the ordinary course of our business. These legal actions include commercial liability claims, premises liability claims, 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.

21. Quarterly Results of Operations (unaudited, dollars in millions, except per-share and stock price information)

2020:	First (a)		Second (b)		Third (c)		Fourth (d)		Total
Net sales	$	1,708.7	$	1,541.6	$	1,693.7	$	1,714.2	$	6,658.2
Gross profit		365.0		325.8		345.4		333.3		1,369.4
Income from operations		209.1		116.1		209.5		189.3		723.9
Net income		141.7		56.7		139.1		123.5		461.0
Basic earnings per share		1.50		0.60		1.47		1.30		4.86
Diluted earnings per share		1.49		0.59		1.46		1.30		4.84
Stock price - high		112.89		112.80		114.32		138.95		138.95
Stock price - low		71.05		80.17		92.02		106.08		71.05

2019:	First (e)		Second		Third (f)		Fourth (g)		Total
Net sales	$	1,733.7	$	1,759.9	$	1,750.7	$	1,720.0	$	6,964.3
Gross profit		421.4		427.9		411.4		383.3		1,644.0
Income from operations		275.4		280.4		262.8		235.1		1,053.7
Net income		186.8		193.6		179.8		136.2		696.4
Basic earnings per share		1.98		2.05		1.90		1.44		7.36
Diluted earnings per share		1.97		2.04		1.89		1.43		7.34
Stock price - high		101.84		103.80		109.37		114.78		114.78
Stock price - low		81.87		87.85		96.30		100.54		81.87

Note: The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in the weighted average shares outstanding throughout the year.

(a) Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

(b) Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

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(c) Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

(d) Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

(e) Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

(f) Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

(g) Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

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Item 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

Not applicable.

Item 9A. CONTROLS AND PROCEDURES

Controls and Procedures

PCA maintains disclosure controls and procedures (as defined in Rule 13a-15(e) of the Securities Exchange Act of 1934) that are designed to provide reasonable assurance that information required to be disclosed in PCA’s filings under the Securities Exchange Act is recorded, processed, summarized and reported within the periods specified in the rules and forms of the SEC and that such information is accumulated and communicated to PCA’s management, including its Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Prior to filing this report, PCA completed an evaluation under the supervision and with the participation of PCA’s management, including PCA’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of PCA’s disclosure controls and procedures as of December 31, 2020. The evaluation of PCA’s disclosure controls and procedures included a review of the controls’ objectives and design, PCA’s implementation of the controls and the effect of the controls on the information generated for use in this report. Based on this evaluation, PCA’s Chief Executive Officer and Chief Financial Officer concluded that PCA’s disclosure controls and procedures were effective at the reasonable assurance level as of December 31, 2020.

During the quarter ended December 31, 2020, there were no changes in internal controls over financial reporting that have materially affected, or are reasonably likely to materially affect, PCA’s internal control over financial reporting.

Management’s Report on Internal Control Over Financial Reporting

PCA’s management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the Company’s assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only with proper authorizations; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the Company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, PCA’s internal control over financial reporting may not prevent or detect misstatements. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that objectives of the control system are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, have been detected. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls become inadequate because of changes in conditions, or that the degree of compliance with the policies and procedures may deteriorate.

PCA’s management, under the supervision of and with the participation of the Chief Executive Officer and Chief Financial Officer, assessed the Company’s internal control over financial reporting as of December 31, 2020, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on this assessment, PCA’s management concluded that its internal control over financial reporting was effective as of December 31, 2020, based on the specified criteria.

KPMG LLP, the independent registered public accounting firm that audited PCA’s financial statements included in this Form 10-K, has also audited the effectiveness of the Company’s internal control over financial reporting. Their attestation report precedes PCA’s audited financial statements included elsewhere in this report.

Item 9B. OTHER INFORMATION

None.

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PART III

Item 10. DIRECTORS, EXECUTIVE OFFICERS, AND CORPORATE GOVERNANCE

Information regarding PCA’s executive officers required by this Item 10 is set forth in Item 1 of Part I of this report under the caption “Executive Officers of the Registrant.”

The following information required by this Item 10 will be included in PCA’s Proxy Statement for the 2021 Annual Meeting of Stockholders and is incorporated by reference herein:

• Information regarding PCA’s directors included under the caption “Election of Directors”

• Information regarding PCA’s Audit Committee and financial experts included under the caption “Election of Directors - Audit Committee”

• Information regarding PCA’s codes of ethics included under the caption “Election of Directors - Code of Ethics”

• Information regarding PCA’s stockholder nominating procedures included under the captions “Election of Directors - Nominating and Governance Committee,” “Other Information - Recommendations for Board - Nominated Director Nominees,” and “Other Information - Procedures for Nominating Directors or Bringing Business Before the 2022 Annual Meeting”

• Information regarding compliance with Section 16(a) of the Securities Exchange Act of 1934 included under the caption “Delinquent Section 16(a) Reports”

Item 11. EXECUTIVE COMPENSATION

Information with respect to executive compensation required by this Item 11 will be included in PCA’s Proxy Statement under the captions “Compensation Discussion and Analysis,” “Executive Officer and Director Compensation” (including all subcaptions and tables thereunder) and “Board Committees - Compensation Committee” and is incorporated herein by reference.

Item 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Information with respect to security ownership of certain beneficial owners and management required by this Item 12 will be included in PCA’s Proxy Statement under the caption “Ownership of Our Stock” and is incorporated herein by reference.

Authorization of Securities under Equity Compensation Plans — Securities authorized for issuance under our equity compensation plans at December 31, 2020 are as follows:

	Column
	A		B		C
Plan Category	Number of Securities to Be Issued Upon Exercise of Outstanding Options, Warrants, and Rights (a)		Weighted Average Exercise Price of Outstanding Options, Warrants, and Rights		Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column A)
Equity compensation plans approved    by securityholders		—	$	—		1,498,417
Equity compensation plans not    approved by securityholders	N/A		N/A		N/A
Total		—	$	—		1,498,417

(a) Assumes that outstanding performance units pay out at the target level. Does not include 1,026,519 shares of unvested restricted stock and performance units granted pursuant to our Amended and Restated 1999 Long-Term Equity Incentive Plan.

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Item 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Information with respect to certain relationships and related transactions and director independence required by this Item 13 will be included in PCA’s Proxy Statement under the captions “Transactions with Related Persons” and “Election of Directors - Determination of Director Independence,” respectively, and is incorporated herein by reference.

Item 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

Information with respect to fees and services of the principal accountant required by this Item 14 will be included in PCA’s Proxy Statement under the caption “Ratification of Appointment of the Independent Registered Public Accounting Firm” under the subcaptions “- Fees to the Independent Registered Public Accounting Firm” and “- Audit Committee Preapproval Policy for Audit and Non-Audit Fees” and are incorporated herein by reference.

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PART IV

Item 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as a part of this report:

(1) The financial statements listed in the “Index to Financial Statements.”

(2) Financial Statement Schedule.

All schedules for which provision is made in the applicable accounting regulations of the Securities and Exchange Commission are not required under the related instructions, are inapplicable or not material, or the information called for thereby is otherwise included in the financial statements or the accompanying notes to the financial statements and therefore, have been omitted.

(3) Exhibits

Exhibit Number	Description
2.1	Contribution Agreement, dated as of January 25, 1999, among Pactiv Corporation (formerly known as Tenneco Packaging Inc.) (“Pactiv”), PCA Holdings LLC (“PCA Holdings”) and Packaging Corporation of America (“PCA”). (Incorporated herein by reference to Exhibit 2.1 to PCA’s registration Statement on Form S-4, Registration No. 333-79511).
2.2	Letter Agreement Amending the Contribution Agreement, dated as of April 12, 1999, among Pactiv, PCA Holdings and PCA. (Incorporated herein by reference to Exhibit 2.2 to PCA’s Registration Statement on Form S-4, Registration No. 333-79511).
2.3	Agreement and Plan of Merger, dated September 16, 2013, between PCA, Bee Acquisition Corp. and Boise Inc. (Incorporated herein by reference to Exhibit 2.1 to PCA’s Current Report on Form 8-K filed September 17, 2013, File No. 1-15399). PCA will furnish supplementally a copy of any omitted schedule or exhibit to the SEC upon request; provided, however, that PCA may request confidential treatment pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended, for any schedule or exhibit so furnished.
3.1	Restated Certificate of Incorporation of PCA. (Incorporated herein by reference to Exhibit 3.1 to PCA’s Registration Statement on Form S-4, Registration No. 333-79511).
3.2	Certificate of Amendment to Restated Certificate of Incorporation of PCA. (Incorporated herein by reference to Exhibit 3.2 to PCA’s Registration Statement on Form S-4, Registration No. 333-109437.)
3.3	Amended and Restated By-laws of PCA. (Incorporated herein by reference to Exhibit 3.1 to PCA’s Current Report on Form 8-K filed December 13, 2020, File No. 1-15399.)
4.1	Form of certificate representing shares of common stock. (Incorporated herein by reference to Exhibit 4.9 to PCA’s Registration Statement on Form S-1, Registration No. 333-86963.)
4.2	Indenture, dated as of July 21, 2003, between PCA and U.S. Bank National Association. (Incorporated herein by reference to Exhibit 4.2 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2003, File No. 1-15399.)
4.3	First Supplemental Indenture, dated as of July 21, 2003, between PCA and U.S. Bank National Association. (Incorporated herein by reference to Exhibit 4.3 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2003, File No. 1-15399.)
4.4	Officers’ Certificate, dated as of November 21, 2019, pursuant to Section 301 of the Indenture establishing 3.000% Senior Notes due 2029 and 4.050% Senior Notes due 2049. (Incorporated herein by reference to Exhibit 4.1 to PCA’s Current Report on Form 8-K filed November 21, 2019, File No. 1-15399.)
4.5	3.000% Senior Notes due 2029. (Incorporated herein by reference to Exhibit 4.2 to PCA’s Current Report on Form 8-K filed November 21, 2019, File No. 1-15399.)
4.6	4.050% Senior Notes due 2049. (Incorporated herein by reference to Exhibit 4.3 to PCA’s Current Report on Form 8-K filed November 21, 2019, File No. 1-15399.)

83

Exhibit Number	Description
4.7	Officers’ Certificate, dated as of October 22, 2013, pursuant to Section 301 of the Indenture establishing 4.500% Senior Notes due 2023. (Incorporated herein by reference to Exhibit 4.1 to PCA’s Current Report on Form 8-K filed October 22, 2013, File No 1-15399.)
4.8	4.500% Senior Notes due 2023. (Incorporated herein by reference to Exhibit 4.2 to PCA’s Current Report on Form 8-K filed October 22, 2013, File No 1-15399.)
4.9	Officers’ Certificate, dated September 5, 2014, pursuant to Section 301 of the Indenture establishing 3.650% Senior Notes due 2024. (Incorporated herein by reference to Exhibit 4.1 to PCA’s Current Report on Form 8-K filed September 5, 2014, File No. 1-15399).
4.10	3.650% Senior Notes due 2024 (Incorporated herein by reference to Exhibit 4.2 to PCA’s Current Report on Form 8-K filed September 5, 2014, File No. 1-15399).
4.11	Officer’s Certificate, dated December 13, 2017, pursuant to Section 301 of the Indenture establishing 2.450% Senior Notes due 2020 (redeemed and no longer outstanding) and 3.400% Senior Notes due 2027. (Incorporated herein by reference to Exhibit 4.1 to PCA’s Current Report on Form 8-K filed December 13, 2017, File No. 1-15399).
4.12	3.400% Senior Notes due 2027 (Incorporated herein by reference to Exhibit 4.3 to PCA’s Current Report on Form 8-K filed December 13, 2017, File No. 1-15399).
4.13	Description of Common Stock. (Incorporated herein by reference to Exhibit 4.13 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399).
10.1	Amended and Restated Credit Agreement, dated as of August 29, 2016, by and among PCA and the lenders and agents named therein. (Incorporated herein by reference to Exhibit 10.1 to PCA’s Current Report on Form 8-K filed September 1, 2016, File No. 1-15399.)
10.2	Packaging Corporation of America Thrift Plan for Hourly Employees and First Amendment of Packaging Corporation of America Thrift Plan for Hourly Employees, effective February 1, 2000. (Incorporated herein by reference to Exhibit 4.5 to PCA’s Registration Statement on Form S-8, Registration No. 333-33176.)
10.3	Packaging Corporation of America Retirement Savings Plan, effective February 1, 2000. (Incorporated herein by reference to Exhibit 4.6 to PCA’s Registration Statement on Form S-8, Registration No. 333-33176.)*
10.4	Packaging Corporation of America Supplemental Executive Retirement Plan, as Amended and Restated Effective as of February 27, 2019. (Incorporated herein by reference to Exhibit 10.4 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399).*
10.5	Packaging Corporation of America Deferred Compensation Plan, as Amended and Restated Effective as of February 27, 2019. (Incorporated herein by reference to Exhibit 10.5 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399).*
10.6	Amended and Restated 1999 Long-Term Equity Incentive Plan, effective as of May 5, 2020, conformed to incorporate all amendments. (Incorporated herein by reference to Appendix A to PCA's Proxy Statement for the 2020 Annual Meeting of Stockholders)*
10.7	Amended and Restated Executive Incentive Compensation Plan, effective as of December 29, 2017. (Incorporated herein by reference to Exhibit 10.10 to PCA's Annual Report on Form 10-K for the year ended December 31, 2017, File No. 1-15399.)*
10.8	Form of Restricted Stock Agreement for executive officer awards made in June 2017.  (Incorporated by reference to Exhibit 10.1 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2017, File No. 1-15399).*

84

Exhibit Number	Description
10.9	Form of Performance Unit Agreement for executive officer awards made in June 2017.  (Incorporated by reference to Exhibit 10.2 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2017, File No. 1-15399).*
10.10	Performance Based Equity Award Pool for Executive Officers relating to awards made in June 2017.  (Incorporated by reference to Exhibit 10.3 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2017, File No. 1-15399).*
10.11	Trade Vendor Purchasing Agreement, dated December 6, 2019, between Boise White Paper, L.L.C. and Office Depot, Inc. (Incorporated by reference to Exhibit 10.11 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399)**
10.12	Form of Return on Invested Capital Performance Unit Agreement for executive officer awards made in and after June 2018. (Incorporated by reference to Exhibit 10.2 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2018, File No. 1-15399).*
10.13	Form of Total Shareholder Return Performance Unit Agreement for executive officer awards made in and after June 2018. (Incorporated by reference to Exhibit 10.3 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2018, File No. 1-15399).*
10.14	Form of Restricted Stock Agreement for executive officer awards made in and after June 2018. (Incorporated by reference to Exhibit 10.1 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2018, File No. 1-15399).*
21.1	Subsidiaries of the Registrant.†
23.1	Consent of KPMG LLP.†
24.1	Powers of Attorney.†
31.1	Certification of Chief Executive Officer, As Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†
31.2	Certification of Chief Financial Officer, As Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†
32	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. §1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.†
101.INS	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

* Management contract or compensatory plan or arrangement.

** Confidential information in this exhibit has been omitted.

† Filed herewith.

85

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorized on February 24, 2021.

Packaging Corporation of America

/s/    MARK W. KOWLZAN

Mark W. Kowlzan

Chairman of the Board and Chief Executive Officer

Principal Executive Officer

/s/    ROBERT P. MUNDY

Robert P. Mundy

Executive Vice President and Chief Financial Officer

Principal Financial Officer

/s/    PAMELA  A. BARNES

Pamela A. Barnes

Senior Vice President, Finance and Controller

Principal Accounting Officer

86

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below on February 24, 2021, by the following persons on behalf of the registrants and in the capacities indicated.

Signature	Capacity
/s/    MARK W. KOWLZAN
Mark W. Kowlzan	Chairman of the Board and Chief Executive Officer
	(Principal Executive Officer)
/s/    ROBERT P. MUNDY
Robert P. Mundy	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)
/s/    PAMELA  A. BARNES	Senior Vice President, Finance and Controller
Pamela A. Barnes	(Principal Accounting Officer)
*
Cheryl K. Beebe	Director
*
Duane Farrington	Director
*
Donna A. Harman	Director
*
Robert C. Lyons	Director
*
Thomas P. Maurer	Director
*
Samuel M. Mencoff	Director
*
Roger B. Porter	Director
*
Thomas S. Souleles	Director
*
Paul T. Stecko	Director
*
James D. Woodrum	Director
/s/    ROBERT P. MUNDY
Robert P. Mundy
(Attorney-In-Fact)

87

EX-21.1

Exhibit 21.1

Subsidiaries of the Registrant *

	State or Other Jurisdiction of Incorporation or Organization
Packaging Corporation of America (100%)	Delaware
PCA Corrugated and Display, LLC (100%)	Delaware
Polywoven Distributors PA, LLC (51%)	Pennsylvania
PCA International Inc. (100%)	Delaware
PCA International Services, LLC (100%)	Delaware
PCA Hydro Inc. (100%)	Delaware
Packaging Corporation of Asia, Limited (100%)	Hong Kong
PCA Texas Acquisition, LLC (100%)	Delaware
PCA Central California Corrugated, LLC (100%)	Delaware
Hexacomb Corporation (100%)	Illinois
Hexacomb Canada Holdings Corporation (100%)	Canada
Hexacomb Canada Corporation (100%)	Canada
Louisiana Timber Procurement Company, LLC (50%)	Delaware
Boise White Paper, LLC (100%)	Delaware
International Falls Power Company (100%)	Delaware
Minnesota, Dakota & Western Railway Company (100%)	Minnesota
B C T, Incorporated (100%)	Delaware

* The names of some of our foreign subsidiaries have been omitted. These unnamed subsidiaries, considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary, as defined in Regular S-X, Rule 1-02 (w).

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors
Packaging Corporation of America:

We consent to the incorporation by reference in the registration statements (Nos. 333-179620, 333-188265, 333-202723, 333-238155 and 333-238156) on Form S-8 of Packaging Corporation of America of our report dated February 24, 2021, with respect to the consolidated balance sheets of Packaging Corporation of America as of December 31, 2020 and 2019, the related consolidated statements of income and comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes (collectively, the “consolidated financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2020, which report appears in the December 31, 2020 annual report on Form 10‑K of Packaging Corporation of America.

Our report refers to a change in the method of accounting for leases as of January 1, 2019 due to the adoption of Accounting Standards Codification Topic 842, Leases.

/s/ KPMG LLP

Chicago, Illinois
February 24, 2021

EX-24.1

Exhibit 24.1

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ CHERYL K. BEEBE

Cheryl K. Beebe

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ DUANE FARRINGTON

Duane Farrington

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ DONNA  A. HARMAN

Donna A. Harman

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ MARK W. KOWLZAN

Mark W. Kowlzan

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ ROBERT C. LYONS

Robert C. Lyons

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ THOMAS P. MAURER

Thomas P. Maurer

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ SAMUEL M. MENCOFF

Samuel M. Mencoff

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ ROGER B. PORTER

Roger B. Porter

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ THOMAS S. SOULELES

Thomas S. Souleles

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ PAUL T. STECKO

Paul T. Stecko

SPECIAL POWER OF ATTORNEY

The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31, 2020, for filing with the Securities and Exchange Commission by Packaging Corporation of America, a Delaware corporation, together with any and all amendments to such Form 10-K, and to file the same with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or each of them, may lawfully do or cause to be done by virtue hereof.

DATED: February 23, 2021

/s/ JAMES D. WOODRUM

James D. Woodrum

EX-31.1

Exhibit 31.1

CEO CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Mark W. Kowlzan, certify that:

(1) I have reviewed this annual report on Form 10-K of Packaging Corporation of America (PCA);

(2) Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

(3) Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of PCA as of, and for, the periods presented in this annual report;

(4) PCA’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for PCA and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to PCA, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of PCA’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in PCA’s internal control over financial reporting that occurred during PCA’s most recent fiscal quarter (PCA’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, PCA’s internal control over financial reporting; and

(5) PCA’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to PCA’s auditors and the Audit Committee of PCA’s Board of Directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect PCA’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in PCA’s internal control over financial reporting.

/s/    MARK W. KOWLZAN

Mark W. Kowlzan

Chairman of the Board and Chief Executive Officer

Date: February 24, 2021

EX-31.2

Exhibit 31.2

CFO CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Robert P. Mundy, certify that:

(1) I have reviewed this annual report on Form 10-K of Packaging Corporation of America (PCA);

(2) Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

(3) Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of PCA as of, and for, the periods presented in this annual report;

(4) PCA’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for PCA and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to PCA, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of PCA’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in PCA’s internal control over financial reporting that occurred during PCA’s most recent fiscal quarter (PCA’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, PCA’s internal control over financial reporting; and

(5) PCA’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to PCA’s auditors and the Audit Committee of PCA’s Board of Directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect PCA’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in PCA’s internal control over financial reporting.

/s/    ROBERT P. MUNDY

Robert P. Mundy

Executive Vice President and Chief Financial Officer

Date: February 24, 2021

EX-32

Exhibit 32

CERTIFICATIONS OF CHIEF EXECUTIVE OFFICER AND

CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. §1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

We are providing this Certificate pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C., Section 1350. It accompanies the Annual Report on Form 10-K of Packaging Corporation of America for the year ended December 31, 2020.

 _______________________________________

I, Mark W. Kowlzan, Chief Executive Officer of Packaging Corporation of America (the “Company”), certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Annual Report of the Company on Form 10-K for the period ended December 31, 2020 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in such Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    MARK W. KOWLZAN

Mark W. Kowlzan

Chairman of the Board and Chief Executive Officer

Date: February 24, 2021

I, Robert P. Mundy, Chief Financial Officer of Packaging Corporation of America (the “Company”), certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Annual Report of the Company on Form 10-K for the period ended December 31, 2020 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in such Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    ROBERT P. MUNDY

Robert P. Mundy

Executive Vice President and Chief Financial Officer

Date: February 24, 2021

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Trading Symbol	PKG
Entity Registrant Name	PACKAGING CORP OF AMERICA
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, par value $0.01 per share
Entity Interactive Data Current	Yes
Entity File Number	1-15399
Entity Tax Identification Number	36-4277050
Entity Address, Address Line One	1 North Field Court
Entity Address, City or Town	Lake Forest
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60045
City Area Code	847
Local Phone Number	482-3000
Entity Incorporation, State or Country Code	DE
Document Annual Report	true
Document Transition Report	false
Entity Central Index Key	0000075677
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		94,828,214
Entity Public Float			$ 9,321,915,008
Documents Incorporated by Reference	Specified portions of the Proxy Statement for the Registrant's 2021 Annual Meeting of Stockholders are incorporated by reference to the extent indicated in Part III of this Form 10-K.

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Consolidated Statements of Income and Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 6,658,200,000	$ 6,964,300,000	$ 7,014,600,000
Cost of sales	(5,288,800,000)	(5,320,300,000)	(5,369,300,000)
Gross profit	1,369,400,000	1,644,000,000.0	1,645,300,000
Selling and administrative expenses	(539,600,000)	(557,600,000)	(536,400,000)
Goodwill impairment	(55,200,000)
Other expense, net	(50,700,000)	(32,700,000)	(41,200,000)
Income from operations	723,900,000	1,053,700,000	1,067,700,000
Non-operating pension income (expense)	2,300,000	(7,900,000)	(2,100,000)
Interest expense, net	(93,500,000)	(128,800,000)	(95,100,000)
Income before taxes	632,700,000	917,000,000.0	970,500,000
Provision for income taxes	(171,700,000)	(220,600,000)	(232,500,000)
Net income	$ 461,000,000.0	$ 696,400,000	$ 738,000,000.0
Net income per common share:
Basic	$ 4.86	$ 7.36	$ 7.82
Diluted	4.84	7.34	7.80
Dividends declared per common share	$ 3.37	$ 3.16	$ 3.00
Statements of Comprehensive Income:
Net income	$ 461,000,000.0	$ 696,400,000	$ 738,000,000.0
Foreign currency translation adjustment			(100,000)
Reclassification adjustments to cash flow hedges included in net income, net of tax of $0.0 million, $7.9 million, and $1.3 million for 2020, 2019, and 2018, respectively		10,200,000	4,000,000.0
Changes in unrealized gains on marketable debt securities, net of tax of $0.1 million, $0.0 million, and $0.0 million for 2020, 2019, and 2018, respectively	300,000
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $3.6 million, $3.2 million, and $4.0 million for 2020, 2019, and 2018, respectively	10,700,000	9,600,000	11,800,000
Changes in unfunded employee benefit obligations, net of tax of ($1.3) million, $13.6 million, and ($0.8) million for 2020, 2019, and 2018, respectively	4,000,000.0	(40,500,000)	2,400,000
Other comprehensive income (loss)	15,000,000.0	(20,700,000)	18,100,000
Comprehensive income	$ 476,000,000.0	$ 675,700,000	$ 756,100,000

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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Reclassification adjustments to cash flow hedges included in net income, tax	$ (0.0)	$ 7.9	$ 1.3
Changes in unrealized gains on marketable debt securities, tax	0.1	0.0	0.0
Amortization of pension and postretirement plans actuarial loss and prior service cost, tax	3.6	3.2	4.0
Changes in unfunded employee benefit obligations, tax	$ (1.3)	$ 13.6	$ (0.8)

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Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 974.6	$ 679.5
Short-term marketable debt securities	105.6	87.9
Accounts receivable, net of allowance for credit losses and customer deductions of $10.6 million and $12.6 million as of December 31, 2020 and 2019, respectively	832.4	845.6
Inventories	787.9	794.1
Prepaid expenses and other current assets	44.7	44.8
Federal and state income taxes receivable	5.1	26.5
Total current assets	2,750.3	2,478.4
Property, plant and equipment, net	3,193.4	3,151.7
Goodwill	863.5	918.7
Other intangible assets, net	295.9	338.8
Operating lease right-of-use assets	234.2	234.3
Long-term marketable debt securities	42.7	58.1
Other long-term assets	53.2	55.8
Total assets	7,433.2	7,235.8
Current liabilities:
Operating lease obligations	68.9	62.6
Finance lease obligations	1.6	1.5
Accounts payable	387.0	351.9
Dividends payable	97.0	76.6
Accrued liabilities	216.2	217.5
Accrued interest	11.9	13.7
Total current liabilities	782.6	723.8
Long-term liabilities:
Long-term debt	2,479.4	2,476.8
Operating lease obligations	173.6	177.6
Finance lease obligations	14.4	16.0
Deferred income taxes	379.4	340.1
Compensation and benefits	298.3	375.5
Other long-term liabilities	59.2	55.0
Total long-term liabilities	3,404.3	3,441.0
Commitments and contingent liabilities
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 94.8 million and 94.7 million shares issued as of December 31, 2020 and 2019, respectively	0.9	0.9
Additional paid in capital	554.4	524.8
Retained earnings	2,835.5	2,704.8
Accumulated other comprehensive loss	(144.5)	(159.5)
Total stockholders' equity	3,246.3	3,071.0
Total liabilities and stockholders' equity	$ 7,433.2	$ 7,235.8

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Allowance for credit losses and customer deductions	$ 10.6	$ 12.6
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000.0	300,000,000.0
Common stock, shares issued	94,800,000	94,700,000

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Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income		$ 461,000,000.0	$ 696,400,000	$ 738,000,000.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization of intangibles		409,900,000	387,500,000	410,900,000
Amortization of deferred financing costs		2,600,000	23,400,000	8,600,000
Loss on early extinguishment of debt			22,200,000
Share-based compensation expense		30,000,000.0	30,400,000	23,500,000
Deferred income tax provision		34,700,000	60,300,000	38,700,000
Goodwill impairment		55,200,000
Net loss on impairment of assets				3,100,000
Net loss on asset disposals		6,800,000	8,200,000	5,800,000
Pension and post-retirement benefits expense, net of contributions		(63,400,000)	(26,900,000)	3,100,000
Other, net		18,200,000	(3,400,000)	1,300,000
Decrease (increase) in assets —
Accounts receivable		13,200,000	56,400,000	(56,100,000)
Inventories		6,300,000	1,400,000	(35,600,000)
Prepaid expenses and other current assets		400,000	(6,900,000)	(2,100,000)
Increase (decrease) in liabilities —
Accounts payable		39,700,000	(32,400,000)	(17,600,000)
Accrued liabilities		(3,200,000)	(100,000)	5,500,000
Federal and state income tax payable / receivable		21,400,000	(9,100,000)	53,000,000.0
Net cash provided by operating activities		1,032,800,000	1,207,400,000	1,180,100,000
Cash Flows from Investing Activities:
Additions to property, plant, and equipment	[1]	(421,200,000)	(399,500,000)	(551,400,000)
Acquisitions of businesses, net of cash acquired				(56,300,000)
Additions to other long-term assets		(6,400,000)	(3,800,000)	(4,500,000)
Proceeds from asset disposals		4,600,000	4,100,000	1,500,000
Purchases of marketable debt securities		(110,100,000)	(157,000,000.0)
Proceeds from sales of marketable debt securities		24,200,000	10,900,000
Proceeds from maturities of marketable debt securities		82,800,000
Other, net			(1,300,000)	2,500,000
Net cash used for investing activities		(426,100,000)	(546,600,000)	(608,200,000)
Cash Flows from Financing Activities:
Proceeds from issuance of debt			895,800,000
Repayments of debt and finance lease obligations		(1,500,000)	(923,400,000)	(151,300,000)
Financing costs paid			(8,300,000)
Common stock dividends paid		(299,600,000)	(298,700,000)	(268,100,000)
Shares withheld to cover employee restricted stock taxes		(10,500,000)	(8,200,000)	(7,900,000)
Net cash used for financing activities		(311,600,000)	(342,800,000)	(427,300,000)
Net increase in cash and cash equivalents		295,100,000	318,000,000.0	144,600,000
Cash and cash equivalents, beginning of year		679,500,000	361,500,000	216,900,000
Cash and cash equivalents, end of year		$ 974,600,000	$ 679,500,000	$ 361,500,000

[1] Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisitions of businesses, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment	Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Common Stock	Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Additional Paid in Capital	Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Retained Earnings	Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2017	$ 2,182.6	$ 0.9	$ 471.2	$ 1,867.4	$ (156.9)
Beginning Balance (in shares) at Dec. 31, 2017		94,350
Common stock withheld and retired to cover taxes on vested stock awards	(7.9)	$ 0.0	(0.5)	(7.4)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(69)
Common stock dividends declared	(284.0)	$ 0.0	0.0	(284.0)	0.0
Share-based compensation expense	23.5	$ 0.0	23.5	0.0	0.0
Share-based compensation expense (in shares)		216
Other	0.5	$ 0.0	0.3	0.2	0.0
Comprehensive income	756.1	0.0	0.0	738.0	18.1
Ending Balance at Dec. 31, 2018	2,672.4	$ 0.9	494.5	2,315.8	(138.8)
Ending Balance (in shares) at Dec. 31, 2018		94,497
Retained earnings | ASU 2014-09						$ 1.6	$ 0.0	$ 0.0	$ 1.6	$ 0.0
Common stock withheld and retired to cover taxes on vested stock awards	(8.2)	$ 0.0	(0.7)	(7.5)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(87)
Common stock dividends declared	(299.7)	$ 0.0	0.0	(299.7)	0.0
Share-based compensation expense	31.0	$ 0.0	31.0	0.0	0.0
Share-based compensation expense (in shares)		245
Other	(0.2)	$ 0.0	0.0	(0.2)	0.0
Comprehensive income	675.7	0.0	0.0	696.4	(20.7)
Ending Balance at Dec. 31, 2019	3,071.0	$ 0.9	524.8	2,704.8	(159.5)
Ending Balance (in shares) at Dec. 31, 2019		94,655
Retained earnings	2,704.8
Common stock withheld and retired to cover taxes on vested stock awards	(10.5)	$ 0.0	(0.8)	(9.7)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(108)
Common stock dividends declared	(320.9)	$ 0.0	0.0	(320.9)	0.0
Share-based compensation expense	30.8	$ 0.0	30.8	0.0	0.0
Share-based compensation expense (in shares)		283
Other	(0.1)	$ 0.0	(0.4)	0.3	0.0
Comprehensive income	476.0	0.0	0.0	461.0	15.0
Ending Balance at Dec. 31, 2020	3,246.3	$ 0.9	$ 554.4	$ 2,835.5	$ (144.5)
Ending Balance (in shares) at Dec. 31, 2020		94,830
Retained earnings	$ 2,835.5

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Nature of Operations and Basis of Presentation

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Operations and Basis of Presentation

1. 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 have approximately 15,200 employees.

We report our business in three reportable segments: Packaging, Paper, and Corporate and Other. Our Packaging segment produces a wide variety of containerboard and corrugated packaging products. The Paper segment manufactures and sells a range of communication-based papers.

During the fourth quarter of 2020, due to an increase in demand for our corrugated products and as part of our assessment of a potential conversion to produce containerboard, we began producing high-performance, virgin kraft linerboard on the No. 3 machine at our Jackson, Alabama mill on a trial basis. Before October 2020, operating results for the Jackson mill were included in the Paper segment. Beginning in October 2020, operating results for the Jackson mill are included in both the Packaging and Paper segments.

During the second quarter of 2018, the Company discontinued the production of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill and converted the No. 3 machine at the mill from production of white papers to production of virgin kraft linerboard. Before May 2018, operating results for the Wallula mill were included in the Paper segment. After May 2018, operating results for the Wallula mill are primarily included in the Packaging segment.

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 19, Segment Information.

In these consolidated financial statements, certain amounts in prior periods’ consolidated financial statements have been reclassified to conform with the current period presentation.

The consolidated financial statements include the accounts of PCA and its majority-owned subsidiaries after elimination of intercompany balances and transactions.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. We adjust such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates will be reflected in the consolidated financial statements in future periods.

Revenue Recognition

In accordance with ASU 2014-09 (Topic 606): Revenue from Contracts with Customers, we recognize revenue when control of the promised goods or services is transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. The timing of revenue recognition for most goods and services occurs when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. For most packaging and paper products, revenue is recognized when the product is shipped from the mill or from our manufacturing facility to our customer. Shipping and handling fees billed to a customer are recorded on a gross basis in “Net sales”, with the corresponding shipping and handling costs included in “Cost of sales” in the concurrent period as the revenue is recorded. We present taxes collected from customers and remitted to governmental authorities on a net basis in our Consolidated Statements of Income. See Note 4, Revenue, for more information.

Planned Major Maintenance Costs

The Company accounts for its planned major maintenance activities in accordance with ASC 360, Property, Plant, and Equipment, using the deferral method. All maintenance costs incurred during the year are expensed in the year in which the maintenance activity occurs.

Share-Based Compensation

We recognize compensation expense for awards granted under the PCA long-term equity incentive plans based on the fair value on the grant date. We recognize the cost of the equity awards expected to vest over the period the awards vest. See Note 14, Share-Based Compensation, for more information.

Research and Development

Research and development costs are expensed as incurred. The amount charged to expense was $15.5 million, $16.0 million, and $14.4 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Cash and Cash Equivalents

Cash and cash equivalents include all cash balances and highly liquid investments with original maturities of three months or less at the date of purchase. Cash equivalents are stated at cost, which approximates market. Cash and cash equivalents totaled $974.6 million and $679.5 million at December 31, 2020 and 2019, respectively, which included cash equivalents of $662.2 million and $410.7 million, respectively. At December 31, 2020 and 2019, we had $2.2 million and $2.4 million, respectively, of cash at our operations outside the United States.

Marketable Debt Securities

The Company’s marketable debt securities have been classified and accounted for as available-for-sale (AFS) marketable debt securities in accordance with ASU 2016-13, Financial Instruments – Credit Losses (Topic 326). The Company reports its marketable debt securities at fair value, and they are classified as short-term or long-term based on each security’s underlying contractual maturity date.

The Company’s marketable debt securities are analyzed at the individual debt security level. Changes in the fair value of the debt security have the potential to impact accumulated other comprehensive income (loss) (AOCI), the Company’s earnings, or both.

The Company regularly reviews its investment portfolio to determine if any debt security is impaired. A decline in the fair value of the debt security below its amortized cost results in an impairment of the debt security. If there is an intent to sell the debt security, or if it is more likely than not that the debt security will be sold prior to recovering the amortized cost basis, the Company recognizes the impairment as a realized loss in earnings by writing down the debt security’s amortized cost basis.

Additional analysis is required if there is not an intent to sell the debt security, or if a recovery of the amortized cost basis is expected to be made prior to the sale of the security. If any portion of the impairment is the result of a credit loss, the Company recognizes this portion in earnings through an allowance for credit losses, with the remainder recognized as unrealized loss in AOCI. Subsequent improvements in credit losses are recognized as a reduction in the allowance. Any impairment not attributed to credit loss is recognized as an unrealized loss in AOCI in its entirety.

The Company considers several factors when determining if a portion of an impairment is the result of a credit loss including, but not limited to, adverse conditions related to the financial health and future outlook of the issuer; the credit quality of the issuer, as reported by credit rating agencies; trends present in the issuer’s industry in which it operates; and general market conditions.

For the year ended December 31, 2020, we do not consider any of the impairments related to our marketable debt securities to be the result of credit losses. We recorded no other-than-temporary impairment charges on our AFS securities for the year ended December 31, 2019 under prior year guidance ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 11, Cash, Cash Equivalents, and Marketable Debt Securities, for more information.

Trade Accounts Receivable, Allowances, and Customer Deductions

Trade accounts receivable are recorded at amortized cost and represent a contractual right to receive payment from a customer. The Company’s trade accounts receivable are short-term receivables, with most requiring payment within 30 to 60 days, and represent the only class of financing receivables utilized by the Company. As of December 31, 2020, we do not expect the effect of the COVID-19 pandemic to have a material impact on our ability to collect on our outstanding trade accounts receivable.

In accordance with ASU 2016-13, Financial Instruments – Credit Losses (Topic 326), the Company established an allowance for credit losses, which is a valuation account that estimates the expected credit loss over the lifetime of the asset and is deducted from, or added to, the amortized cost basis of the trade accounts receivable. The allowance for credit losses is based upon a combination of factors such as historical collection experience, aged receivables, current economic conditions, and reasonable and supportable forecasts on future economic conditions. Expected recoveries of amounts previously written off, not to exceed the aggregate of the amount previously written off, are also considered when determining the necessary allowance at the balance sheet date. When determining the allowance for credit losses, management also considers specific customer accounts that may be considered higher risk or uncollectible due to customer industry trends, bankruptcy filings, or substantial downgrades of credit scores.

Current period estimates for the allowance for credit losses are compared against the allowance previously recorded, and all required adjustments are reported as credit loss expense (for expected losses or write offs) or a reversal of credit loss expense (for expected recoveries) in net income. Outstanding trade accounts receivable balances are written off when deemed uncollectible after undergoing reasonable collection efforts. At December 31, 2020, the allowance for credit losses was $3.0 million, and at December 31, 2019, the allowance for doubtful accounts was $4.2 million.

The customer deductions reserve represents the estimated amount required for customer returns, allowances, and earned discounts. Based on the Company’s experience, customer returns, allowances, and earned discounts have averaged approximately 1% of gross selling price. Accordingly, PCA reserves 1% of its open customer accounts receivable balance for these items. The reserves for customer deductions of $7.6 million and $8.4 million at December 31, 2020 and 2019, respectively, are also included as a reduction of the accounts receivable balance.

Derivative Instruments and Hedging Activities

The Company records its derivatives, if any, in accordance with ASC 815, Derivatives and Hedging. The guidance requires the Company to recognize derivative instruments as either assets or liabilities on the balance sheet at fair value. The accounting for changes in the fair value of a derivative depends on the intended use and designation of the derivative instrument. For a derivative designated as a fair value hedge, the gain or loss on the derivative is recognized in earnings in the period of change at fair value together with the offsetting gain or loss on the hedged item. For a derivative instrument designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially reported as a component of AOCI and is subsequently recognized in earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is recognized in earnings. We were not party to any derivative-based arrangements at December 31, 2020 and 2019.

Fair Value Measurements

PCA measures the fair value of its financial instruments and marketable debt securities in accordance with ASC 820, Fair Value Measurements and Disclosures. The guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. It is determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes the following hierarchy that prioritizes the inputs to valuation methodologies used to measure fair value:

Level 1 — Valuations based on quoted prices for identical assets and liabilities in active markets.

Level 2 — Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

Level 3 — Valuations based on unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets that are measured at fair value using the net asset value (NAV) per share as a practical expedient are not categorized within the fair value hierarchy.

Financial instruments and marketable debt securities measured at fair value on a recurring basis include the fair values of our marketable debt securities and our pension and postretirement benefit assets and liabilities. The valuation techniques used to measure the fair value of the Company’s marketable debt securities and pension and postretirement benefit assets and liabilities, which generally have counterparties with high credit ratings, are based on quoted market prices or model-driven valuations using significant inputs derived from or corroborated by observable market data. See Note 11, Cash, Cash Equivalents, and Marketable Debt Securities, and Note 12, Employee Benefit Plans and Other Postretirement Benefits, for more information.

Other assets and liabilities measured and recognized at fair value on a nonrecurring basis include assets acquired and liabilities assumed in acquisitions and our asset retirement obligations. Given the nature of these assets and liabilities, evaluating their fair value from the perspective of a market participant is inherently complex. Assumptions and estimates about future values can be affected by a variety of internal and external factors. Changes in these factors may require us to revise our estimates and could require us to retroactively adjust provisional amounts that we recorded for the fair values of assets acquired and liabilities assumed in connection with business combinations. These adjustments could have a material effect on our financial condition and results of operations. See Note 13, Asset Retirement Obligations, for more information.

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.

The components of inventories were as follows (dollars in millions):

	December 31,
	2020		2019
Raw materials	$	263.5	$	271.5
Work in process		11.6		11.0
Finished goods		183.6		207.7
Supplies and materials		329.2		303.9
Inventories	$	787.9	$	794.1

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost. Cost includes expenditures for major improvements and replacements and the amount of interest cost associated with significant capital additions. Repairs and maintenance costs are expensed as incurred. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in “Net income” in our Consolidated Statements of Income.

Property, plant, and equipment consisted of the following (dollars in millions):

	December 31,
	2020			2019
Land and land improvements	$	179.6		$	177.5
Buildings		858.5			837.4
Machinery and equipment		5,826.6			5,727.4
Construction in progress		360.0			174.0
Other		88.8			81.5
Property, plant and equipment, at cost		7,313.5			6,997.8
Less accumulated depreciation		(4,120.1	)		(3,846.1	)
Property, plant and equipment, net	$	3,193.4		$	3,151.7

The amount of interest capitalized from construction in progress was $3.7 million, $3.4 million, and $4.5 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Depreciation is computed on the straight-line basis over the estimated useful lives of the related assets. Assets under finance leases are depreciated on the straight-line method over the term of the lease or the useful life, if shorter. The following lives are used for the various categories of assets:

Buildings and land improvements	5 to 40 years
Machinery and equipment	3 to 25 years
Trucks and automobiles	3 to 10 years
Furniture and fixtures	3 to 20 years
Computers and hardware	3 to 10 years
Leasehold improvements	Period of the lease or useful life, if shorter

The amount of depreciation expense was $362.5 million, $346.8 million, and $361.7 million for the years ended December 31, 2020, 2019, and 2018, respectively. In 2020, 2019, and 2018, we recognized incremental depreciation expense of $4.5 million, $0.3 million, and $14.5 million, respectively. The incremental depreciation expense for 2020 related to closures of corrugated products facilities, while the incremental depreciation expense for 2019 and 2018 primarily related to the second quarter 2018 discontinuation of paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

Pursuant to the terms of an industrial revenue bond, title to certain property, plant, and equipment was transferred to a municipal development authority in 2009 in order to receive a property tax abatement. The title of these assets will revert back to PCA upon retirement or cancellation of the bond. The assets are included in the consolidated balance sheets under the caption “Property, plant, and equipment, net”, as all risks and rewards remain with the Company.

Leases

We determine if an arrangement is, or contains, a lease at the inception date based on the presence of identified assets and our right to obtain substantially all of the economic benefit from or to direct the use of such assets. When we determine a lease exists, we record a right-of-use asset and corresponding lease liability on our consolidated balance sheets. Right-of-use assets represent our right to use an underlying asset for the lease term. Lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets are recognized at commencement date at the value of the lease liability and are adjusted for any prepayments, lease incentives received, and initial direct costs incurred. Lease liabilities are recognized at lease commencement date based on the present value of remaining lease payments over the lease term. As the discount rate implicit in the lease is not readily determinable in most of our leases, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

Operating lease balances are included in Operating lease right-of-use assets with the related liabilities included in Current Operating lease obligations and Long-term Operating lease obligations. Assets under finance leases are included in Property, plant and equipment, net, with the related liabilities included in Current Finance lease obligations and Long-term Finance lease obligations.

We do not record lease contracts with a term of 12 months or less on our consolidated balance sheets.

We recognize fixed lease expense for operating leases on a straight-line basis over the lease term. For finance leases, we recognize amortization expense on the right-of-use asset and interest expense on the lease liability over the lease term.

We have lease agreements with non-lease components that relate to lease components (e.g., common area maintenance such as cleaning or landscaping, insurance, etc.). We account for each lease and any non-lease components associated with that lease as a single lease component for all underlying asset classes. Accordingly, all costs associated with a lease contract are accounted for as lease costs.

Long-Lived Asset Impairment

Long-lived assets other than goodwill and other intangibles are reviewed for impairment in accordance with provisions of ASC 360, Property, Plant and Equipment. In the event that facts and circumstances indicate that the carrying amount of any long-lived assets may be impaired, an evaluation of recoverability is performed. If an evaluation is required, the estimated

future undiscounted cash flows associated with the asset (or group of assets) is compared to the assets (or group of assets) carrying amount to determine if a write-down to fair value is required.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of our long-lived assets within our Paper reporting unit, including property, plant, and equipment, and performed a recoverability test on the Paper reporting unit long-lived assets as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long-lived assets within our Paper segment, inclusive of property, plant, and equipment, were 100% recoverable.

Goodwill and Intangible Assets

The Company has capitalized certain intangible assets, primarily goodwill, customer relationships, and trademarks and trade names, based on their estimated fair value at the date of acquisition. Amortization is provided for customer relationships on a straight-line basis over periods ranging from ten to 40 years, and trademarks and trade names over periods ranging from five to 20 years.

Goodwill, which amounted to $863.5 million and $918.7 million for the years ended December 31, 2020 and 2019, respectively, is not amortized but is subject to an annual impairment test in accordance with ASC 350, Intangibles – Goodwill and Other. We test goodwill for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. Additionally, we evaluate the remaining useful lives of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives are necessary.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit and performed an interim quantitative impairment analysis as of May 31, 2020. Based on the evaluation performed, we determined that the carrying value of the Paper reporting unit exceeded its fair value, which resulted in a goodwill impairment charge totaling $55.2 million.

The Company concluded that none of the goodwill or intangible assets were impaired in the 2020, 2019, and 2018 annual impairment tests. See Note 8, Goodwill and Intangible Assets, for additional information.

Pension and Postretirement Benefits

Several estimates and assumptions are required to record pension costs and liabilities, including discount rate, return on assets, and longevity and service lives of employees. We review and update these assumptions annually unless a plan curtailment or other event occurs, requiring that we update the estimates on an interim basis. While we believe the assumptions used to measure our pension and postretirement benefit obligations are reasonable, differences in actual experience or changes in assumptions may materially affect our pension and postretirement benefit obligations and future expense. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

For postretirement health care plan accounting, the Company reviews external data and its own historical trends for health care costs to determine the health care cost trend rate assumption.  

Environmental Matters

Environmental expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities are recorded for environmental contingencies when such costs are probable and reasonably estimable. These liabilities are adjusted as further information develops or circumstances change. Environmental expenditures related to existing conditions resulting from past or current operations from which no current or future benefit is discernible are expensed as incurred.

Asset Retirement Obligations

The Company accounts for its retirement obligations related predominantly to landfill closure, wastewater treatment pond dredging, closed-site monitoring costs, and certain leasehold improvements under ASC 410, Asset Retirement and Environmental Obligations, which requires recognition of legal obligations associated with the retirement of long-lived assets whether these assets are owned or leased. These legal obligations are recognized at fair value at the time that the obligations are

incurred. When we record the liability, we capitalize the cost by increasing the carrying amount of the related long-lived asset, which is amortized to expense over the useful life of the asset. See Note 13, Asset Retirement Obligations, for additional information.

Deferred Debt Issuance Costs

PCA has capitalized certain costs related to obtaining its financing. These costs are amortized to interest expense using the effective interest rate method over the terms of the related financing, which range from 10 to 30 years. At December 31, 2020 and 2019, deferred debt issuance costs were $14.3 million and $16.3 million, respectively, and were recorded in “Long-Term Debt” on our Consolidated Balance Sheets.

Cutting Rights and Fiber Farms

We lease the cutting rights to approximately 71,000 acres of timberland. For our cutting rights, we capitalize the annual lease payments and reforestation costs associated with these leases. Costs are recorded as depletion when the timber or fiber is harvested and used in operations or sold to customers. Capitalized long-term lease costs for our cutting rights, primarily recorded in “Other long-term assets” on our Consolidated Balance Sheets, were $20.3 million and $21.6 million as of December 31, 2020 and 2019, respectively. The amount of depletion expense was $3.1 million, $2.7 million, and $7.6 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Deferred Software Costs

PCA capitalizes costs related to the purchase and development of software, which is used in its business operations. The costs attributable to these software systems are amortized over their estimated useful lives based on various factors such as the effects of obsolescence, technology, and other economic factors. Net capitalized software costs recorded in “Other long-term assets” on our Consolidated Balance Sheets were $4.8 million and $1.4 million for the years ended December 31, 2020 and 2019, respectively. Software amortization expense was $1.1 million, $0.9 million, and $2.1 million for the years ended December 31, 2020, 2019, and 2018, respectively.

During 2019, the Company early adopted ASU 2018-15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which includes amendments to align the accounting for costs incurred to implement a cloud computing arrangement that is a service contract with the guidance on capitalizing costs associated with developing or obtaining internal-use software. As of December 31, 2020, capitalized costs associated with cloud computing arrangements were $4.0 million. These costs were immaterial as of December 31, 2019.

Income Taxes

PCA utilizes the liability method of accounting for income taxes whereby it recognizes deferred tax assets and liabilities for the future tax consequences of temporary differences between the tax basis of assets and liabilities and the reported amounts in the financial statements. Deferred tax assets will be reduced by a valuation allowance if, based upon management’s estimates, it is more likely than not that a portion of the deferred tax assets will not be realized in a future period. The estimates utilized in the recognition of deferred tax assets are subject to revision in future periods based on new facts or circumstances. PCA’s practice is to recognize interest and penalties related to unrecognized tax benefits in income tax expense.

Trade Agreements

PCA regularly trades containerboard with other manufacturers primarily to reduce shipping costs. These agreements are entered into with other producers on an annual basis, pursuant to which both parties agree to ship an identical number of tons of containerboard to each other within the agreement period. These agreements lower transportation costs by allowing each party’s containerboard mills to ship containerboard to the other party’s closer corrugated products plant. PCA tracks each shipment to ensure that the other party’s shipments to PCA match PCA’s shipments to the other party during the agreement period. Such transfers are possible because certain grades of containerboard are commodity products with no distinguishing product characteristics. These transactions are accounted for at carrying value, and revenue is not recorded as the transactions do not represent the culmination of an earnings process. The transactions are recorded into inventory accounts, and no sale or income is recorded until such inventory is converted to a finished product and sold to an end-use customer.

Business Combinations

The Company accounts for acquisitions under ASC 805, Business Combinations and ASU 2017-01 (Topic 805): Clarifying the Definition of a Business. ASC 805 requires separate recognition of assets acquired and liabilities assumed from goodwill at the acquisition date fair values. ASU 2017-01 (Topic 805) provides additional guidance to assist entities with evaluating whether transfers of assets and activities should be accounted for as acquisitions of assets or businesses. Goodwill as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date fair values of the assets acquired and liabilities assumed. During the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated financial statements.

Recently Adopted Accounting Standards

Effective January 1, 2020, we adopted Accounting Standards Update (“ASU”) 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 introduces the Current Expected Credit Losses (“CECL”) framework for evaluating credit losses on financial instruments measured at amortized cost. ASU 2016-13 was applied using the modified retrospective method, and as a result, amounts recorded prior to January 1, 2020 have not been retrospectively restated. This new framework requires entities to incorporate forward-looking information into their estimate of current expected credit loss as of each reporting date. Although available-for-sale (“AFS”) debt securities are not within the scope of the new CECL framework, the ASU includes an amended impairment model for evaluating losses related to AFS debt securities. The guidance in this update also includes enhanced requirements for disclosures related to credit loss estimates.

Prior to adoption of the new standard, the Company already incorporated forward-looking information into its estimate of credit losses for trade receivables. Due to the short duration of the Company’s trade receivables, the adoption of ASU 2016-13 did not have a material impact on trade receivables. The adoption of ASU 2016-13 also did not have a material impact on the Company’s AFS marketable debt securities, as the Company only invests in highly-rated AFS marketable debt securities. Overall, the adoption of ASU 2016-13 did not have a material impact on the Company’s financial condition, results of operations or cash flow.

Effective January 1, 2020, the Company adopted ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 removes or modifies certain disclosure requirements and adds additional requirements to improve the usefulness of the fair value measurement disclosure for financial statement users. Certain new requirements of ASU 2018-13 are required to be applied prospectively for the first interim period of the initial year of adoption. However, the modifications and removal of certain information needs to be applied retrospectively. The adoption of this Update did not have a significant impact on the Company’s related disclosures as reflected in this Annual Report on Form 10-K.

Effective for the annual period ended December 31, 2020, the Company adopted ASU 2018-14, Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans. ASU 2018-14 removes certain disclosures that are not considered cost beneficial, clarifies certain required disclosures, and adds additional disclosures. The amendments in this ASU were applied retrospectively in this Annual Report on Form 10-K and did not have a significant impact on the disclosures for our defined pension benefit plans and other postretirement benefits.

Effective January 1, 2019, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02 (Topic 842): Leases, which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The original guidance required application on a modified retrospective basis with the earliest period presented. In July 2018, the FASB issued ASU 2018-11, Targeted Improvements to ASC 842, which included an option to not restate comparative periods in transition and elect to use the effective date of ASC 842, Leases, as the date of initial application of transition, which we elected. As a result of the adoption of ASC 842 on January 1, 2019, we recorded operating lease liabilities of $228 million, with corresponding right-of-use assets of the same amount. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed us to carry forward the historical lease classification and not to reassess whether existing or expired contracts contain a lease. We also elected the short-term lease recognition exemption, which permits us to exclude short-term leases (i.e. leases with terms of 12 months or less) from the recognition requirements of this standard, and we elected to account for lease and non-lease components as a single lease component for all classes of underlying assets except for embedded leases. The adoption of ASC 842 had an immaterial impact on our consolidated net earnings, liquidity and debt covenants under our current agreements for the year ended December 31, 2019. See Note 3, Leases, for more information.

New Accounting Standards Not Yet Adopted

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting. The amendments in this Update are elective and apply to all entities, subject to meeting certain criteria, that have contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Companies can apply the ASU immediately, but the guidance will only be available until December 31, 2022. The Company is currently evaluating the impact of this guidance, but does not expect the guidance to have a significant impact on its related disclosures.

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.

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Leases

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Leases

3.Leases

We group our leases into two primary lease types, real estate and equipment, and into various asset classes within each type. Real estate leases primarily include manufacturing locations, office space, warehouses, and design centers, while equipment leases primarily include manufacturing equipment.

Leases with an initial term of 12 months or less and certain month-to-month leases are not recorded on the balance sheet. The lease expense for these types of leases is recognized on a straight-line basis over the lease term.

To determine the lease term, we include the non-cancellable period of the lease together with the following: all periods covered by an option to extend the lease if we are reasonably certain to exercise that option; any periods covered by an option to terminate the lease if we are reasonably certain not to exercise that option; and any periods covered by an option to extend or not to terminate the lease that are controlled by the lessor. The exercising of lease renewal options is based on whether future economic benefit is expected to be derived from the renewal. Most of our real estate leases contain at least one renewal option. Renewal options generally range from 1 to 5 years. Although equipment leases may also contain renewal options, we typically do not expect to extend and/or exercise these renewal options unless a compelling business reason is provided to management.

Our leases may contain fixed and variable costs. Fixed costs determine the right-of-use asset. Variable costs are those costs which will vary month to month and are excluded from the calculation of the right-of-use asset. Variable lease costs are recorded to lease expense in the period in which they are incurred.

Our leases do not provide an implicit borrowing rate of return. Therefore, we use our incremental borrowing rate to calculate the present value of lease payments at inception of the lease or when a lease is modified.

Supplemental balance sheet information related to our operating leases was as follows (dollars in millions):

	Year Ended December 31,
	2020		2019
Operating lease right-of-use assets	$	234.2	$	234.3
Current portion of operating lease obligations	$	68.9	$	62.6
Long-term portion of operating lease obligations		173.6		177.6
Total operating lease obligations	$	242.5	$	240.2

Supplemental balance sheet information related to our finance leases was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019
Buildings	$	0.3		$	0.3
Machinery and equipment		28.5			28.5
Total		28.8			28.8
Less accumulated amortization		(19.6	)		(18.1	)
Total	$	9.2		$	10.7
Current portion of finance lease obligations	$	1.6		$	1.5
Long-term portion of finance lease obligations		14.4			16.0
Total finance lease obligations	$	16.0		$	17.5

The Company was obligated under finance leases covering buildings and machinery and equipment in the amount of $16.0 million and $17.5 million at December 31, 2020 and 2019, respectively. Amortization of assets under finance lease obligations is included in depreciation expense.

For both operating and finance leases, the weighted average remaining lease term in years and weighted average discount rates were as follows:

	Year Ended December 31,
	2020		2019
Weighted-average remaining lease term (years):
Operating leases		5.3		5.6
Finance leases		7.8		8.8
Weighted-average discount rate:
Operating leases	3.79%		4.23%
Finance leases	6.66%		6.66%

The components of lease expense were as follows (dollars in millions):

	Year Ended December 31,
	2020		2019
Finance lease cost:
Amortization of finance lease assets	$	1.5	$	1.5
Interest on lease liabilities		1.1		1.2
Total finance lease cost		2.6		2.7
Operating lease cost		74.4		70.2
Short-term lease cost		18.0		19.2
Variable lease cost		12.9		13.7
Total lease cost	$	107.9	$	105.8

Total lease expense, including base rent on all leases and executory costs, such as insurance, taxes, and maintenance, for the year ended December 31, 2018 was $115.1 million. These costs are included in “Cost of sales” and “Selling, general, and administrative expenses” in our Consolidated Statements of Income. We had an insignificant amount of sublease rental income for the years ended December 31, 2020 and 2019 and no sublease rental income for the year ended December 31, 2018.

Interest expense related to finance lease obligations for the year ended December 31, 2018 was $1.3 million.

Supplemental cash flow information related to leases was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	(68.2	)	$	(60.0	)
Operating cash flows for finance leases		(1.5	)		(1.5	)
Financing cash flows for finance leases		(1.1	)		(1.2	)
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	$	(35.7	)	$	(27.7	)
Finance leases		—			—
Supplemental non-cash information on changes in lease liabilities	$	34.8		$	44.5
Supplemental non-cash information on changes in right-of-use assets	$	35.8		$	21.4

The future minimum payments under operating and finance lease liabilities at December 31, 2020 were as follows (dollars in millions):

	Operating Leases			Finance Leases
2021	$	76.7		$	2.7
2022		58.9			2.7
2023		42.3			2.7
2024		30.3			2.7
2025		21.1			2.7
Thereafter		40.4			7.0
Total lease payments		269.7			20.5
Less imputed interest (a)		(27.2	)		(4.5	)
Present value of lease liabilities	$	242.5		$	16.0

(a) Calculated using the incremental borrowing rate for each lease applied to the future payments.

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Revenue

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

Revenue

4. Revenue

Revenue Recognition

Revenue is recognized when control of the promised goods or services is transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. Sales, value added, and other taxes collected concurrently with revenue-producing activities are excluded from revenue.

The following table presents our revenues disaggregated by product line (dollars in millions):

	Year Ended December 31,
	2020		2019		2018
Packaging	$	5,919.5	$	5,932.2	$	5,938.5
Paper		674.8		964.3		1,002.0
Corporate and Other		63.9		67.8		74.1
Total revenue	$	6,658.2	$	6,964.3	$	7,014.6

Packaging Revenue

Our containerboard mills produce linerboard and corrugating medium which are papers primarily used in the production of corrugated products. The majority of our containerboard production is used internally by our corrugated products manufacturing facilities. The remaining containerboard is sold to outside domestic and export customers. Our corrugated products manufacturing plants produce a wide variety of corrugated packaging products and retail merchandise displays. We sell corrugated products to national, regional and local accounts, which are broadly diversified across industries and geographic locations.

The Company recognizes revenue for its packaging products when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. Based on our

express terms and conditions of the sale of products to our customers, as well as terms included in contractual arrangements with our customers, we do not have an enforceable right of payment that includes a reasonable profit throughout the duration of the contract for products that do not have an alternative use. Revenue is recognized when the product is shipped from the mill or from our manufacturing facility to our customer. Certain customers may receive volume-based incentives, which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized.

Certain customers receive a portion of their packaging products as consigned inventory with billing triggered once the customer uses or consumes the designated product. Prior to invoicing, these amounts are handled as unbilled receivables. Total unbilled receivables, which are immaterial in amount, are included in the accounts receivable financial statement caption.

Paper Revenue

We manufacture and sell a range of communication-based papers. Communication papers consist of cut-size office papers, and printing and converting papers.

The Company recognizes revenue for its paper products when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. Revenue is recognized when the product is shipped from the mill or from our manufacturing facility or distribution center to our customer. Certain customers may receive volume-based incentives, which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized.

Corporate and Other Revenue

Revenue in this segment primarily relates to Louisiana Timber Procurement Company, L.L.C. (LTP), a variable-interest entity that is 50% owned by PCA and 50% owned by Boise Cascade Company (Boise Cascade). 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. See Note 18, Transactions With Related Parties, for more information related to LTP.

The Company recognizes revenue within this segment when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time.

Practical Expedients and Exemption

Shipping and handling fees billed to a customer are recorded on a gross basis in "Net sales" with the corresponding shipping and handling costs included in "Cost of sales" in the concurrent period as the revenue is recorded. We expense sales commissions when incurred because the amortization period is one year or less. Sales commissions are recorded in "Selling, general, and administrative expenses".

We do not disclose the value of unsatisfied performance obligations for contracts with an original expected duration of one year or less.

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Earnings Per Share

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share

5. 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).

	Year Ended December 31,
		2020			2019			2018
Numerator:
Net income	$	461.0		$	696.4		$	738.0
Less: distributed and undistributed earnings allocated    to participating securities		(3.6	)		(5.2	)		(5.7	)
Net income attributable to common stockholders	$	457.4		$	691.2		$	732.3
Denominator:
Weighted average common shares outstanding		94.1			93.8			93.7
Effect of dilutive securities		0.3			0.3			0.2
Diluted common shares outstanding		94.4			94.1			93.9
Basic income per common share	$	4.86		$	7.36		$	7.82
Diluted income per common share	$	4.84		$	7.34		$	7.80

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Other Expense, Net

12 Months Ended

Dec. 31, 2020

Other Income And Expenses [Abstract]

Other Expense, Net

6. Other Expense, Net

The components of other expense, net, were as follows (dollars in millions):

	Year Ended December 31,
	2020			2019			2018
Asset disposals and write-offs (a)	$	(26.5	)	$	(25.0	)	$	(17.3	)
Facilities closure and other costs (b)		(19.1	)		(0.3	)		(1.6	)
Wallula mill restructuring (c)		—			(0.7	)		(14.9	)
Insurance deductible for property damage (d)		—			—			(0.5	)
Acquisition and integration related costs (e)		—			—			(0.2	)
Other		(5.1	)		(6.7	)		(6.7	)
Total	$	(50.7	)	$	(32.7	)	$	(41.2	)

(a) For 2019, includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

(b) For 2020, includes charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a closed corrugated products facility during the second quarter of 2020. For 2019, includes charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility. For 2018, includes charges consisting of closure costs related to corrugated products facilities.

(c) Includes charges related to the discontinuation of production of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill in the second quarter of 2018 and the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(d) Includes charges for the property damage insurance deductible for a weather-related incident at one of our corrugated products facilities.

(e) Includes charges for acquisition and integration costs related to recent acquisitions.

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Income Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

7. Income Taxes

The following is an analysis of the components of the consolidated income tax provision (dollars in millions):

	Year Ended December 31,
	2020			2019		2018
Current income tax provision -
U.S. federal	$	109.4		$	123.2	$	150.7
State and local		27.5			37.0		42.9
Foreign		0.1			0.1		0.2
Total current provision for taxes		137.0			160.3		193.8
Deferred income tax provision (benefit) -
U.S. federal		26.8			55.3		34.7
State and local		8.0			5.0		4.0
Foreign		(0.1	)		—		—
Total deferred provision (benefit) for taxes		34.7			60.3		38.7
Total provision for taxes	$	171.7		$	220.6	$	232.5

The effective tax rate varies from the U.S. federal statutory tax rate principally due to the following (dollars in millions):

	2020			2019			2018
Provision computed at U.S. federal statutory rate of 21%	$	132.9		$	192.6		$	203.8
Federal tax reform		—			—			(2.0	)
State and local taxes, net of federal benefit		28.4			35.7			36.9
Goodwill impairment (a)		11.6			—			—
Other		(1.2	)		(7.7	)		(6.2	)
Total	$	171.7		$	220.6		$	232.5

(a) For additional information regarding the impairment of goodwill within our Paper reporting unit, see Note 8, Goodwill and Intangible Assets.

The following details the scheduled expiration dates of our tax effected net operating loss (NOL) and other tax carryforwards at December 31, 2020 (dollars in millions):

	2021 Through 2030		2031 Through 2040		Indefinite		Total
U.S. federal NOLs	$	25.6	$	—	$	—	$	25.6
State taxing jurisdiction NOLs		1.3		0.2		—		1.5
Non-U.S. taxing jurisdiction NOLs		—		0.1		—		0.1
U.S. federal tax credit carryforwards		0.1		—		—		0.1
U.S. federal and non-U.S. capital loss carryforwards		0.4		—		0.1		0.5
Total	$	27.4	$	0.3	$	0.1	$	27.8

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts for income tax purposes. Deferred income tax assets and liabilities at December 31 are summarized as follows (dollars in millions): 

	December 31,
	2020			2019
Deferred tax assets:
Pension and postretirement benefits	$	70.1		$	90.7
Lease obligations		60.6			59.2
Employee benefits and compensation		39.3			35.5
Net operating loss carryforwards		27.2			30.8
Restricted stock and performance units		9.6			11.2
Inventories		5.9			14.1
Accrued liabilities		5.3			6.1
Capital loss and general business credit carryforwards		0.6			3.2
Derivatives		0.1			0.1
Gross deferred tax assets		218.7			250.9
Valuation allowance (b)		(0.5	)		(3.0	)
Net deferred tax assets	$	218.2		$	247.9
Deferred tax liabilities:
Property, plant and equipment	$	(465.6	)	$	(459.1	)
Goodwill and intangible assets		(72.7	)		(70.8	)
Right-of-use assets		(59.3	)		(58.1	)
Total deferred tax liabilities	$	(597.6	)	$	(588.0	)
Net deferred tax liabilities (c)	$	(379.4	)	$	(340.1	)

(b) Deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. Both the 2020 and 2019 valuation allowance relates to capital losses. We do not expect to generate capital gains before the capital losses expire. If or when recognized, the tax benefits relating to the reversal of any or all of the valuation allowance would be recognized as a benefit to income tax expense.

(c) As of December 31, 2020, we did not recognize U.S. deferred income taxes on our cumulative total of undistributed foreign earnings for our foreign subsidiaries. We indefinitely reinvest our earnings in operations outside the United States. It is not practicable to determine the amount of unrecognized deferred tax liability on these undistributed earnings because the actual tax liability, if any, is dependent on circumstances existing when the repatriation occurs.

Cash payments for federal, state, and foreign income taxes were $115.6 million, $172.7 million, and $140.8 million for the years ended December 31, 2020, 2019, and 2018, respectively.

The following table summarizes the changes related to PCA’s gross unrecognized tax benefits excluding interest and penalties (dollars in millions):

	2020			2019				2018
Balance as of January 1	$	(4.8	)	$	(4.6	)	$	(4.8	)
Increases related to prior years’ tax positions		—			(0.1	)		(0.1	)
Increases related to current year tax positions		(0.4	)		(0.4	)		(0.3	)
Expiration of the statute of limitations		—			0.3			0.6
Balance at December 31	$	(5.2	)	$	(4.8	)	$	(4.6	)

At December 31, 2020, PCA had recorded a $5.2 million gross reserve for unrecognized tax benefits, excluding interest and penalties. Of the total, $4.6 million (net of the federal benefit for state taxes) would impact the effective tax rate if recognized.

PCA recognizes interest accrued related to unrecognized tax benefits and penalties as income tax expense. For both years ended December 31, 2020 and 2019, we had $1.2 million of interest and penalties recorded for unrecognized tax benefits.

During the next 12 months, it is possible that PCA's unrecognized tax benefits related to state apportionment issues could decrease by approximately $3.1 million due to settlements with state taxing authorities.

PCA is subject to income taxation in the United States, various state and local jurisdictions, Canada and Hong Kong.  A federal examination of the 2016 tax year commenced in April 2019. The tax years 2016 - 2020 remain open to federal examination. The tax years 2016 - 2020 remain open to state examinations. Some foreign tax jurisdictions are open to examination for the 2009 tax year forward. Through the Boise acquisition, PCA recorded net operating losses and credit carryforwards from 2008 through 2011 and 2013 that are subject to examinations and adjustments for at least three years following the year in which utilized.

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Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

8. Goodwill and Intangible Assets

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of goodwill and our long lived assets within our Paper reporting unit.

Goodwill

Due to the triggering event identified above an interim quantitative impairment analysis was performed as of May 31, 2020 for the Paper reporting unit, which is the same as our Paper reportable segment. We estimated the fair value of the Paper reporting unit using a combination of the income approach and the market approach, as further described below. Based on the evaluation performed, we determined that the carrying value of the Paper reporting unit exceeded its fair value, which resulted in a goodwill impairment charge totaling $55.2 million. The impairment charge is included in “Goodwill impairment” on our Consolidated Statements of Income and Comprehensive Income and is not tax deductible.

For purposes of our goodwill impairment analysis, we estimated the fair value of the Paper reporting unit using a combination of the income approach and the market approach applying an equal weighting. The income approach incorporated the estimated future cash flows and a terminal value discounted to their present value using an appropriate risk-adjusted discount rate. The estimated future cash flows and terminal value were based on internal forecasts and industry trends, including the long-term outlook for the paper industry. Our expected cash flows include assumptions about industry pricing, expected paper demand, and anticipated input and conversion costs. The discount rate utilized in the income approach was 9%, which was derived using a capital asset pricing model based on relevant industry data to estimate the cost of equity financing. The discount rate is commensurate with the risks and uncertainties inherent in the business and the cash flow forecasts, updated for recent events. The market approach estimated the fair value of the Paper reporting unit by using valuation metrics of publicly traded companies or historically completed transactions of comparable businesses.

The valuation of our Paper reporting unit requires significant judgment in evaluating recent indicators of market activity and estimated future cash flows, discount rates, and other factors. Our impairment analysis contains inherent uncertainties due to uncontrollable events that could positively or negatively impact anticipated future economic and operating conditions. In making these estimates, the weighted-average cost of capital is utilized to calculate the present value of future cash flows and terminal value. Many variables go into estimating future cash flows, including estimates of our future revenue growth and operating results. When estimating our projected revenue growth and future operating results, we considered industry trends, economic data, and our competitive situation.

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 both December 31, 2020 and 2019, we had $863.5 million of goodwill recorded in our Packaging segment on our Consolidated Balance Sheets. At December 31, 2020 and 2019, we had $0 million and $55.2 million of goodwill recorded in our Paper segment on our Consolidated Balance Sheets, respectively.

Changes in the carrying amount of our goodwill were as follows (dollars in millions):

						Total
	Packaging		Paper			Goodwill
Balance at January 1, 2019	$	862.1	$	55.2		$	917.3
Acquisitions (a)		1.4		—			1.4
Balance at December 31, 2019		863.5		55.2			918.7
Impairment of Paper segment		—		(55.2	)		(55.2	)
Balance at December 31, 2020	$	863.5	$	—		$	863.5

(a) During 2019, the Company recorded a $1.4 million adjustment to increase the goodwill balance for the Company’s October 2018 acquisition of Englander.

Intangible Assets

Intangible assets are comprised of customer relationships and trademarks and trade names. As a result of the triggering event described above, we also performed a recoverability test on our long-lived assets within the Paper segment, including long lived intangible assets, as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long lived assets within our Paper segment, inclusive of the long lived intangible assets, were 100% recoverable.

The weighted average useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):

	As of December 31, 2020						As of December 31, 2019
	Weighted Average Remaining Useful Life (in Years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Remaining Useful Life (in Years)		Gross Carrying Amount		Accumulated Amortization
Customer relationships (b)(c)		9.1	$	503.8	$	220.2		10.0	$	503.8	$	180.2
Trademarks and trade names		9.3		34.8		23.0		9.5		34.8		20.6
Other		1.2		4.3		3.8		2.1		4.3		3.3
Total intangible assets (excluding goodwill)		9.1	$	542.9	$	247.0		9.9	$	542.9	$	204.1

(b) During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

(c) During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million.

Amortization expense was $42.9 million (including the $4.5 million adjustment to the customer relationships intangible asset related to the San Lorenzo, California facility closure, which was written off to amortization expense), $38.6 million, and $40.5 million for the years ended December 31, 2020, 2019, and 2018, respectively. Estimated amortization expense of intangible assets over the next five years is expected to approximate $37.3 million (2021), $34.9 million (2022), $33.9 million (2023), $33.4 million (2024), and $33.2 million (2025).

Impairment Testing

We test goodwill for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. Additionally, when we experience changes to our business or operating environment, we evaluate the remaining useful lives and recoverability of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives or impairment are necessary. As discussed above, as a result of the COVID-19 pandemic, we performed an interim quantitative impairment analysis of the goodwill and long-lived assets, including intangible assets, within our Paper reporting unit as of May 31, 2020 and recorded a goodwill impairment charge of $55.2 million. We also completed our annual test in the fourth quarter, and there was no further indication of goodwill or intangible asset impairment.

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Accrued Liabilities

12 Months Ended

Dec. 31, 2020

Accrued Liabilities Current And Noncurrent [Abstract]

Accrued Liabilities

9. Accrued Liabilities

The components of accrued liabilities were as follows (dollars in millions):

	December 31,
	2020		2019
Compensation and benefits	$	126.5	$	124.5
Customer volume discounts and rebates		27.1		27.9
Medical insurance and workers’ compensation		25.5		26.3
Franchise, property, sales and use taxes		16.5		15.3
Environmental liabilities and asset retirement obligations		4.6		5.6
Severance, retention, and relocation		4.1		3.5
Other		11.9		14.4
Total	$	216.2	$	217.5

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Debt

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Debt

10. Debt

At December 31, 2020 and 2019, our long-term debt and interest rates on that debt were as follows (dollars in millions):

	December 31, 2020					December 31, 2019
	Amount		Interest Rate			Amount		Interest rate
Revolving Credit Facility, due August 2021	$	—		—	%	$	—		—	%
4.50% Senior Notes, net of discount of $0.6 million    and $0.8 million as of December 31, 2020 and 2019,    respectively, due November 2023		699.4		4.50	%		699.2		4.50	%
3.65% Senior Notes, net of discount of $0.5 million    and $0.6 million as of December 31, 2020 and 2019,    respectively, due September 2024		399.5		3.65	%		399.4		3.65	%
3.40% Senior Notes, net of discount of $1.2 million    and $1.3 million as of December 31, 2020 and 2019,    respectively, due December 2027		498.8		3.40	%		498.7		3.40	%
3.00% Senior Notes, net of discount of $0.6 million    and $0.7 million as of December 31, 2020 and 2019,    respectively, due December 2029		499.4		3.00	%		499.3		3.00	%
4.05% Senior Notes, net of discount of $3.4 million    and $3.5 million as of December 31, 2020 and 2019,    respectively, due December 2049		396.6		4.05	%		396.5		4.05	%
Total		2,493.7		3.77	%		2,493.1		3.77	%
Less current portion		—		—	%		—		—	%
Less unamortized debt issuance costs		14.3					16.3
Total long-term debt	$	2,479.4		3.77	%	$	2,476.8		3.77	%

On November 21, 2019, the Company issued $500.0 million of 3.00% senior notes due 2029 and $400.0 million of 4.05% senior notes due 2049, through a registered public offering and notified the holders of its $500.0 million of 2.45% notes due December 15, 2020 and $400.0 million of 3.90% notes due June 15, 2022 that it would redeem those notes in December 2019. On December 6, 2019, PCA completed the redemption of the old 2.45% notes for $509.7 million, which included a redemption premium of $3.8 million and $5.8 million of accrued and unpaid interest. On December 23, 2019, PCA completed the redemption of the old 3.90% notes for $418.7 million, which included a redemption premium of $18.4 million and $0.3 million of accrued and unpaid interest. PCA used the proceeds of the offering of the new 3.00% and 4.05% notes and cash on hand to fund the redemptions and the $8.3 million of debt issuance costs. The debt issuance costs are amortized to interest expense using the effective interest method over the terms of the notes.

As of December 31, 2020, the details of our borrowings were as follows:

• Senior Unsecured Credit Agreement. On August 29, 2016, we entered into an amended and restated credit facility, which included a term loan facility (that was subsequently repaid in full in 2017) to finance an acquisition and a five-year revolving credit facility to 2021. Currently, our credit facility only includes a $350.0 million unsecured revolving credit facility with variable interest (LIBOR plus a margin) due August 2021. During 2020, we did not borrow under the Revolving Credit Facility. At December 31, 2020, we had $23.7 million of outstanding letters of credit that were considered outstanding on the revolving credit facility, resulting in $326.3 million of unused borrowing capacity. The outstanding letters of credit were primarily for workers compensation. We are required to pay commitment fees on the unused portions of the credit facility.

• 4.50% Senior Notes. On October 22, 2013, we issued $700.0 million of 4.50% senior notes due November 1, 2023, through a registered public offering.

• 3.65% Senior Notes. On September 5, 2014, we issued $400.0 million of 3.65% senior notes due September 15, 2024, through a registered public offering.

• 3.40% Senior Notes. On December 13, 2017, we issued $500.0 million of 3.40% senior notes due December 15, 2027, through a registered public offering.

• 3.00% Senior Notes. On November 21, 2019, we issued $500.0 million of 3.00% senior notes due December 15, 2029, through a registered public offering.

• 4.05% Senior Notes. On November 21, 2019, we issued $400.0 million of 4.05% senior notes due December 15, 2049, through a registered public offering.

The instruments governing our indebtedness contain financial and other covenants that limit the ability of PCA and its subsidiaries to enter into sale and leaseback transactions, incur liens, incur indebtedness at the subsidiary level, enter into certain transactions with affiliates, merge or consolidate with any other person or sell or otherwise dispose of all or substantially all of our assets. Our credit facility also requires us to comply with certain financial covenants, including maintaining a minimum interest coverage ratio and a maximum leverage ratio. A failure to comply with these restrictions could lead to an event of default, which could result in an acceleration of any outstanding indebtedness and/or prohibit us from drawing on the revolving credit facility. An acceleration under the revolving credit facility may also constitute an event of default under the senior notes indenture. At December 31, 2020, we were in compliance with these covenants.

At December 31, 2020, we have $2,493.7 million of fixed-rate senior notes outstanding. At December 31, 2020, the fair value of our fixed-rate debt was estimated to be $2,827.1 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), discussed further in Note 2, Summary of Significant Accounting Policies.

Repayments, Interest, and Other

In 2020, we did not repay any outstanding debt, as we did not have any maturities of our Senior Notes during 2020.

In December 2019, we used the net proceeds from the November 2019 offering of the new 3.00% and 4.05% notes and cash on hand to redeem the 2.45% notes and 3.90% notes. We completed the redemption of the old 2.45% notes and 3.90% notes for $509.7 million and $418.7 million, respectively, which included redemption premiums and accrued and unpaid interest.

In 2018, we used cash on hand to repay debt outstanding of $150.0 million under the 6.50% Senior Notes due March 15, 2018 at maturity.

As of December 31, 2020, annual principal maturities for debt, excluding unamortized debt discount, are: none for 2021 through 2022, $700.0 million for 2023; $400.0 million for 2024; and $1.4 billion for 2025 and thereafter.

Interest payments paid in connection with the Company’s debt obligations for the years ended December 31, 2020, 2019, and 2018 were $97.0 million, $114.0 million (including redemption premiums of $22.2 million), and $97.0 million, respectively.

Included in interest expense, net, are amortization of financing costs and, for 2019 and 2018, amortization of treasury lock settlements. Amortization of financing costs in 2020, 2019, and 2018 was $2.0 million, $4.5 million (including a $1.8 million write-off of deferred debt issuance costs related to the November 2019 debt refinancing), and $2.7 million, respectively. Amortization of treasury lock settlements was an $18.2 million net loss in 2019 (including a $13.1 million write-off of the remaining balance for treasury locks related to the November 2019 debt refinancing) and a $5.3 million net loss in 2018.

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Cash, Cash Equivalents, and Marketable Debt Securities

12 Months Ended

Dec. 31, 2020

Cash Cash Equivalents And Short Term Investments [Abstract]

Cash, Cash Equivalents, and Marketable Debt Securities

11.Cash, Cash Equivalents, and Marketable Debt Securities

The following table shows the Company’s cash and available-for-sale (AFS) debt securities by major asset category at December 31, 2020 and 2019 (in millions):

	December 31, 2020
	Adjusted Cost Basis		Unrealized Gain		Unrealized Loss		Fair Value		Cash and Cash Equivalents		Short-Term Marketable Debt Securities		Long-Term Marketable Debt Securities
Cash and cash equivalents	$	970.5	$	—	$	—	$	970.5	$	970.5	$	—	$	—
Level 1 (a):
Money market funds		0.6		—		—		0.6		0.6		—		—
U.S. Treasury securities		28.1		0.2		—		28.3		—		18.9		9.4
Subtotal		28.7		0.2		—		28.9		0.6		18.9		9.4
Level 2 (b):
Certificates of deposit		5.9		—		—		5.9		1.1		4.8		—
Commercial paper		3.2		—		—		3.2		1.0		2.2		—
U.S. government agency securities		6.6		—		—		6.6		—		2.6		4.0
Corporate debt securities		107.5		0.3		—		107.8		1.4		77.1		29.3
Subtotal		123.2		0.3		—		123.5		3.5		86.7		33.3
Total	$	1,122.4	$	0.5	$	—	$	1,122.9	$	974.6	$	105.6	$	42.7

	December 31, 2019
	Adjusted Cost Basis		Unrealized Gain		Unrealized Loss		Fair Value (c)		Cash and Cash Equivalents		Short-Term Marketable Debt Securities		Long-Term Marketable Debt Securities
Cash and cash equivalents	$	675.6					$	675.6	$	675.6	$	—	$	—
Level 1 (a):
Money market funds		0.1		—		—		0.1		0.1		—		—
U.S. Treasury securities		27.1		—		—		27.1		3.1		11.5		12.5
Subtotal		27.2		—		—		27.2		3.2		11.5		12.5
Level 2 (b):
Certificates of deposit		3.9		—		—		3.9		—		3.9		—
Commercial paper		5.6		—		—		5.6		0.7		4.9		—
U.S. government agency securities		7.0		—		—		7.0		—		3.0		4.0
Corporate debt securities		106.2		—		—		106.2		—		64.6		41.6
Subtotal		122.7		—		—		122.7		0.7		76.4		45.6
Total	$	825.5	$	—	$	—	$	825.5	$	679.5	$	87.9	$	58.1

(a) Valuations based on quoted prices for identical assets and liabilities in active markets.

(b) Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

(c) Unrealized gains and losses were insignificant as of December 31, 2019. Therefore, the fair value approximates the adjusted cost basis for each major asset category.

For the year ended December 31, 2020 and 2019, net realized gains and losses on the sales and maturities of certain marketable debt securities were insignificant.  

The Company invests in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. The Company’s investment policy requires securities to be investment grade and limits the amount of credit exposure to any one issuer. The maturities of the Company’s long-term marketable debt securities generally range from one to two years.

Fair values were determined for each individual marketable debt security in the investment portfolio. When evaluating a marketable debt security for other-than-temporary impairment, PCA reviews factors such as the duration and extent to which the fair value of the marketable debt security is less than its cost, the financial condition of the issuer and any changes thereto, the general market condition in which the issuer operates, and PCA's intent to sell or whether it will be more likely than not be required to sell, the marketable debt security before recovery of its amortized cost basis.

As of December 31, 2020 and 2019, we do not consider any of the impairments related to our marketable debt securities to be the result of credit losses. Therefore, we have not recorded an allowance for credit losses related to our marketable debt securities. All unrealized gains and losses were recorded in OCI. Additionally, we recorded no other-than-temporary impairment charges on our AFS securities for the year ended December 31, 2019 under prior year guidance ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities.

The following table provides information about the Company’s marketable debt securities that have been in a continuous loss position as of December 31, 2020 and 2019 (in millions, except number of marketable debt securities in a loss position):

	December 31, 2020						December 31, 2019
	Fair Value of Marketable Debt Securities		Number of Marketable Debt Securities in a Loss Position		Unrealized Losses (d)		Fair Value of Marketable Debt Securities		Number of Marketable Debt Securities in a Loss Position		Unrealized Losses (d)
Corporate debt securities	$	42.9		56	$	—	$	63.3		61	$	—
Commercial paper		2.2		1		—		0.8		1		—
U.S. Treasury securities		1.7		3		—		14.0		9		—
Certificates of deposit		1.3		2		—		—		—		—
	$	48.1		62	$	—	$	78.1		71	$	—

(d) Unrealized losses were insignificant for the periods ended December 31, 2020 and 2019.

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Employee Benefit Plans and Other Postretirement Benefits

12 Months Ended

Dec. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans and Other Postretirement Benefits

12. Employee Benefit Plans and Other Postretirement Benefits

PCA has defined pension benefit plans for both salaried and hourly employees. The plans covering salaried employees are closed to new entrants with only certain current active participants still accruing benefits. The plans covering certain hourly employees are closed to new participants. We also have a Supplemental Executive Retirement Plan (SERP) and other nonqualified defined benefit pension plans that provide unfunded supplemental retirement benefits to certain of our current and former management employees. The SERP provides for incremental pension benefits in excess of those offered in our principal pension plans.

Other Postretirement Benefits

PCA provides postretirement medical benefits for certain retired salaried employees and postretirement medical and life insurance benefits for certain hourly employees. The plan covering salaried employees is closed to new participants.      

Obligations and Funded Status of Defined Benefit Pension and Other Postretirement Benefits Plans

The funded status of PCA's plans change from year to year based on the plan asset investment return, contributions, benefit payments, the discount rate used to measure the liability, and expected participant longevity. The following table, which includes only company-sponsored defined benefit and other postretirement benefit plans, reconciles the beginning and ending balances of the projected benefit obligation and the fair value of plan assets. We recognize the unfunded status of these plans on the Consolidated Balance Sheets, and we recognize changes in funded status in the year changes occur through the Consolidated Statements of Comprehensive Income (dollars in millions):

	Pension Plans						Postretirement Plans
	Year Ended December 31						Year Ended December 31
	2020			2019			2020			2019
Change in Benefit Obligation:
Benefit obligation at beginning of period	$	1,420.1		$	1,204.9		$	14.5		$	14.6
Service cost		23.0			24.5			0.3			0.3
Interest cost		39.8			47.0			0.4			0.5
Plan amendments		1.3			2.3			—			(0.3	)
Actuarial (gain) loss (a)		132.0			188.6			(1.5	)		0.2
Participant contributions		—			—			0.9			1.1
Benefits paid		(50.6	)		(47.2	)		(1.5	)		(1.9	)
Benefit obligation at plan year end	$	1,565.6		$	1,420.1		$	13.1		$	14.5
Accumulated benefit obligation portion of above	$	1,520.4		$	1,374.4
Change in Fair Value of Plan Assets:
Plan assets at fair value at beginning of period	$	1,073.8		$	873.2		$	—		$	—
Actual return on plan assets		193.8			188.9			—			—
Company contributions		83.7			58.9			0.6			0.8
Participant contributions		—			—			0.9			1.1
Benefits paid		(50.6	)		(47.2	)		(1.5	)		(1.9	)
Fair value of plan assets at plan year end	$	1,300.7		$	1,073.8		$	—		$	—
Underfunded status	$	(264.9	)	$	(346.3	)	$	(13.1	)	$	(14.5	)
Amounts Recognized on Consolidated Balance Sheets:
Current liabilities		(1.2	)		(1.4	)		(0.6	)		(0.7	)
Noncurrent liabilities		(263.7	)		(344.9	)		(12.5	)		(13.8	)
Accrued obligation recognized at December 31	$	(264.9	)	$	(346.3	)	$	(13.1	)	$	(14.5	)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Prior service cost (credit)	$	21.7		$	24.7		$	(4.9	)	$	(5.3	)
Actuarial loss (gain)		223.5			239.2			(5.5	)		(4.4	)
Total	$	245.2		$	263.9		$	(10.4	)	$	(9.7	)

(a) For the year ended December 31, 2020, the most significant driver of the increase in benefit obligations for the plans was the actuarial losses due to the decrease in the discount rate assumption. The OPEB plans experienced a net actuarial gain primarily due to changes in demographic assumptions that were partially offset by the effect of the change in the discount rate assumption. For the year ended December 31, 2019, the benefit obligation loss for the pension plans was due largely to a decrease in the discount rate assumption and a change in the mortality assumption to adopt the Society of Actuaries’ newly released longevity study. For the OPEB plans, the net loss on the benefit obligation was driven by the decrease in the discount rate assumption partially offset by the effect of favorable demographic experience and the repeal of the excise tax originally implemented with the Affordable Care Act.

Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss

The components of net periodic benefit cost and other comprehensive (income) loss (pretax) were as follows (dollars in millions):

	Pension Plans									Postretirement Plans
	Year Ended December 31,									Year Ended December 31,
	2020			2019			2018			2020			2019			2018
Service cost	$	23.0		$	24.5		$	25.0		$	0.3		$	0.3		$	0.3
Interest cost		39.8			47.0			42.4			0.4			0.5			0.5
Expected return on plan assets		(56.8	)		(52.1	)		(56.7	)		—			—			—
Net amortization of unrecognized amounts:
Prior service cost (credit)		4.3			6.3			6.9			(0.4	)		(0.3	)		(0.3	)
Actuarial loss (gain)		10.8			7.0			9.4			(0.4	)		(0.4	)		(0.2	)
Net periodic benefit cost	$	21.1		$	32.7		$	27.0		$	(0.1	)	$	0.1		$	0.3
Changes in plan assets and benefit obligations    recognized in other comprehensive (income)    loss:
Actuarial net loss (gain)	$	(5.0	)	$	51.8		$	(4.6	)	$	(1.5	)	$	0.2		$	(1.2	)
Prior service cost (credit)		1.3			2.3			3.0			—			(0.3	)		(0.3	)
Amortization of prior service cost (credit)		(4.3	)		(6.3	)		(6.9	)		0.4			0.3			0.3
Amortization of actuarial loss (gain)		(10.8	)		(7.0	)		(9.4	)		0.4			0.4			0.2
Total recognized in other comprehensive    loss (income) (b)	$	(18.8	)	$	40.8		$	(17.9	)	$	(0.7	)	$	0.6		$	(1.0	)
Total recognized in net periodic benefit    cost and other comprehensive loss (income)    (pre-tax)	$	2.3		$	73.5		$	9.2		$	(0.8	)	$	0.7		$	(0.7	)

(b) Accumulated losses in excess of 10% of the greater of the projected benefit obligation or the market-related value of assets will be recognized on a straight-line basis over the average remaining service period of active employees in PCA plans (which is between seven and nine years) and over the average remaining lifetime of inactive participants of Boise plans (which is between 23 and 26 years), to the extent that losses are not offset by gains in subsequent years.

The accumulated benefit obligations for the plans with obligations in excess of plan assets is $1.4 billion.

Assumptions

The following table presents the assumptions used in the measurement of our benefits obligations:

	Pension Plans			Postretirement Plans
	December 31,			December 31,
	2020	2019	2018	2020	2019	2018
Weighted-Average Assumptions Used to    Determine Benefit Obligations at    December 31:
Discount rate	2.57%	3.25%	4.31%	2.60%	3.18%	4.21%
Rate of compensation increase	4.00%	4.00%	4.00%	N/A	N/A	N/A
Weighted-Average Assumptions Used to    Determine Net Periodic Benefit Cost for the    Years Ended December 31:
Discount rate	3.25%	4.31%	3.66%	3.18%	4.21%	3.57%
Expected return on plan assets	5.29%	6.06%	6.06%	N/A	N/A	N/A
Rate of compensation increase	4.00%	4.00%	4.00%	N/A	N/A	N/A

Discount Rate Assumption. The discount rate reflects the current rate at which the pension obligations could be settled on the measurement date: December 31. The discount rate assumption used to calculate the present value of pension and postretirement benefit obligations reflects the rates available on high-quality, fixed-income debt instruments at December 31. In all periods, the bonds included in the models reflect anticipated investments that would be made to match the expected monthly

benefit payments over time. The plans' projected cash flows were duration-matched to these models to develop an appropriate discount rate.

Asset Return Assumption. The expected return on plan assets reflects the expected long-term rates of return for the categories of investments currently held in the plans as well as anticipated returns for additional contributions made in the future. The expected long-term rate of return is adjusted when there are fundamental changes in expected returns on the plan investments. The weighted-average expected return on plan assets we will use in our calculation of 2021 net periodic pension benefit cost is 4.91%.

Rate of Compensation Increase. The rate of compensation increase is determined by PCA based upon annual reviews. The compensation increase assumption is not applicable for all plans as many of our pension plans are frozen and not accruing benefits.

Health Care Cost Trend Rate Assumptions. PCA assumed health care cost trend rates for its postretirement benefits plans were as follows:

	2020	2019	2018
Health care cost trend rate assumed for next year	6.82%	7.09%	7.24%
Rate to which the cost trend rate is assumed to decline    (the ultimate trend rate)	4.50%	4.50%	4.44%
Year that the rate reaches the ultimate trend rate	2029	2029	2028

Postretirement Health Care Plan Assumptions. For postretirement health care plan accounting, PCA reviews external data and its own historical trends for health care costs to determine the health care cost trend rate assumption.

Investment Policies and Strategies

PCA has retained the services of professional advisors to oversee pension investments and provide recommendations regarding investment strategy. PCA’s overall strategy and related apportionments between equity and debt securities may change from time to time based on market conditions, external economic factors, and the funded status of the plans. The general investment objective for all of our plan assets is to optimize growth of the pension plan trust assets, while minimizing the risk of significant losses to enable the plans to satisfy their benefit payment obligations over time. The objectives take into account the long-term nature of the benefit obligations, the liquidity needs of the plans, and the expected risk/return trade-offs of the asset classes in which the plans may choose to invest. Assets of our pension plans were invested in the following classes of securities at December 31, 2020 and 2019:

	Percentage of Fair Value at December 31,
	2020			2019
Fixed income securities		48	%		50	%
International equity securities		29	%		27	%
Domestic equity securities		21	%		22	%
Other		2	%		1	%

At December 31, 2020, the targeted investment allocations differed between the plans based on funded status. Our retirement committee reviews the investment allocations for reasonableness at a minimum, semi-annually.

Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility risk, all of which are subject to change. Due to the level of risk associated with some investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term, and such changes could materially affect the reported amounts.

Fair Value Measurements of Plan Assets

The following tables set forth, by level within the fair value hierarchy, discussed in Note 2, Summary of Significant Accounting Policies, the pension plan assets, by major asset category, at fair value at December 31, 2020 and 2019 (dollars in millions):

	Fair Value Measurements at December 31, 2020
Asset Category	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Net Asset Value (NAV) (a)		Total
Short-term investments	$	—	$	25.1	$	—	$	—	$	25.1
Common/collective trust funds:
International equities		198.4		32.8		—		136.9		368.1
Domestic equities		—		276.9		—		—		276.9
Corporate and government bonds:
Corporate bonds		—		318.3		—		—		318.3
Government bonds and agencies		—		243.4		—		—		243.4
Fixed income		—		49.4		—		—		49.4
Municipal bonds		—		15.9		—		—		15.9
Private equity securities (b)		—		—		2.0		—		2.0
Total securities at fair value	$	198.4	$	961.8	$	2.0	$	136.9	$	1,299.1
Accrued income										1.6
Total fair value of plan assets									$	1,300.7

	Fair Value Measurements at December 31, 2019
Asset Category	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Net Asset Value (NAV) (a)		Total
Cash and short-term investments	$	—	$	14.9	$	—	$	—	$	14.9
Common/collective trust funds:
International equities		163.0		20.8		—		102.3		286.1
Domestic equities		—		240.5		—		—		240.5
Corporate and government bonds:
Fixed income		140.4		154.6		—		—		295.0
Government bonds and agencies		—		160.7		—		—		160.7
Corporate bonds		—		70.6		—		—		70.6
Municipal bonds		—		5.8				—		5.8
Private equity securities (b)		—		—		2.6		—		2.6
Total securities at fair value	$	303.4	$	667.9	$	2.6	$	102.3	$	1,076.2
Accrued expenses and receivables										(2.4	)
Total fair value of plan assets									$	1,073.8

(a) In accordance with ASC 820, Fair Value Measurement, certain investments that do not have readily-determinable fair values are measured at fair value using the net asset value (NAV) per share practical expedient and are not classified within the fair value hierarchy.

(b) Investments in this category are invested in the Pantheon Global Secondary Fund IV, LP. The fund specializes in investments in the private equity secondary market and occasionally directly in private companies to maximize capital growth. Fund investments are carried at fair value as determined quarterly using the market approach to estimate the fair value of private investments. The market approach utilizes prices and other relevant information generated by market transactions, type of security, size of the position, degree of liquidity, restrictions on the disposition, latest round of financing data, current financial position, and operating results, among other factors. In circumstances where fair values are not provided with respect to any of the company's fund investments, the investment advisor will seek to determine the fair value of such investments based on information provided by the general partners or managers of such funds or from other sources. Audited financial statements are provided by fund management annually. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the ultimate underlying investee companies means that there are inherent difficulties in determining the value of the investments. Amounts realized on the sale of these

investments may differ from the calculated values. Boise had originally committed to a $15.0 million investment, with $2.0 million of the commitment unfunded at December 31, 2020.

The following table sets forth a summary of changes in the fair value of the pension plans' Level 3 assets for the year ended December 31, 2020 (dollars in millions):

	2020
Balance, beginning of year	$	2.6
Acquisitions		—
Purchases		—
Sales		(0.6	)
Unrealized gain		—
Balance, end of year	$	2.0

Funding and Cash Flows

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 discretionary contributions based on the funded status of the plans, tax deductibility, income from operations, and other factors. In 2020, 2019, and 2018, we made contributions of $82.5 million, $57.9 million, and $21.8 million, respectively, to our qualified pension plans. We do not have a required minimum contribution amount established for 2021, but we expect to make discretionary contributions to our plans.

The following are estimated benefit payments to be paid to current plan participants by year (dollars in millions). Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the Company.

	Pension Plans		Postretirement Plans
2021	$	56.5	$	0.5
2022		60.2		0.5
2023		63.9		0.5
2024		67.0		0.5
2025 - 2030		456.2		3.4

Defined Contribution Plans

Some of our employees participate in contributory defined contribution savings plans, available to most of our salaried and hourly employees. The defined contribution plans permit participants to make contributions by salary reduction pursuant to Section 401(k) of the Code. PCA made employer-matching contributions of $40.8 million, $39.0 million, and $36.8 million in 2020, 2019, and 2018, respectively. All company-matching contributions to all employees were made in cash. We expense employer matching contributions and charge dividends on shares held by the ESOP to retained earnings. Shares of company stock held by the ESOP are included in basic shares for earnings-per-share computations. At December 31, 2020 and 2019, the ESOP held 1.2 million and 1.5 million shares of Company stock, respectively.

Certain salaried and hourly employees that are not participating in a PCA sponsored defined benefit pension plan receive a service-related company retirement contribution to their defined contribution plan account in addition to any employer matching contribution. This contribution increases with years of service and ranges from 3% to 5% of base pay. We contributed $39.4 million, $36.7 million, and $33.3 million for this retirement contribution during the years ended December 31, 2020, 2019, and 2018, respectively.

Deferred Compensation Plans

Key managers can elect to participate in a deferred compensation plan. The deferred compensation plan is unfunded; therefore, benefits are paid from our general assets. At December 31, 2020 and 2019, we had $22.6 million and $17.4 million, respectively, of liabilities attributable to participation in our deferred compensation plan on our Consolidated Balance Sheets.

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Asset Retirement Obligations

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations

13. Asset Retirement Obligations

Our asset retirement obligations relate predominantly to landfill closure, wastewater treatment pond dredging, closed-site monitoring costs, and certain leasehold improvements. In accordance with ASC 410, Asset Retirement and Environmental Obligations, we recognize the fair value of these liabilities as an asset retirement obligation and capitalize that cost as part of the cost basis of the related asset in the period in which the costs are incurred if sufficient information is available to reasonably estimate the fair value of the obligation. Fair value estimates are determined using Level 3 inputs in the fair value hierarchy. The fair value of our asset retirement obligations is measured using expected future cash outflows discounted using the Company's credit-adjusted risk-free interest rate. Over time, the liability is accreted to its settlement value, and the capitalized cost is depreciated over the useful life of the related asset. These liabilities are based on the best estimate of costs and are updated periodically to reflect current technology, laws and regulations, inflation, and other economic factors. Occasionally, we become aware of events or circumstances that require us to revise our future estimated cash flows. When revisions become necessary, we recalculate our obligation and adjust our asset and liability accounts utilizing appropriate discount rates. No assets are legally restricted for purposes of settling asset retirement obligations. Upon settlement of the liability, we will recognize a gain or loss for any difference between the settlement amount and the liability recorded.

The following table describes changes to the asset retirement obligation liability (dollars in millions):

	Year Ended December 31,
	2020			2019
Asset retirement obligation at beginning of period	$	27.8		$	30.0
Accretion expense		1.3			1.5
Payments		(0.8	)		(3.5	)
Revisions in estimated cash flows (a)		3.5			(0.2	)
Asset retirement obligation at end of period	$	31.8		$	27.8

(a) For 2020, primarily consists of an adjustment of $4.5 million related to the San Lorenzo, California facility closure.

We have additional asset retirement obligations with indeterminate settlement dates. The fair value of these asset retirement obligations cannot be estimated due to the lack of sufficient information to estimate the settlement dates of the obligations. These asset retirement obligations include, for example, (i) removal and disposal of potentially hazardous materials related to equipment and/or an operating facility if the equipment and/or facilities were to undergo major maintenance, renovation, or demolition and (ii) storage sites or owned facilities for which removal and/or disposal of chemicals and other related materials are required if the operating facility is closed. We will recognize a liability in the period in which sufficient information becomes available to reasonably estimate the fair value of these obligations.

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Share-Based Compensation

12 Months Ended

Dec. 31, 2020

Share Based Compensation [Abstract]

Share-Based Compensation

14. Share-Based Compensation

The Company has a long-term equity incentive plan, which allows for grants of stock options, stock appreciation rights, restricted stock, and performance awards to directors, officers, and employees, as well as others who engage in services for PCA. On February 25, 2020, our board of directors approved and, on May 5, 2020, our stockholders approved, the amendment and restatement of the plan. The amendment extended the plan’s term to May 5, 2030 and increased the number of shares of common stock available for issuance under the plan by 1.4 million shares. The total number of shares authorized for past and future awards is 12.0 million shares.

As of December 31, 2020, assuming performance units are measured at the target level of performance, 1.5 million shares remained available for future issuance under the current plan. Forfeitures are added back to the pool of shares of common stock available to be granted at a future date.

Restricted Stock

Restricted stock awards granted to officers and employees generally vest at the end of a four-year period, and restricted stock awards granted to directors vest immediately. A summary of the Company’s restricted stock activity follows:

	2020					2019					2018
	Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value
Restricted stock at January 1		716,952		$	94.50		743,591		$	86.90		739,732		$	77.23
Granted		204,960			94.25		199,499			95.48		173,144			114.63
Vested (a)		(244,823	)		72.11		(212,809	)		68.59		(165,547	)		72.84
Forfeitures		(7,987	)		99.94		(13,329	)		98.86		(3,738	)		78.66
Restricted stock at December 31		669,102		$	102.55		716,952		$	94.50		743,591		$	86.90

(a) The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $23.6 million, $19.9 million, and $18.9 million, respectively.

Performance Units

Performance unit awards granted to certain key employees are earned based on the achievement of defined performance rankings of Return on Invested Capital (ROIC) or Total Shareholder Return (TSR) compared to ROIC and TSR for peer companies. ROIC performance unit awards vest four years after the grant date, while TSR performance unit awards vest approximately three years after the grant date. Both ROIC and TSR performance units are paid out entirely in shares of the Company’s common stock. A summary of the Company’s performance unit activity follows:

	2020					2019					2018
	Units			Weighted Average Grant- Date Fair Value		Units			Weighted Average Grant- Date Fair Value		Units			Weighted Average Grant- Date Fair Value
Performance units at January 1		323,147		$	96.56		266,704		$	90.01		226,558		$	77.07
Granted		111,287			99.20		109,545			97.24		83,515			115.35
Vested (b)		(77,017	)		67.57		(53,102	)		65.03		(43,369	)		71.19
Performance units at December 31		357,417		$	103.63		323,147		$	96.56		266,704		$	90.01

(b) The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $8.5 million, $5.5 million, and $5.4 million, respectively. Upon vesting of the awards in 2020, 2019, and 2018, PCA issued 86,015 shares, 59,165 shares, and 46,876 shares, respectively. For 2020, 2019, and 2018, these amounts included 8,998 shares, 6,063 shares, and 3,507 shares, respectively, for dividends accrued during the vesting period.

Compensation Expense

Our share-based compensation expense is recorded in “Cost of sales” and “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):

	Year Ended December 31,
	2020			2019			2018
Restricted stock	$	20.1		$	22.6		$	18.6
Performance units		9.9			7.8			4.9
Impact on income before income taxes		30.0			30.4			23.5
Income tax benefit		(7.6	)		(7.6	)		(5.9	)
Impact on net income	$	22.4		$	22.8		$	17.6

The fair value of restricted stock is determined based on the closing price of the Company’s stock on the grant date. Compensation expense, net of estimated forfeitures, is recorded over the requisite service period. As PCA’s Board of Directors has the ability to accelerate the vesting of these awards upon an employee’s retirement, the Company accelerates the recognition of compensation expense for certain employees approaching normal retirement age.

For performance unit awards made in 2020. 2019, and 2018, in terms of grant date value, 50% used TSR as the performance measure and 50% used ROIC as the performance measure. All units awarded before 2018 used ROIC as the performance measure. The ROIC component of performance unit awards are valued based on the closing price of the stock on the grant date. As the ROIC component contains a performance condition, compensation expense, net of estimated forfeitures, is recorded over the requisite service period based on the most probable number of awards expected to vest. The TSR component of performance unit awards is valued using a Monte Carlo simulation as the TSR component contains a market condition. The Monte Carlo simulation estimates the fair value of the TSR component based on the expected term of the award, a risk-free interest rate, expected dividends, and expected volatility of the Company’s common stock and the common stock of the peer companies. Compensation expense is recorded ratably over the expected term of the award.

The unrecognized compensation expense for all share-based awards was as follows (dollars in millions):

	December 31, 2020
	Unrecognized Compensation Expense		Remaining Weighted Average Recognition Period (in years)
Restricted stock	$	25.8	2.5
Performance units		17.6	2.2
Total unrecognized share-based compensation expense	$	43.4		2.3

We evaluate share-based compensation expense on a quarterly basis based on our estimate of expected forfeitures, review of recent forfeiture activity, and expected future turnover. We recognize the effect of adjusting the forfeiture rate for all expense amortization in the period that we change the forfeiture estimate. The effect of forfeiture adjustments was insignificant in all periods presented.

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Derivative Instruments and Hedging Activities

12 Months Ended

Dec. 31, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

15. Derivative Instruments and Hedging Activities

Hedging Strategy

When appropriate, we use derivatives as a risk management tool to mitigate the potential impact of certain market risks. The primary risks managed by using derivative financial instruments are interest rate risks. We do not enter into derivative financial instruments for trading or speculative purposes.

Interest Rate Risk

The Company has used treasury lock derivative instruments to manage interest costs and the risk associated with changing interest rates. In connection with contemplated issuances of ten-year debt securities, PCA entered into interest rate protection agreements with counterparties in 2008, 2010, and 2011 to protect against increases in the ten-year U.S. Treasury Note rate. These treasury rates served as references in determining the interest rates applicable to the debt securities the Company issued in March 2008 and June 2012. As a result of changes in the interest rates on those treasury securities between the time PCA entered into the derivative agreements and the time PCA priced and issued the debt securities, the Company: (1) made a payment of $4.4 million to the counterparty upon settlement of the 2008 interest rate protection agreement on March 25, 2008; (2) received a payment of $9.9 million from the counterparties upon settlement of the 2010 interest rate protection agreements on February 4, 2011; and (3) made a payment of $65.5 million to the counterparty upon settlement of the 2011 interest rate protection agreement on June 26, 2012. The Company recorded the effective portion of the settlements in accumulated OCI, and these amounts were amortized over the terms of the respective notes.

During the fourth quarter of 2019, the Company recorded a charge of $13.1 million in interest expense from the write-off of the remaining treasury lock balance due to the redemption of the 3.90% notes on December 23, 2019. The Company has not entered into any new interest rate protection agreements subsequent to the fourth quarter 2019 write-off of the remaining treasury lock balance.

Derivative Instruments

The impact of derivative instruments on the consolidated statements of income and accumulated OCI was as follows (dollars in millions):

	Loss Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended December 31,
	2020		2019			2018
Amortization of treasury locks (included in interest    expense, net)	$	—	$	(18.2	)	$	(5.3	)

As a result of our November 2019 debt refinancing and redemption of the 3.90% notes due June 15, 2022, the Company accelerated the amortization of the remaining treasury lock balance of $13.1 million ($6.5 million after tax) during the fourth quarter of 2019. The after tax amount includes $3.2 million of income tax benefit from the stranded tax effects in accumulated OCI related to the write-off of the remaining treasury lock balance. 

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Stockholders' Equity

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Stockholders' Equity

16. Stockholders' Equity

Dividends

During the year ended December 31, 2020, we paid $299.6 million of dividends to shareholders. On December 10, 2020, PCA announced an increase of its quarterly cash dividend on its common stock from an annual rate of $3.16 per share to $4.00 per share. Also, on December 10, 2020, PCA's Board of Directors approved a regular quarterly cash dividend of $1.00 per share of common stock, which was paid on January 15, 2021 to shareholders of record as of December 21, 2020. The dividend payment was $94.8 million.

Share Repurchase Program

On February 25, 2016, PCA announced that its Board of Directors authorized the repurchase of $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.

The Company did not repurchase any shares of its common stock under this authority during the twelve months ended December 31, 2020 and 2019. All shares repurchased in prior years have been retired. At December 31, 2020, $193.0 million of the authorized amount remained available for repurchase of the Company's common stock.

Accumulated Other Comprehensive Income (Loss)

Changes in AOCI, net of taxes, by component follows (dollars in millions). Amounts in parentheses indicate losses.

	Foreign Currency Translation Adjustments			Unrealized Loss on Treasury Locks, Net			Unrealized Loss on Foreign Exchange Contracts			Unrealized Loss on Marketable Debt Securities		Unfunded Employee Benefit Obligations			Total
Balance at January 1, 2019	$	(0.4	)	$	(10.2	)	$	(0.3	)	$	—	$	(127.9	)	$	(138.8	)
Other comprehensive income before reclassifications		—			—			—			—		(40.5	)		(40.5	)
Amounts reclassified from AOCI		—			10.2			0.1			—		9.5			19.8
Net current-period other comprehensive income (loss)		—			10.2			0.1			—		(31.0	)		(20.7	)
Balance at December 31, 2019	$	(0.4	)	$	—		$	(0.2	)	$	—	$	(158.9	)	$	(159.5	)
Other comprehensive income before reclassifications		—			—			—			0.3		4.0			4.3
Amounts reclassified from AOCI		—			—			—			—		10.7			10.7
Net current-period other comprehensive income		—			—			—			0.3		14.7			15.0
Balance at December 31, 2020	$	(0.4	)	$	—		$	(0.2	)	$	0.3	$	(144.2	)	$	(144.5	)

The following table presents information about reclassifications out of AOCI (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income.

	Amounts Reclassified from AOCI Year Ended December 31,
Details about AOCI Components	2020			2019
Unrealized loss on treasury locks, net (a)	$	—		$	(18.1	)
		—			7.9		Tax benefit
	$	—		$	(10.2	)	Net of tax
Unfunded employee benefit obligations (b)
Amortization of prior service costs	$	(3.9	)	$	(6.0	)
Amortization of actuarial gains / (losses)		(10.4	)		(6.7	)
		(14.3	)		(12.7	)	Total before tax
		3.6			3.2		Tax benefit
	$	(10.7	)	$	(9.5	)	Net of tax

(a) For 2019, this AOCI component is included in interest expense, net. The amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The remaining balances of the treasury locks were written off as a result of the Company’s November 2019 debt refinancing. For a discussion of treasury lock derivative instrument activity, see Note 15, Derivative Instruments and Hedging Activities, for additional information.

(b) These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

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Concentrations of Risk

12 Months Ended

Dec. 31, 2020

Risks And Uncertainties [Abstract]

Concentration of Risk

17. 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 represented approximately 5% and 7% of our total Company sales for 2020 and 2019, respectively, and about 45% and 50% of our Paper segment sales revenue for those periods, respectively. At December 31, 2020 and 2019, we had $39.6 million and $76.2 million of accounts receivable due from Office Depot, respectively, which represents approximately 5% and 9% of our total Company receivables, respectively.

In 2020, sales to Office Depot represented about 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.

Labor

At December 31, 2020, we had approximately 15,200 employees and approximately 44% of these employees worked pursuant to collective bargaining agreements. Approximately 62% of our hourly employees are represented by unions. The majority of our unionized employees are represented by the United Steel Workers (USW), the International Brotherhood of Teamsters (IBT), the International Association of Machinists (IAM), and the Association of Western Pulp and Paper Workers (AWPPW). Approximately 11% of our employees work pursuant to collective bargaining agreements that will expire within the next twelve months.

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Transactions With Related Parties

12 Months Ended

Dec. 31, 2020

Related Party Transactions [Abstract]

Transactions With Related Parties

18. 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 non-inventory working capital items) on our Consolidated Balance Sheets were $2.5 million at December 31, 2020 and $3.9 million at December 31, 2019. For 2020, 2019, and 2018, we recorded $70.6 million, $81.7 million, and $83.1 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”.

Fiber purchases from related parties were $12.6 million for 2020 and $16.8 million for both 2019 and 2018. 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.

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Segment Information

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Segment Information

19. 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.

During the fourth quarter of 2020, due to an increase in demand for our corrugated products and as part of our assessment of a potential conversion to produce containerboard, we began producing high-performance, virgin kraft linerboard on the No. 3 machine at our Jackson, Alabama mill on a trial basis. Before October 2020, operating results for the Jackson mill were included in the Paper segment. Beginning in October 2020, operating results for the Jackson mill are included in both the Packaging and Paper segments.

During the second quarter of 2018, the Company discontinued the production of paper grades at the Wallula, Washington mill and converted the No. 3 machine at the mill to produce virgin kraft linerboard. Before May 2018, operating results for the Wallula mill were included in the Paper segment. After May 2018, operating results for the Wallula mill are primarily included in the Packaging segment.

Packaging. We manufacture and sell a wide variety of containerboard and corrugated packaging products, including conventional shipping containers used to protect and transport manufactured goods, multi-color boxes and displays with strong visual appeal that help to merchandise the packaged product in retail locations. In addition, we are a large producer of packaging for meat, fresh fruit and vegetables, processed food, beverages, and other industrial and consumer products.

Paper. We manufacture and sell a range of communication-based papers. Our papers can be manufactured as either commodity papers or specialty papers with specialized or custom features, such as colors, coatings, high brightness, or recycled content.

Corporate and Other. Our Corporate and Other segment includes corporate support staff services and related assets and liabilities, and foreign exchange gains and losses. This segment also includes transportation assets, such as rail cars and trucks, which we use to transport our products from some of our manufacturing sites and assets related to LTP. See Note 18, Transactions with Related Parties, for more information related to LTP. Sales in this segment relate primarily to LTP and our rail and truck business. We provide transportation services not only to our own facilities but also, on a limited basis, to third parties when geographic proximity and logistics are favorable. Rail cars and trucks are generally leased.

Each segments' profits and losses are measured on operating profits before interest expense, net and other and income taxes. For many of these allocated expenses, the related assets and liabilities remain in the Corporate and Other segment.

Segment sales to external customers by product line were as follows (dollars in millions):

	Year Ended December 31,
	2020		2019		2018
Packaging	$	5,919.5	$	5,932.2	$	5,938.5
Paper		674.8		964.3		1,002.0
Corporate and Other		63.9		67.8		74.1
	$	6,658.2	$	6,964.3	$	7,014.6

Sales to foreign unaffiliated customers during the years ended December 31, 2020, 2019, and 2018 were $318.7 million, $394.9 million, and $487.8 million, respectively. At December 31, 2020 and 2019, we did not have any significant long-lived assets held by foreign operations.

An analysis of operations by reportable segment is as follows (dollars in millions):

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2020	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,901.7	$	17.8		$	5,919.5		$	829.5		(a)	$	365.2	$	394.8	$	5,744.0
Paper		674.7		0.1			674.8			(20.0	)	(b)(c)		36.5		20.1		497.2
Corporate and Other		81.8		131.3			213.1			(85.6	)			8.3		6.3		1,192.0
Intersegment eliminations		—		(149.2	)		(149.2	)		—				—		—		—
	$	6,658.2	$	—		$	6,658.2			723.9			$	410.0	$	421.2	$	7,433.2
Non-operating pension income										2.3
Interest expense, net										(93.5	)
Income before taxes									$	632.7

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2019	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,905.1	$	27.1		$	5,932.2		$	963.4		(d)	$	342.8	$	367.4	$	5,491.5
Paper		964.3		—			964.3			175.4		(e)		37.7		23.8		791.4
Corporate and Other		94.9		133.1			228.0			(85.1	)			7.0		8.3		952.9
Intersegment eliminations		—		(160.2	)		(160.2	)		—				—		—		—
	$	6,964.3	$	—		$	6,964.3			1,053.7			$	387.5	$	399.5	$	7,235.8
Non-operating pension expense										(7.9	)
Interest expense, net										(128.8	)	(f)
Income before taxes									$	917.0

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2018	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,912.3	$	26.2		$	5,938.5		$	1,045.4		(g)	$	342.0	$	504.0	$	5,347.0
Paper		1,002.0		—			1,002.0			97.7		(h)		62.0		12.6		760.1
Corporate and Other		100.3		129.4			229.7			(75.4	)	(i)		6.9		34.8		462.6
Intersegment eliminations		—		(155.6	)		(155.6	)		—				—		—		—
	$	7,014.6	$	—		$	7,014.6			1,067.7			$	410.9	$	551.4	$	6,569.7
Non-operating pension expense										(2.1	)
Interest expense, net										(95.1	)
Income before taxes									$	970.5

(a)     Includes the following:

o $27.3 million of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility during the second quarter of 2020.

o $10.0 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.

o $6.3 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(b)     Includes the following:

o $0.8 million of restructuring costs for paper administrative functions.

o $0.6 million incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(c)     During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.

(d)     Includes the following:

o $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

o $0.8 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

o $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility.

(e)     Includes $0.2 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side           white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(f)     Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs.

(g)     Includes the following:

o $12.3 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

o $1.6 million of charges consisting of closure costs related to corrugated products facilities.

o $0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities.

o $0.2 million of charges for acquisition and integration costs related to recent acquisitions.

(h)     Includes $17.7 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(i)     Includes $0.2 million of charges consisting of closure costs related to a corporate administration facility.

(j)     Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisitions of businesses, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.

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Commitments, Guarantees, Indemnifications, and Legal Proceedings

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments, Guarantees, Indemnifications, and Legal Proceedings

20. 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 (discussed in Note 10, Debt), lease obligations (discussed in Note 3, Leases), capital commitments, purchase commitments for goods and services, and legal proceedings (discussed below).

Capital Commitments

The Company had capital commitments of approximately $304.2 million and $212.6 million as of December 31, 2020 and 2019, respectively, in connection with the expansion and replacement of existing facilities and equipment.

Purchase Commitments

In the table below, we set forth our enforceable and legally binding purchase obligations as of December 31, 2020. Some of the amounts are based on management's estimates and assumptions about these obligations, including their duration, the possibility of renewal, anticipated actions by third parties, and other factors. Because these estimates and assumptions are necessarily subjective, our actual payments may vary from those reflected in the table. Purchase orders made in the ordinary

course of business are excluded below. Any amounts for which we are liable under purchase orders are reflected on the Consolidated Balance Sheets as accounts payable and accrued liabilities. These obligations relate to various purchase agreements for items such as minimum amounts of energy and fiber purchases over periods ranging from one year to 31 years. Total purchase commitments were as follows (dollars in millions):

2021	$	53.5
2022		48.2
2023		48.0
2024		27.3
2025		26.8
Thereafter		79.8
Total	$	283.6

The Company purchased a total of $317.6 million, $315.0 million, and $341.9 million during the years ended December 31, 2020, 2019, and 2018, respectively, under these purchase agreements.

Environmental Matters

On August 8, 2019, the EPA issued a notice of violation (NOV) alleging violations of the Clean Air Act, resulting from an inspection at our Wallula, Washington mill in September 2018. PCA denies the violations set forth in the NOV and has requested that the EPA’s Office of Air Quality Planning and Standards provide an applicability determination to clarify that the relevant operations of PCA have not violated the regulations at issue in the NOV. The EPA denied our request in 2020. We intend to vigorously defend any enforcement action and, on July 27, 2020, filed a petition with the EPA to reconsider its denial of our applicability determination and filed petitions in U.S. federal court to review the agency’s denial of our applicability determination as well as the rule at issue. While we cannot predict with certainty the ultimate resolution of this matter, we believe that we have a meritorious position that our operations have not violated the Clean Air Act, that we have taken appropriate action to address the matters raised by the EPA in the NOV, and that this matter will not result in a material adverse effect on our financial condition, results of operations, or cash flows.

The potential costs for various environmental matters are uncertain due to such factors as the unknown magnitude of possible cleanup costs, the complexity and evolving nature of governmental laws and regulations and their interpretations, and the timing, varying costs and effectiveness of alternative cleanup technologies. From 2006 through 2020, there were no significant environmental remediation costs at PCA's mills and corrugated plants. At December 31, 2020, the Company had $23.6 million of environmental-related reserves recorded on its Consolidated Balance Sheet. Of the $23.6 million, approximately $15.5 million related to environmental-related asset retirement obligations discussed in Note 13, Asset Retirement Obligations, and $8.1 million related to our estimate of other environmental contingencies. The Company recorded $4.6 million in “Accrued liabilities” and $19.0 million in “Other long-term liabilities” on the Consolidated Balance Sheet. Liabilities recorded for environmental contingencies are estimates of the probable costs based upon available information and assumptions. Because of these uncertainties, PCA’s estimates may change. The Company believes that it is not reasonably possible that future environmental expenditures for remediation costs and asset retirement obligations above the $23.6 million accrued as of December 31, 2020 will have a material impact on its financial condition, results of operations, or cash flows.

Guarantees and Indemnifications

We provide guarantees, indemnifications, and other assurances to third parties in the normal course of our business. These include tort indemnifications, environmental assurances, and representations and warranties in commercial agreements. At December 31, 2020, 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.

DeRidder Mill Incident

On February 8, 2017, a tank located in the pulp mill at the Company's DeRidder, Louisiana facility exploded, resulting in three contractor fatalities and other injuries. The Company has been served with multiple lawsuits involving the decedents and other allegedly injured parties, alleging negligence on the part of the Company and claiming compensatory and punitive damages. The Company is vigorously defending these lawsuits. The Company believes that these suits are covered by its liability insurance policies, subject to an aggregate $1.0 million deductible, which has been satisfied in full as a result of settlement of various lawsuits and fees and expenses incurred by the Company. All pending lawsuits are in the early stages. Accordingly, the Company is unable to estimate a range of reasonable possible losses at this time.

The Company has cooperated with investigations from the U.S. Occupational Health and Safety Administration (OSHA), the U.S. Chemical Safety Board (CSB) and the U.S. Environmental Protection Agency (EPA). The U.S. Chemical Safety Board completed its investigation and issued its report during the second quarter of 2018. The Company settled with OSHA during the second quarter of 2018 and paid approximately $40,000 in penalties for citations.

The EPA investigation is ongoing. In May 2017, the U.S. Environmental Protection Agency (EPA) conducted an on-site inspection of the facility to assess compliance with the Clean Air Act, Risk Management Program (RMP). The Company provided additional information to the EPA promptly after the inspection to address certain areas of concern (AOCs) observed during the inspection. In January 2021, the EPA and U.S. Department of Justice (DOJ) initiated civil judicial enforcement discussions with PCA. These discussions are ongoing. As of the date of filing of this report, no complaint has been filed. PCA continues to cooperate with the agencies. Since the inspection in 2017, PCA performed several voluntary activities to address the AOCs presented in the EPA’s inspection report and has removed the RMP covered process from the facility.

Legal Proceedings

We are also a party to various legal actions arising in the ordinary course of our business. These legal actions include commercial liability claims, premises liability claims, 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.

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Quarterly Results of Operations (Unaudited)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations (Unaudited)

21. Quarterly Results of Operations (unaudited, dollars in millions, except per-share and stock price information)

2020:	First (a)		Second (b)		Third (c)		Fourth (d)		Total
Net sales	$	1,708.7	$	1,541.6	$	1,693.7	$	1,714.2	$	6,658.2
Gross profit		365.0		325.8		345.4		333.3		1,369.4
Income from operations		209.1		116.1		209.5		189.3		723.9
Net income		141.7		56.7		139.1		123.5		461.0
Basic earnings per share		1.50		0.60		1.47		1.30		4.86
Diluted earnings per share		1.49		0.59		1.46		1.30		4.84
Stock price - high		112.89		112.80		114.32		138.95		138.95
Stock price - low		71.05		80.17		92.02		106.08		71.05

2019:	First (e)		Second		Third (f)		Fourth (g)		Total
Net sales	$	1,733.7	$	1,759.9	$	1,750.7	$	1,720.0	$	6,964.3
Gross profit		421.4		427.9		411.4		383.3		1,644.0
Income from operations		275.4		280.4		262.8		235.1		1,053.7
Net income		186.8		193.6		179.8		136.2		696.4
Basic earnings per share		1.98		2.05		1.90		1.44		7.36
Diluted earnings per share		1.97		2.04		1.89		1.43		7.34
Stock price - high		101.84		103.80		109.37		114.78		114.78
Stock price - low		81.87		87.85		96.30		100.54		81.87

Note: The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in the weighted average shares outstanding throughout the year.

(a) Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

(b) Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

(c) Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

(d) Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

(e) Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

(f) Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

(g) Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. We adjust such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates will be reflected in the consolidated financial statements in future periods.

Revenue Recognition

Revenue Recognition

In accordance with ASU 2014-09 (Topic 606): Revenue from Contracts with Customers, we recognize revenue when control of the promised goods or services is transferred to customers in an amount that reflects the consideration expected to be received in exchange for those goods or services. The timing of revenue recognition for most goods and services occurs when performance obligations under the terms of a contract with a customer are satisfied. This occurs with the transfer of control of our products at a specific point in time. For most packaging and paper products, revenue is recognized when the product is shipped from the mill or from our manufacturing facility to our customer. Shipping and handling fees billed to a customer are recorded on a gross basis in “Net sales”, with the corresponding shipping and handling costs included in “Cost of sales” in the concurrent period as the revenue is recorded. We present taxes collected from customers and remitted to governmental authorities on a net basis in our Consolidated Statements of Income. See Note 4, Revenue, for more information.

Planned Major Maintenance Costs

Planned Major Maintenance Costs

The Company accounts for its planned major maintenance activities in accordance with ASC 360, Property, Plant, and Equipment, using the deferral method. All maintenance costs incurred during the year are expensed in the year in which the maintenance activity occurs.

Share-Based Compensation

Share-Based Compensation

We recognize compensation expense for awards granted under the PCA long-term equity incentive plans based on the fair value on the grant date. We recognize the cost of the equity awards expected to vest over the period the awards vest. See Note 14, Share-Based Compensation, for more information.

Research and Development

Research and Development

Research and development costs are expensed as incurred. The amount charged to expense was $15.5 million, $16.0 million, and $14.4 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include all cash balances and highly liquid investments with original maturities of three months or less at the date of purchase. Cash equivalents are stated at cost, which approximates market. Cash and cash equivalents totaled $974.6 million and $679.5 million at December 31, 2020 and 2019, respectively, which included cash equivalents of $662.2 million and $410.7 million, respectively. At December 31, 2020 and 2019, we had $2.2 million and $2.4 million, respectively, of cash at our operations outside the United States.

Marketable Debt Securities

Marketable Debt Securities

The Company’s marketable debt securities have been classified and accounted for as available-for-sale (AFS) marketable debt securities in accordance with ASU 2016-13, Financial Instruments – Credit Losses (Topic 326). The Company reports its marketable debt securities at fair value, and they are classified as short-term or long-term based on each security’s underlying contractual maturity date.

The Company’s marketable debt securities are analyzed at the individual debt security level. Changes in the fair value of the debt security have the potential to impact accumulated other comprehensive income (loss) (AOCI), the Company’s earnings, or both.

The Company regularly reviews its investment portfolio to determine if any debt security is impaired. A decline in the fair value of the debt security below its amortized cost results in an impairment of the debt security. If there is an intent to sell the debt security, or if it is more likely than not that the debt security will be sold prior to recovering the amortized cost basis, the Company recognizes the impairment as a realized loss in earnings by writing down the debt security’s amortized cost basis.

Additional analysis is required if there is not an intent to sell the debt security, or if a recovery of the amortized cost basis is expected to be made prior to the sale of the security. If any portion of the impairment is the result of a credit loss, the Company recognizes this portion in earnings through an allowance for credit losses, with the remainder recognized as unrealized loss in AOCI. Subsequent improvements in credit losses are recognized as a reduction in the allowance. Any impairment not attributed to credit loss is recognized as an unrealized loss in AOCI in its entirety.

The Company considers several factors when determining if a portion of an impairment is the result of a credit loss including, but not limited to, adverse conditions related to the financial health and future outlook of the issuer; the credit quality of the issuer, as reported by credit rating agencies; trends present in the issuer’s industry in which it operates; and general market conditions.

For the year ended December 31, 2020, we do not consider any of the impairments related to our marketable debt securities to be the result of credit losses. We recorded no other-than-temporary impairment charges on our AFS securities for the year ended December 31, 2019 under prior year guidance ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 11, Cash, Cash Equivalents, and Marketable Debt Securities, for more information.

Trade Accounts Receivable, Allowance for Doubtful Accounts, and Customer Deductions

Trade Accounts Receivable, Allowances, and Customer Deductions

Trade accounts receivable are recorded at amortized cost and represent a contractual right to receive payment from a customer. The Company’s trade accounts receivable are short-term receivables, with most requiring payment within 30 to 60 days, and represent the only class of financing receivables utilized by the Company. As of December 31, 2020, we do not expect the effect of the COVID-19 pandemic to have a material impact on our ability to collect on our outstanding trade accounts receivable.

In accordance with ASU 2016-13, Financial Instruments – Credit Losses (Topic 326), the Company established an allowance for credit losses, which is a valuation account that estimates the expected credit loss over the lifetime of the asset and is deducted from, or added to, the amortized cost basis of the trade accounts receivable. The allowance for credit losses is based upon a combination of factors such as historical collection experience, aged receivables, current economic conditions, and reasonable and supportable forecasts on future economic conditions. Expected recoveries of amounts previously written off, not to exceed the aggregate of the amount previously written off, are also considered when determining the necessary allowance at the balance sheet date. When determining the allowance for credit losses, management also considers specific customer accounts that may be considered higher risk or uncollectible due to customer industry trends, bankruptcy filings, or substantial downgrades of credit scores.

Current period estimates for the allowance for credit losses are compared against the allowance previously recorded, and all required adjustments are reported as credit loss expense (for expected losses or write offs) or a reversal of credit loss expense (for expected recoveries) in net income. Outstanding trade accounts receivable balances are written off when deemed uncollectible after undergoing reasonable collection efforts. At December 31, 2020, the allowance for credit losses was $3.0 million, and at December 31, 2019, the allowance for doubtful accounts was $4.2 million.

The customer deductions reserve represents the estimated amount required for customer returns, allowances, and earned discounts. Based on the Company’s experience, customer returns, allowances, and earned discounts have averaged approximately 1% of gross selling price. Accordingly, PCA reserves 1% of its open customer accounts receivable balance for these items. The reserves for customer deductions of $7.6 million and $8.4 million at December 31, 2020 and 2019, respectively, are also included as a reduction of the accounts receivable balance.

Derivative Instruments and Hedging Activities

Derivative Instruments and Hedging Activities

The Company records its derivatives, if any, in accordance with ASC 815, Derivatives and Hedging. The guidance requires the Company to recognize derivative instruments as either assets or liabilities on the balance sheet at fair value. The accounting for changes in the fair value of a derivative depends on the intended use and designation of the derivative instrument. For a derivative designated as a fair value hedge, the gain or loss on the derivative is recognized in earnings in the period of change at fair value together with the offsetting gain or loss on the hedged item. For a derivative instrument designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially reported as a component of AOCI and is subsequently recognized in earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is recognized in earnings. We were not party to any derivative-based arrangements at December 31, 2020 and 2019.

Fair Value Measurements

Fair Value Measurements

PCA measures the fair value of its financial instruments and marketable debt securities in accordance with ASC 820, Fair Value Measurements and Disclosures. The guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. It is determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes the following hierarchy that prioritizes the inputs to valuation methodologies used to measure fair value:

Level 1 — Valuations based on quoted prices for identical assets and liabilities in active markets.

Level 2 — Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

Level 3 — Valuations based on unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets that are measured at fair value using the net asset value (NAV) per share as a practical expedient are not categorized within the fair value hierarchy.

Financial instruments and marketable debt securities measured at fair value on a recurring basis include the fair values of our marketable debt securities and our pension and postretirement benefit assets and liabilities. The valuation techniques used to measure the fair value of the Company’s marketable debt securities and pension and postretirement benefit assets and liabilities, which generally have counterparties with high credit ratings, are based on quoted market prices or model-driven valuations using significant inputs derived from or corroborated by observable market data. See Note 11, Cash, Cash Equivalents, and Marketable Debt Securities, and Note 12, Employee Benefit Plans and Other Postretirement Benefits, for more information.

Other assets and liabilities measured and recognized at fair value on a nonrecurring basis include assets acquired and liabilities assumed in acquisitions and our asset retirement obligations. Given the nature of these assets and liabilities, evaluating their fair value from the perspective of a market participant is inherently complex. Assumptions and estimates about future values can be affected by a variety of internal and external factors. Changes in these factors may require us to revise our estimates and could require us to retroactively adjust provisional amounts that we recorded for the fair values of assets acquired and liabilities assumed in connection with business combinations. These adjustments could have a material effect on our financial condition and results of operations. See Note 13, Asset Retirement Obligations, for more information.

Inventory Valuation

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.

The components of inventories were as follows (dollars in millions):

	December 31,
	2020		2019
Raw materials	$	263.5	$	271.5
Work in process		11.6		11.0
Finished goods		183.6		207.7
Supplies and materials		329.2		303.9
Inventories	$	787.9	$	794.1

Property, Plant, and Equipment

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost. Cost includes expenditures for major improvements and replacements and the amount of interest cost associated with significant capital additions. Repairs and maintenance costs are expensed as incurred. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in “Net income” in our Consolidated Statements of Income.

Depreciation and Useful Life

Depreciation is computed on the straight-line basis over the estimated useful lives of the related assets. Assets under finance leases are depreciated on the straight-line method over the term of the lease or the useful life, if shorter. The following lives are used for the various categories of assets:

Buildings and land improvements	5 to 40 years
Machinery and equipment	3 to 25 years
Trucks and automobiles	3 to 10 years
Furniture and fixtures	3 to 20 years
Computers and hardware	3 to 10 years
Leasehold improvements	Period of the lease or useful life, if shorter

Leases

Leases

We determine if an arrangement is, or contains, a lease at the inception date based on the presence of identified assets and our right to obtain substantially all of the economic benefit from or to direct the use of such assets. When we determine a lease exists, we record a right-of-use asset and corresponding lease liability on our consolidated balance sheets. Right-of-use assets represent our right to use an underlying asset for the lease term. Lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets are recognized at commencement date at the value of the lease liability and are adjusted for any prepayments, lease incentives received, and initial direct costs incurred. Lease liabilities are recognized at lease commencement date based on the present value of remaining lease payments over the lease term. As the discount rate implicit in the lease is not readily determinable in most of our leases, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

Operating lease balances are included in Operating lease right-of-use assets with the related liabilities included in Current Operating lease obligations and Long-term Operating lease obligations. Assets under finance leases are included in Property, plant and equipment, net, with the related liabilities included in Current Finance lease obligations and Long-term Finance lease obligations.

We do not record lease contracts with a term of 12 months or less on our consolidated balance sheets.

We recognize fixed lease expense for operating leases on a straight-line basis over the lease term. For finance leases, we recognize amortization expense on the right-of-use asset and interest expense on the lease liability over the lease term.

We have lease agreements with non-lease components that relate to lease components (e.g., common area maintenance such as cleaning or landscaping, insurance, etc.). We account for each lease and any non-lease components associated with that lease as a single lease component for all underlying asset classes. Accordingly, all costs associated with a lease contract are accounted for as lease costs.

Long-Lived Asset Impairment

Long-Lived Asset Impairment

Long-lived assets other than goodwill and other intangibles are reviewed for impairment in accordance with provisions of ASC 360, Property, Plant and Equipment. In the event that facts and circumstances indicate that the carrying amount of any long-lived assets may be impaired, an evaluation of recoverability is performed. If an evaluation is required, the estimated

future undiscounted cash flows associated with the asset (or group of assets) is compared to the assets (or group of assets) carrying amount to determine if a write-down to fair value is required.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of our long-lived assets within our Paper reporting unit, including property, plant, and equipment, and performed a recoverability test on the Paper reporting unit long-lived assets as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long-lived assets within our Paper segment, inclusive of property, plant, and equipment, were 100% recoverable.

Goodwill and Intangible Assets

Goodwill and Intangible Assets

The Company has capitalized certain intangible assets, primarily goodwill, customer relationships, and trademarks and trade names, based on their estimated fair value at the date of acquisition. Amortization is provided for customer relationships on a straight-line basis over periods ranging from ten to 40 years, and trademarks and trade names over periods ranging from five to 20 years.

Goodwill, which amounted to $863.5 million and $918.7 million for the years ended December 31, 2020 and 2019, respectively, is not amortized but is subject to an annual impairment test in accordance with ASC 350, Intangibles – Goodwill and Other. We test goodwill for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. Additionally, we evaluate the remaining useful lives of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives are necessary.

During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit and performed an interim quantitative impairment analysis as of May 31, 2020. Based on the evaluation performed, we determined that the carrying value of the Paper reporting unit exceeded its fair value, which resulted in a goodwill impairment charge totaling $55.2 million.

The Company concluded that none of the goodwill or intangible assets were impaired in the 2020, 2019, and 2018 annual impairment tests. See Note 8, Goodwill and Intangible Assets, for additional information.

Pension and Postretirement Benefits

Pension and Postretirement Benefits

Several estimates and assumptions are required to record pension costs and liabilities, including discount rate, return on assets, and longevity and service lives of employees. We review and update these assumptions annually unless a plan curtailment or other event occurs, requiring that we update the estimates on an interim basis. While we believe the assumptions used to measure our pension and postretirement benefit obligations are reasonable, differences in actual experience or changes in assumptions may materially affect our pension and postretirement benefit obligations and future expense. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

For postretirement health care plan accounting, the Company reviews external data and its own historical trends for health care costs to determine the health care cost trend rate assumption.  

Environmental Matters

Environmental Matters

Environmental expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities are recorded for environmental contingencies when such costs are probable and reasonably estimable. These liabilities are adjusted as further information develops or circumstances change. Environmental expenditures related to existing conditions resulting from past or current operations from which no current or future benefit is discernible are expensed as incurred.

Asset Retirement Obligations

Asset Retirement Obligations

The Company accounts for its retirement obligations related predominantly to landfill closure, wastewater treatment pond dredging, closed-site monitoring costs, and certain leasehold improvements under ASC 410, Asset Retirement and Environmental Obligations, which requires recognition of legal obligations associated with the retirement of long-lived assets whether these assets are owned or leased. These legal obligations are recognized at fair value at the time that the obligations are

incurred. When we record the liability, we capitalize the cost by increasing the carrying amount of the related long-lived asset, which is amortized to expense over the useful life of the asset. See Note 13, Asset Retirement Obligations, for additional information.

Deferred Debt Issuance Costs

Deferred Debt Issuance Costs

PCA has capitalized certain costs related to obtaining its financing. These costs are amortized to interest expense using the effective interest rate method over the terms of the related financing, which range from 10 to 30 years. At December 31, 2020 and 2019, deferred debt issuance costs were $14.3 million and $16.3 million, respectively, and were recorded in “Long-Term Debt” on our Consolidated Balance Sheets.

Cutting Rights and Fiber Farms

Cutting Rights and Fiber Farms

We lease the cutting rights to approximately 71,000 acres of timberland. For our cutting rights, we capitalize the annual lease payments and reforestation costs associated with these leases. Costs are recorded as depletion when the timber or fiber is harvested and used in operations or sold to customers. Capitalized long-term lease costs for our cutting rights, primarily recorded in “Other long-term assets” on our Consolidated Balance Sheets, were $20.3 million and $21.6 million as of December 31, 2020 and 2019, respectively. The amount of depletion expense was $3.1 million, $2.7 million, and $7.6 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Deferred Software Costs

Deferred Software Costs

PCA capitalizes costs related to the purchase and development of software, which is used in its business operations. The costs attributable to these software systems are amortized over their estimated useful lives based on various factors such as the effects of obsolescence, technology, and other economic factors. Net capitalized software costs recorded in “Other long-term assets” on our Consolidated Balance Sheets were $4.8 million and $1.4 million for the years ended December 31, 2020 and 2019, respectively. Software amortization expense was $1.1 million, $0.9 million, and $2.1 million for the years ended December 31, 2020, 2019, and 2018, respectively.

During 2019, the Company early adopted ASU 2018-15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which includes amendments to align the accounting for costs incurred to implement a cloud computing arrangement that is a service contract with the guidance on capitalizing costs associated with developing or obtaining internal-use software. As of December 31, 2020, capitalized costs associated with cloud computing arrangements were $4.0 million. These costs were immaterial as of December 31, 2019.

Income Taxes

Income Taxes

PCA utilizes the liability method of accounting for income taxes whereby it recognizes deferred tax assets and liabilities for the future tax consequences of temporary differences between the tax basis of assets and liabilities and the reported amounts in the financial statements. Deferred tax assets will be reduced by a valuation allowance if, based upon management’s estimates, it is more likely than not that a portion of the deferred tax assets will not be realized in a future period. The estimates utilized in the recognition of deferred tax assets are subject to revision in future periods based on new facts or circumstances. PCA’s practice is to recognize interest and penalties related to unrecognized tax benefits in income tax expense.

Trade Agreements

Trade Agreements

PCA regularly trades containerboard with other manufacturers primarily to reduce shipping costs. These agreements are entered into with other producers on an annual basis, pursuant to which both parties agree to ship an identical number of tons of containerboard to each other within the agreement period. These agreements lower transportation costs by allowing each party’s containerboard mills to ship containerboard to the other party’s closer corrugated products plant. PCA tracks each shipment to ensure that the other party’s shipments to PCA match PCA’s shipments to the other party during the agreement period. Such transfers are possible because certain grades of containerboard are commodity products with no distinguishing product characteristics. These transactions are accounted for at carrying value, and revenue is not recorded as the transactions do not represent the culmination of an earnings process. The transactions are recorded into inventory accounts, and no sale or income is recorded until such inventory is converted to a finished product and sold to an end-use customer.

Business Combinations

The Company accounts for acquisitions under ASC 805, Business Combinations and ASU 2017-01 (Topic 805): Clarifying the Definition of a Business. ASC 805 requires separate recognition of assets acquired and liabilities assumed from goodwill at the acquisition date fair values. ASU 2017-01 (Topic 805) provides additional guidance to assist entities with evaluating whether transfers of assets and activities should be accounted for as acquisitions of assets or businesses. Goodwill as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date fair values of the assets acquired and liabilities assumed. During the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated financial statements.

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards

Effective January 1, 2020, we adopted Accounting Standards Update (“ASU”) 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 introduces the Current Expected Credit Losses (“CECL”) framework for evaluating credit losses on financial instruments measured at amortized cost. ASU 2016-13 was applied using the modified retrospective method, and as a result, amounts recorded prior to January 1, 2020 have not been retrospectively restated. This new framework requires entities to incorporate forward-looking information into their estimate of current expected credit loss as of each reporting date. Although available-for-sale (“AFS”) debt securities are not within the scope of the new CECL framework, the ASU includes an amended impairment model for evaluating losses related to AFS debt securities. The guidance in this update also includes enhanced requirements for disclosures related to credit loss estimates.

Prior to adoption of the new standard, the Company already incorporated forward-looking information into its estimate of credit losses for trade receivables. Due to the short duration of the Company’s trade receivables, the adoption of ASU 2016-13 did not have a material impact on trade receivables. The adoption of ASU 2016-13 also did not have a material impact on the Company’s AFS marketable debt securities, as the Company only invests in highly-rated AFS marketable debt securities. Overall, the adoption of ASU 2016-13 did not have a material impact on the Company’s financial condition, results of operations or cash flow.

Effective January 1, 2020, the Company adopted ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 removes or modifies certain disclosure requirements and adds additional requirements to improve the usefulness of the fair value measurement disclosure for financial statement users. Certain new requirements of ASU 2018-13 are required to be applied prospectively for the first interim period of the initial year of adoption. However, the modifications and removal of certain information needs to be applied retrospectively. The adoption of this Update did not have a significant impact on the Company’s related disclosures as reflected in this Annual Report on Form 10-K.

Effective for the annual period ended December 31, 2020, the Company adopted ASU 2018-14, Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans. ASU 2018-14 removes certain disclosures that are not considered cost beneficial, clarifies certain required disclosures, and adds additional disclosures. The amendments in this ASU were applied retrospectively in this Annual Report on Form 10-K and did not have a significant impact on the disclosures for our defined pension benefit plans and other postretirement benefits.

Effective January 1, 2019, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02 (Topic 842): Leases, which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The original guidance required application on a modified retrospective basis with the earliest period presented. In July 2018, the FASB issued ASU 2018-11, Targeted Improvements to ASC 842, which included an option to not restate comparative periods in transition and elect to use the effective date of ASC 842, Leases, as the date of initial application of transition, which we elected. As a result of the adoption of ASC 842 on January 1, 2019, we recorded operating lease liabilities of $228 million, with corresponding right-of-use assets of the same amount. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed us to carry forward the historical lease classification and not to reassess whether existing or expired contracts contain a lease. We also elected the short-term lease recognition exemption, which permits us to exclude short-term leases (i.e. leases with terms of 12 months or less) from the recognition requirements of this standard, and we elected to account for lease and non-lease components as a single lease component for all classes of underlying assets except for embedded leases. The adoption of ASC 842 had an immaterial impact on our consolidated net earnings, liquidity and debt covenants under our current agreements for the year ended December 31, 2019. See Note 3, Leases, for more information.

New Accounting Standards Not Yet Adopted

New Accounting Standards Not Yet Adopted

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting. The amendments in this Update are elective and apply to all entities, subject to meeting certain criteria, that have contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Companies can apply the ASU immediately, but the guidance will only be available until December 31, 2022. The Company is currently evaluating the impact of this guidance, but does not expect the guidance to have a significant impact on its related disclosures.

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.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Components of Inventories

The components of inventories were as follows (dollars in millions):

	December 31,
	2020		2019
Raw materials	$	263.5	$	271.5
Work in process		11.6		11.0
Finished goods		183.6		207.7
Supplies and materials		329.2		303.9
Inventories	$	787.9	$	794.1

Property, Plant and Equipment (at cost)

Property, plant, and equipment consisted of the following (dollars in millions):

	December 31,
	2020			2019
Land and land improvements	$	179.6		$	177.5
Buildings		858.5			837.4
Machinery and equipment		5,826.6			5,727.4
Construction in progress		360.0			174.0
Other		88.8			81.5
Property, plant and equipment, at cost		7,313.5			6,997.8
Less accumulated depreciation		(4,120.1	)		(3,846.1	)
Property, plant and equipment, net	$	3,193.4		$	3,151.7

Property, Plant and Equipment Estimated Useful Lives

Depreciation is computed on the straight-line basis over the estimated useful lives of the related assets. Assets under finance leases are depreciated on the straight-line method over the term of the lease or the useful life, if shorter. The following lives are used for the various categories of assets:

Buildings and land improvements	5 to 40 years
Machinery and equipment	3 to 25 years
Trucks and automobiles	3 to 10 years
Furniture and fixtures	3 to 20 years
Computers and hardware	3 to 10 years
Leasehold improvements	Period of the lease or useful life, if shorter

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Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Schedule of Supplemental Balance Sheet Information Related to Operating Leases

Supplemental balance sheet information related to our operating leases was as follows (dollars in millions):

	Year Ended December 31,
	2020		2019
Operating lease right-of-use assets	$	234.2	$	234.3
Current portion of operating lease obligations	$	68.9	$	62.6
Long-term portion of operating lease obligations		173.6		177.6
Total operating lease obligations	$	242.5	$	240.2

Schedule of Supplemental Balance Sheet Information Related to Finance Leases

Supplemental balance sheet information related to our finance leases was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019
Buildings	$	0.3		$	0.3
Machinery and equipment		28.5			28.5
Total		28.8			28.8
Less accumulated amortization		(19.6	)		(18.1	)
Total	$	9.2		$	10.7
Current portion of finance lease obligations	$	1.6		$	1.5
Long-term portion of finance lease obligations		14.4			16.0
Total finance lease obligations	$	16.0		$	17.5

Schedule of Weighted Average Remaining Lease Term and Weighted Average Discount Rates for Leases

For both operating and finance leases, the weighted average remaining lease term in years and weighted average discount rates were as follows:

	Year Ended December 31,
	2020		2019
Weighted-average remaining lease term (years):
Operating leases		5.3		5.6
Finance leases		7.8		8.8
Weighted-average discount rate:
Operating leases	3.79%		4.23%
Finance leases	6.66%		6.66%

Components of Lease Expense

The components of lease expense were as follows (dollars in millions):

	Year Ended December 31,
	2020		2019
Finance lease cost:
Amortization of finance lease assets	$	1.5	$	1.5
Interest on lease liabilities		1.1		1.2
Total finance lease cost		2.6		2.7
Operating lease cost		74.4		70.2
Short-term lease cost		18.0		19.2
Variable lease cost		12.9		13.7
Total lease cost	$	107.9	$	105.8

Schedule of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	(68.2	)	$	(60.0	)
Operating cash flows for finance leases		(1.5	)		(1.5	)
Financing cash flows for finance leases		(1.1	)		(1.2	)
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	$	(35.7	)	$	(27.7	)
Finance leases		—			—
Supplemental non-cash information on changes in lease liabilities	$	34.8		$	44.5
Supplemental non-cash information on changes in right-of-use assets	$	35.8		$	21.4

Schedule of Future Minimum Payments Under Operating and Finance Lease Liabilities

The future minimum payments under operating and finance lease liabilities at December 31, 2020 were as follows (dollars in millions):

	Operating Leases			Finance Leases
2021	$	76.7		$	2.7
2022		58.9			2.7
2023		42.3			2.7
2024		30.3			2.7
2025		21.1			2.7
Thereafter		40.4			7.0
Total lease payments		269.7			20.5
Less imputed interest (a)		(27.2	)		(4.5	)
Present value of lease liabilities	$	242.5		$	16.0

(a) Calculated using the incremental borrowing rate for each lease applied to the future payments.

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Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

Summary of Revenues Disaggregated by Product Line

The following table presents our revenues disaggregated by product line (dollars in millions):

	Year Ended December 31,
	2020		2019		2018
Packaging	$	5,919.5	$	5,932.2	$	5,938.5
Paper		674.8		964.3		1,002.0
Corporate and Other		63.9		67.8		74.1
Total revenue	$	6,658.2	$	6,964.3	$	7,014.6

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

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).

	Year Ended December 31,
		2020			2019			2018
Numerator:
Net income	$	461.0		$	696.4		$	738.0
Less: distributed and undistributed earnings allocated    to participating securities		(3.6	)		(5.2	)		(5.7	)
Net income attributable to common stockholders	$	457.4		$	691.2		$	732.3
Denominator:
Weighted average common shares outstanding		94.1			93.8			93.7
Effect of dilutive securities		0.3			0.3			0.2
Diluted common shares outstanding		94.4			94.1			93.9
Basic income per common share	$	4.86		$	7.36		$	7.82
Diluted income per common share	$	4.84		$	7.34		$	7.80

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Disclosure - Other Expense, Net (Tables)

12 Months Ended

Dec. 31, 2020

Other Income And Expenses [Abstract]

Components of Other Expense, Net

The components of other expense, net, were as follows (dollars in millions):

	Year Ended December 31,
	2020			2019			2018
Asset disposals and write-offs (a)	$	(26.5	)	$	(25.0	)	$	(17.3	)
Facilities closure and other costs (b)		(19.1	)		(0.3	)		(1.6	)
Wallula mill restructuring (c)		—			(0.7	)		(14.9	)
Insurance deductible for property damage (d)		—			—			(0.5	)
Acquisition and integration related costs (e)		—			—			(0.2	)
Other		(5.1	)		(6.7	)		(6.7	)
Total	$	(50.7	)	$	(32.7	)	$	(41.2	)

(a) For 2019, includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

(b) For 2020, includes charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a closed corrugated products facility during the second quarter of 2020. For 2019, includes charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility. For 2018, includes charges consisting of closure costs related to corrugated products facilities.

(c) Includes charges related to the discontinuation of production of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill in the second quarter of 2018 and the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(d) Includes charges for the property damage insurance deductible for a weather-related incident at one of our corrugated products facilities.

(e) Includes charges for acquisition and integration costs related to recent acquisitions.

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components of Consolidated Income Tax Provision

The following is an analysis of the components of the consolidated income tax provision (dollars in millions):

	Year Ended December 31,
	2020			2019		2018
Current income tax provision -
U.S. federal	$	109.4		$	123.2	$	150.7
State and local		27.5			37.0		42.9
Foreign		0.1			0.1		0.2
Total current provision for taxes		137.0			160.3		193.8
Deferred income tax provision (benefit) -
U.S. federal		26.8			55.3		34.7
State and local		8.0			5.0		4.0
Foreign		(0.1	)		—		—
Total deferred provision (benefit) for taxes		34.7			60.3		38.7
Total provision for taxes	$	171.7		$	220.6	$	232.5

Summary of Effective Tax Rate

The effective tax rate varies from the U.S. federal statutory tax rate principally due to the following (dollars in millions):

	2020			2019			2018
Provision computed at U.S. federal statutory rate of 21%	$	132.9		$	192.6		$	203.8
Federal tax reform		—			—			(2.0	)
State and local taxes, net of federal benefit		28.4			35.7			36.9
Goodwill impairment (a)		11.6			—			—
Other		(1.2	)		(7.7	)		(6.2	)
Total	$	171.7		$	220.6		$	232.5

(a) For additional information regarding the impairment of goodwill within our Paper reporting unit, see Note 8, Goodwill and Intangible Assets.

Details of Scheduled Expiration Dates of Tax Effected Net Operating Loss (NOL) and Other Tax Carryforwards

The following details the scheduled expiration dates of our tax effected net operating loss (NOL) and other tax carryforwards at December 31, 2020 (dollars in millions):

	2021 Through 2030		2031 Through 2040		Indefinite		Total
U.S. federal NOLs	$	25.6	$	—	$	—	$	25.6
State taxing jurisdiction NOLs		1.3		0.2		—		1.5
Non-U.S. taxing jurisdiction NOLs		—		0.1		—		0.1
U.S. federal tax credit carryforwards		0.1		—		—		0.1
U.S. federal and non-U.S. capital loss carryforwards		0.4		—		0.1		0.5
Total	$	27.4	$	0.3	$	0.1	$	27.8

Deferred Income Tax Assets and Liabilities

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts for income tax purposes. Deferred income tax assets and liabilities at December 31 are summarized as follows (dollars in millions): 

	December 31,
	2020			2019
Deferred tax assets:
Pension and postretirement benefits	$	70.1		$	90.7
Lease obligations		60.6			59.2
Employee benefits and compensation		39.3			35.5
Net operating loss carryforwards		27.2			30.8
Restricted stock and performance units		9.6			11.2
Inventories		5.9			14.1
Accrued liabilities		5.3			6.1
Capital loss and general business credit carryforwards		0.6			3.2
Derivatives		0.1			0.1
Gross deferred tax assets		218.7			250.9
Valuation allowance (b)		(0.5	)		(3.0	)
Net deferred tax assets	$	218.2		$	247.9
Deferred tax liabilities:
Property, plant and equipment	$	(465.6	)	$	(459.1	)
Goodwill and intangible assets		(72.7	)		(70.8	)
Right-of-use assets		(59.3	)		(58.1	)
Total deferred tax liabilities	$	(597.6	)	$	(588.0	)
Net deferred tax liabilities (c)	$	(379.4	)	$	(340.1	)

(b) Deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. Both the 2020 and 2019 valuation allowance relates to capital losses. We do not expect to generate capital gains before the capital losses expire. If or when recognized, the tax benefits relating to the reversal of any or all of the valuation allowance would be recognized as a benefit to income tax expense.

(c) As of December 31, 2020, we did not recognize U.S. deferred income taxes on our cumulative total of undistributed foreign earnings for our foreign subsidiaries. We indefinitely reinvest our earnings in operations outside the United States. It is not practicable to determine the amount of unrecognized deferred tax liability on these undistributed earnings because the actual tax liability, if any, is dependent on circumstances existing when the repatriation occurs.

Summary of Changes Related to PCA's Gross Unrecognized Tax Benefits Excluding Interest and Penalties

The following table summarizes the changes related to PCA’s gross unrecognized tax benefits excluding interest and penalties (dollars in millions):

	2020			2019				2018
Balance as of January 1	$	(4.8	)	$	(4.6	)	$	(4.8	)
Increases related to prior years’ tax positions		—			(0.1	)		(0.1	)
Increases related to current year tax positions		(0.4	)		(0.4	)		(0.3	)
Expiration of the statute of limitations		—			0.3			0.6
Balance at December 31	$	(5.2	)	$	(4.8	)	$	(4.6	)

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Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of our goodwill were as follows (dollars in millions):

						Total
	Packaging		Paper			Goodwill
Balance at January 1, 2019	$	862.1	$	55.2		$	917.3
Acquisitions (a)		1.4		—			1.4
Balance at December 31, 2019		863.5		55.2			918.7
Impairment of Paper segment		—		(55.2	)		(55.2	)
Balance at December 31, 2020	$	863.5	$	—		$	863.5

(a) During 2019, the Company recorded a $1.4 million adjustment to increase the goodwill balance for the Company’s October 2018 acquisition of Englander.

Components of Intangible Assets

The weighted average useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):

	As of December 31, 2020						As of December 31, 2019
	Weighted Average Remaining Useful Life (in Years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Remaining Useful Life (in Years)		Gross Carrying Amount		Accumulated Amortization
Customer relationships (b)(c)		9.1	$	503.8	$	220.2		10.0	$	503.8	$	180.2
Trademarks and trade names		9.3		34.8		23.0		9.5		34.8		20.6
Other		1.2		4.3		3.8		2.1		4.3		3.3
Total intangible assets (excluding goodwill)		9.1	$	542.9	$	247.0		9.9	$	542.9	$	204.1

(b) During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

(c) During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million.

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Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Accrued Liabilities Current And Noncurrent [Abstract]

Components of Accrued Liabilities

The components of accrued liabilities were as follows (dollars in millions):

	December 31,
	2020		2019
Compensation and benefits	$	126.5	$	124.5
Customer volume discounts and rebates		27.1		27.9
Medical insurance and workers’ compensation		25.5		26.3
Franchise, property, sales and use taxes		16.5		15.3
Environmental liabilities and asset retirement obligations		4.6		5.6
Severance, retention, and relocation		4.1		3.5
Other		11.9		14.4
Total	$	216.2	$	217.5

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Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Summary of Debt

At December 31, 2020 and 2019, our long-term debt and interest rates on that debt were as follows (dollars in millions):

	December 31, 2020					December 31, 2019
	Amount		Interest Rate			Amount		Interest rate
Revolving Credit Facility, due August 2021	$	—		—	%	$	—		—	%
4.50% Senior Notes, net of discount of $0.6 million    and $0.8 million as of December 31, 2020 and 2019,    respectively, due November 2023		699.4		4.50	%		699.2		4.50	%
3.65% Senior Notes, net of discount of $0.5 million    and $0.6 million as of December 31, 2020 and 2019,    respectively, due September 2024		399.5		3.65	%		399.4		3.65	%
3.40% Senior Notes, net of discount of $1.2 million    and $1.3 million as of December 31, 2020 and 2019,    respectively, due December 2027		498.8		3.40	%		498.7		3.40	%
3.00% Senior Notes, net of discount of $0.6 million    and $0.7 million as of December 31, 2020 and 2019,    respectively, due December 2029		499.4		3.00	%		499.3		3.00	%
4.05% Senior Notes, net of discount of $3.4 million    and $3.5 million as of December 31, 2020 and 2019,    respectively, due December 2049		396.6		4.05	%		396.5		4.05	%
Total		2,493.7		3.77	%		2,493.1		3.77	%
Less current portion		—		—	%		—		—	%
Less unamortized debt issuance costs		14.3					16.3
Total long-term debt	$	2,479.4		3.77	%	$	2,476.8		3.77	%

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Cash, Cash Equivalents, and Marketable Debt Securities (Tables)

12 Months Ended

Dec. 31, 2020

Cash Cash Equivalents And Short Term Investments [Abstract]

Schedule of Cash and Available-For-Sale Debt Securities by Major Asset Category

The following table shows the Company’s cash and available-for-sale (AFS) debt securities by major asset category at December 31, 2020 and 2019 (in millions):

	December 31, 2020
	Adjusted Cost Basis		Unrealized Gain		Unrealized Loss		Fair Value		Cash and Cash Equivalents		Short-Term Marketable Debt Securities		Long-Term Marketable Debt Securities
Cash and cash equivalents	$	970.5	$	—	$	—	$	970.5	$	970.5	$	—	$	—
Level 1 (a):
Money market funds		0.6		—		—		0.6		0.6		—		—
U.S. Treasury securities		28.1		0.2		—		28.3		—		18.9		9.4
Subtotal		28.7		0.2		—		28.9		0.6		18.9		9.4
Level 2 (b):
Certificates of deposit		5.9		—		—		5.9		1.1		4.8		—
Commercial paper		3.2		—		—		3.2		1.0		2.2		—
U.S. government agency securities		6.6		—		—		6.6		—		2.6		4.0
Corporate debt securities		107.5		0.3		—		107.8		1.4		77.1		29.3
Subtotal		123.2		0.3		—		123.5		3.5		86.7		33.3
Total	$	1,122.4	$	0.5	$	—	$	1,122.9	$	974.6	$	105.6	$	42.7

	December 31, 2019
	Adjusted Cost Basis		Unrealized Gain		Unrealized Loss		Fair Value (c)		Cash and Cash Equivalents		Short-Term Marketable Debt Securities		Long-Term Marketable Debt Securities
Cash and cash equivalents	$	675.6					$	675.6	$	675.6	$	—	$	—
Level 1 (a):
Money market funds		0.1		—		—		0.1		0.1		—		—
U.S. Treasury securities		27.1		—		—		27.1		3.1		11.5		12.5
Subtotal		27.2		—		—		27.2		3.2		11.5		12.5
Level 2 (b):
Certificates of deposit		3.9		—		—		3.9		—		3.9		—
Commercial paper		5.6		—		—		5.6		0.7		4.9		—
U.S. government agency securities		7.0		—		—		7.0		—		3.0		4.0
Corporate debt securities		106.2		—		—		106.2		—		64.6		41.6
Subtotal		122.7		—		—		122.7		0.7		76.4		45.6
Total	$	825.5	$	—	$	—	$	825.5	$	679.5	$	87.9	$	58.1

(a) Valuations based on quoted prices for identical assets and liabilities in active markets.

(b) Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

(c) Unrealized gains and losses were insignificant as of December 31, 2019. Therefore, the fair value approximates the adjusted cost basis for each major asset category.

Schedule of Marketable Debt Securities in Continuous Loss Position

The following table provides information about the Company’s marketable debt securities that have been in a continuous loss position as of December 31, 2020 and 2019 (in millions, except number of marketable debt securities in a loss position):

	December 31, 2020						December 31, 2019
	Fair Value of Marketable Debt Securities		Number of Marketable Debt Securities in a Loss Position		Unrealized Losses (d)		Fair Value of Marketable Debt Securities		Number of Marketable Debt Securities in a Loss Position		Unrealized Losses (d)
Corporate debt securities	$	42.9		56	$	—	$	63.3		61	$	—
Commercial paper		2.2		1		—		0.8		1		—
U.S. Treasury securities		1.7		3		—		14.0		9		—
Certificates of deposit		1.3		2		—		—		—		—
	$	48.1		62	$	—	$	78.1		71	$	—

(d) Unrealized losses were insignificant for the periods ended December 31, 2020 and 2019.

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Employee Benefit Plans and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Schedule of Obligations and Funded Status of Defined Benefit Pension and Postretirement Benefit Plans

The following table, which includes only company-sponsored defined benefit and other postretirement benefit plans, reconciles the beginning and ending balances of the projected benefit obligation and the fair value of plan assets. We recognize the unfunded status of these plans on the Consolidated Balance Sheets, and we recognize changes in funded status in the year changes occur through the Consolidated Statements of Comprehensive Income (dollars in millions):

	Pension Plans						Postretirement Plans
	Year Ended December 31						Year Ended December 31
	2020			2019			2020			2019
Change in Benefit Obligation:
Benefit obligation at beginning of period	$	1,420.1		$	1,204.9		$	14.5		$	14.6
Service cost		23.0			24.5			0.3			0.3
Interest cost		39.8			47.0			0.4			0.5
Plan amendments		1.3			2.3			—			(0.3	)
Actuarial (gain) loss (a)		132.0			188.6			(1.5	)		0.2
Participant contributions		—			—			0.9			1.1
Benefits paid		(50.6	)		(47.2	)		(1.5	)		(1.9	)
Benefit obligation at plan year end	$	1,565.6		$	1,420.1		$	13.1		$	14.5
Accumulated benefit obligation portion of above	$	1,520.4		$	1,374.4
Change in Fair Value of Plan Assets:
Plan assets at fair value at beginning of period	$	1,073.8		$	873.2		$	—		$	—
Actual return on plan assets		193.8			188.9			—			—
Company contributions		83.7			58.9			0.6			0.8
Participant contributions		—			—			0.9			1.1
Benefits paid		(50.6	)		(47.2	)		(1.5	)		(1.9	)
Fair value of plan assets at plan year end	$	1,300.7		$	1,073.8		$	—		$	—
Underfunded status	$	(264.9	)	$	(346.3	)	$	(13.1	)	$	(14.5	)
Amounts Recognized on Consolidated Balance Sheets:
Current liabilities		(1.2	)		(1.4	)		(0.6	)		(0.7	)
Noncurrent liabilities		(263.7	)		(344.9	)		(12.5	)		(13.8	)
Accrued obligation recognized at December 31	$	(264.9	)	$	(346.3	)	$	(13.1	)	$	(14.5	)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Prior service cost (credit)	$	21.7		$	24.7		$	(4.9	)	$	(5.3	)
Actuarial loss (gain)		223.5			239.2			(5.5	)		(4.4	)
Total	$	245.2		$	263.9		$	(10.4	)	$	(9.7	)

(a) For the year ended December 31, 2020, the most significant driver of the increase in benefit obligations for the plans was the actuarial losses due to the decrease in the discount rate assumption. The OPEB plans experienced a net actuarial gain primarily due to changes in demographic assumptions that were partially offset by the effect of the change in the discount rate assumption. For the year ended December 31, 2019, the benefit obligation loss for the pension plans was due largely to a decrease in the discount rate assumption and a change in the mortality assumption to adopt the Society of Actuaries’ newly released longevity study. For the OPEB plans, the net loss on the benefit obligation was driven by the decrease in the discount rate assumption partially offset by the effect of favorable demographic experience and the repeal of the excise tax originally implemented with the Affordable Care Act.

Components of Net Periodic Benefit Costs and Other Comprehensive (Income) Loss (Pretax)

The components of net periodic benefit cost and other comprehensive (income) loss (pretax) were as follows (dollars in millions):

	Pension Plans									Postretirement Plans
	Year Ended December 31,									Year Ended December 31,
	2020			2019			2018			2020			2019			2018
Service cost	$	23.0		$	24.5		$	25.0		$	0.3		$	0.3		$	0.3
Interest cost		39.8			47.0			42.4			0.4			0.5			0.5
Expected return on plan assets		(56.8	)		(52.1	)		(56.7	)		—			—			—
Net amortization of unrecognized amounts:
Prior service cost (credit)		4.3			6.3			6.9			(0.4	)		(0.3	)		(0.3	)
Actuarial loss (gain)		10.8			7.0			9.4			(0.4	)		(0.4	)		(0.2	)
Net periodic benefit cost	$	21.1		$	32.7		$	27.0		$	(0.1	)	$	0.1		$	0.3
Changes in plan assets and benefit obligations    recognized in other comprehensive (income)    loss:
Actuarial net loss (gain)	$	(5.0	)	$	51.8		$	(4.6	)	$	(1.5	)	$	0.2		$	(1.2	)
Prior service cost (credit)		1.3			2.3			3.0			—			(0.3	)		(0.3	)
Amortization of prior service cost (credit)		(4.3	)		(6.3	)		(6.9	)		0.4			0.3			0.3
Amortization of actuarial loss (gain)		(10.8	)		(7.0	)		(9.4	)		0.4			0.4			0.2
Total recognized in other comprehensive    loss (income) (b)	$	(18.8	)	$	40.8		$	(17.9	)	$	(0.7	)	$	0.6		$	(1.0	)
Total recognized in net periodic benefit    cost and other comprehensive loss (income)    (pre-tax)	$	2.3		$	73.5		$	9.2		$	(0.8	)	$	0.7		$	(0.7	)

(b) Accumulated losses in excess of 10% of the greater of the projected benefit obligation or the market-related value of assets will be recognized on a straight-line basis over the average remaining service period of active employees in PCA plans (which is between seven and nine years) and over the average remaining lifetime of inactive participants of Boise plans (which is between 23 and 26 years), to the extent that losses are not offset by gains in subsequent years.

Weighted-Average Assumptions Used To Determine Benefit Obligations and Net Periodic Benefit Cost

The following table presents the assumptions used in the measurement of our benefits obligations:

	Pension Plans			Postretirement Plans
	December 31,			December 31,
	2020	2019	2018	2020	2019	2018
Weighted-Average Assumptions Used to    Determine Benefit Obligations at    December 31:
Discount rate	2.57%	3.25%	4.31%	2.60%	3.18%	4.21%
Rate of compensation increase	4.00%	4.00%	4.00%	N/A	N/A	N/A
Weighted-Average Assumptions Used to    Determine Net Periodic Benefit Cost for the    Years Ended December 31:
Discount rate	3.25%	4.31%	3.66%	3.18%	4.21%	3.57%
Expected return on plan assets	5.29%	6.06%	6.06%	N/A	N/A	N/A
Rate of compensation increase	4.00%	4.00%	4.00%	N/A	N/A	N/A

Assumed Health Care Cost Trend Rates For Postretirement Benefits

Health Care Cost Trend Rate Assumptions. PCA assumed health care cost trend rates for its postretirement benefits plans were as follows:

	2020	2019	2018
Health care cost trend rate assumed for next year	6.82%	7.09%	7.24%
Rate to which the cost trend rate is assumed to decline    (the ultimate trend rate)	4.50%	4.50%	4.44%
Year that the rate reaches the ultimate trend rate	2029	2029	2028

Schedule of Pension Plans' Assets Investment Policies and Strategies

Assets of our pension plans were invested in the following classes of securities at December 31, 2020 and 2019:

	Percentage of Fair Value at December 31,
	2020			2019
Fixed income securities		48	%		50	%
International equity securities		29	%		27	%
Domestic equity securities		21	%		22	%
Other		2	%		1	%

Schedule of Fair Value Measurements of Plan Assets by Major Asset Category

The following tables set forth, by level within the fair value hierarchy, discussed in Note 2, Summary of Significant Accounting Policies, the pension plan assets, by major asset category, at fair value at December 31, 2020 and 2019 (dollars in millions):

	Fair Value Measurements at December 31, 2020
Asset Category	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Net Asset Value (NAV) (a)		Total
Short-term investments	$	—	$	25.1	$	—	$	—	$	25.1
Common/collective trust funds:
International equities		198.4		32.8		—		136.9		368.1
Domestic equities		—		276.9		—		—		276.9
Corporate and government bonds:
Corporate bonds		—		318.3		—		—		318.3
Government bonds and agencies		—		243.4		—		—		243.4
Fixed income		—		49.4		—		—		49.4
Municipal bonds		—		15.9		—		—		15.9
Private equity securities (b)		—		—		2.0		—		2.0
Total securities at fair value	$	198.4	$	961.8	$	2.0	$	136.9	$	1,299.1
Accrued income										1.6
Total fair value of plan assets									$	1,300.7

	Fair Value Measurements at December 31, 2019
Asset Category	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Net Asset Value (NAV) (a)		Total
Cash and short-term investments	$	—	$	14.9	$	—	$	—	$	14.9
Common/collective trust funds:
International equities		163.0		20.8		—		102.3		286.1
Domestic equities		—		240.5		—		—		240.5
Corporate and government bonds:
Fixed income		140.4		154.6		—		—		295.0
Government bonds and agencies		—		160.7		—		—		160.7
Corporate bonds		—		70.6		—		—		70.6
Municipal bonds		—		5.8				—		5.8
Private equity securities (b)		—		—		2.6		—		2.6
Total securities at fair value	$	303.4	$	667.9	$	2.6	$	102.3	$	1,076.2
Accrued expenses and receivables										(2.4	)
Total fair value of plan assets									$	1,073.8

(a) In accordance with ASC 820, Fair Value Measurement, certain investments that do not have readily-determinable fair values are measured at fair value using the net asset value (NAV) per share practical expedient and are not classified within the fair value hierarchy.

(b) Investments in this category are invested in the Pantheon Global Secondary Fund IV, LP. The fund specializes in investments in the private equity secondary market and occasionally directly in private companies to maximize capital growth. Fund investments are carried at fair value as determined quarterly using the market approach to estimate the fair value of private investments. The market approach utilizes prices and other relevant information generated by market transactions, type of security, size of the position, degree of liquidity, restrictions on the disposition, latest round of financing data, current financial position, and operating results, among other factors. In circumstances where fair values are not provided with respect to any of the company's fund investments, the investment advisor will seek to determine the fair value of such investments based on information provided by the general partners or managers of such funds or from other sources. Audited financial statements are provided by fund management annually. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the ultimate underlying investee companies means that there are inherent difficulties in determining the value of the investments. Amounts realized on the sale of these

investments may differ from the calculated values. Boise had originally committed to a $15.0 million investment, with $2.0 million of the commitment unfunded at December 31, 2020.

Summary of Changes in Pension Plans' Level 3 Assets

The following table sets forth a summary of changes in the fair value of the pension plans' Level 3 assets for the year ended December 31, 2020 (dollars in millions):

	2020
Balance, beginning of year	$	2.6
Acquisitions		—
Purchases		—
Sales		(0.6	)
Unrealized gain		—
Balance, end of year	$	2.0

Schedule of Estimated Benefit Payments

The following are estimated benefit payments to be paid to current plan participants by year (dollars in millions). Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the Company.

	Pension Plans		Postretirement Plans
2021	$	56.5	$	0.5
2022		60.2		0.5
2023		63.9		0.5
2024		67.0		0.5
2025 - 2030		456.2		3.4

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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation [Abstract]

Changes to Asset Retirement Obligation

The following table describes changes to the asset retirement obligation liability (dollars in millions):

	Year Ended December 31,
	2020			2019
Asset retirement obligation at beginning of period	$	27.8		$	30.0
Accretion expense		1.3			1.5
Payments		(0.8	)		(3.5	)
Revisions in estimated cash flows (a)		3.5			(0.2	)
Asset retirement obligation at end of period	$	31.8		$	27.8

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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share Based Compensation [Abstract]

Summary of Restricted Stock Activity

A summary of the Company’s restricted stock activity follows:

	2020					2019					2018
	Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value
Restricted stock at January 1		716,952		$	94.50		743,591		$	86.90		739,732		$	77.23
Granted		204,960			94.25		199,499			95.48		173,144			114.63
Vested (a)		(244,823	)		72.11		(212,809	)		68.59		(165,547	)		72.84
Forfeitures		(7,987	)		99.94		(13,329	)		98.86		(3,738	)		78.66
Restricted stock at December 31		669,102		$	102.55		716,952		$	94.50		743,591		$	86.90

(a) The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $23.6 million, $19.9 million, and $18.9 million, respectively.

Summary of Performance Units Activity

A summary of the Company’s performance unit activity follows:

	2020					2019					2018
	Units			Weighted Average Grant- Date Fair Value		Units			Weighted Average Grant- Date Fair Value		Units			Weighted Average Grant- Date Fair Value
Performance units at January 1		323,147		$	96.56		266,704		$	90.01		226,558		$	77.07
Granted		111,287			99.20		109,545			97.24		83,515			115.35
Vested (b)		(77,017	)		67.57		(53,102	)		65.03		(43,369	)		71.19
Performance units at December 31		357,417		$	103.63		323,147		$	96.56		266,704		$	90.01

(b) The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $8.5 million, $5.5 million, and $5.4 million, respectively. Upon vesting of the awards in 2020, 2019, and 2018, PCA issued 86,015 shares, 59,165 shares, and 46,876 shares, respectively. For 2020, 2019, and 2018, these amounts included 8,998 shares, 6,063 shares, and 3,507 shares, respectively, for dividends accrued during the vesting period.

Compensation Expense for Share-Based Awards

Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures was as follows (dollars in millions):

	Year Ended December 31,
	2020			2019			2018
Restricted stock	$	20.1		$	22.6		$	18.6
Performance units		9.9			7.8			4.9
Impact on income before income taxes		30.0			30.4			23.5
Income tax benefit		(7.6	)		(7.6	)		(5.9	)
Impact on net income	$	22.4		$	22.8		$	17.6

Unrecognized Compensation Expense for Share-Based Awards

The unrecognized compensation expense for all share-based awards was as follows (dollars in millions):

	December 31, 2020
	Unrecognized Compensation Expense		Remaining Weighted Average Recognition Period (in years)
Restricted stock	$	25.8	2.5
Performance units		17.6	2.2
Total unrecognized share-based compensation expense	$	43.4		2.3

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Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Impact of Derivative Instruments on Consolidated Statements of Income and Accumulated OCI

The impact of derivative instruments on the consolidated statements of income and accumulated OCI was as follows (dollars in millions):

	Loss Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended December 31,
	2020		2019			2018
Amortization of treasury locks (included in interest    expense, net)	$	—	$	(18.2	)	$	(5.3	)

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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Components of Changes in Accumulated Other Comprehensive Income (AOCI)

Changes in AOCI, net of taxes, by component follows (dollars in millions). Amounts in parentheses indicate losses.

	Foreign Currency Translation Adjustments			Unrealized Loss on Treasury Locks, Net			Unrealized Loss on Foreign Exchange Contracts			Unrealized Loss on Marketable Debt Securities		Unfunded Employee Benefit Obligations			Total
Balance at January 1, 2019	$	(0.4	)	$	(10.2	)	$	(0.3	)	$	—	$	(127.9	)	$	(138.8	)
Other comprehensive income before reclassifications		—			—			—			—		(40.5	)		(40.5	)
Amounts reclassified from AOCI		—			10.2			0.1			—		9.5			19.8
Net current-period other comprehensive income (loss)		—			10.2			0.1			—		(31.0	)		(20.7	)
Balance at December 31, 2019	$	(0.4	)	$	—		$	(0.2	)	$	—	$	(158.9	)	$	(159.5	)
Other comprehensive income before reclassifications		—			—			—			0.3		4.0			4.3
Amounts reclassified from AOCI		—			—			—			—		10.7			10.7
Net current-period other comprehensive income		—			—			—			0.3		14.7			15.0
Balance at December 31, 2020	$	(0.4	)	$	—		$	(0.2	)	$	0.3	$	(144.2	)	$	(144.5	)

Reclassifications Out of Accumulated Other Comprehensive Income (AOCI)

The following table presents information about reclassifications out of AOCI (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income.

	Amounts Reclassified from AOCI Year Ended December 31,
Details about AOCI Components	2020			2019
Unrealized loss on treasury locks, net (a)	$	—		$	(18.1	)
		—			7.9		Tax benefit
	$	—		$	(10.2	)	Net of tax
Unfunded employee benefit obligations (b)
Amortization of prior service costs	$	(3.9	)	$	(6.0	)
Amortization of actuarial gains / (losses)		(10.4	)		(6.7	)
		(14.3	)		(12.7	)	Total before tax
		3.6			3.2		Tax benefit
	$	(10.7	)	$	(9.5	)	Net of tax

(a) For 2019, this AOCI component is included in interest expense, net. The amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The remaining balances of the treasury locks were written off as a result of the Company’s November 2019 debt refinancing. For a discussion of treasury lock derivative instrument activity, see Note 15, Derivative Instruments and Hedging Activities, for additional information.

(b) These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Segment Sales to External Customers by Product Line

Segment sales to external customers by product line were as follows (dollars in millions):

	Year Ended December 31,
	2020		2019		2018
Packaging	$	5,919.5	$	5,932.2	$	5,938.5
Paper		674.8		964.3		1,002.0
Corporate and Other		63.9		67.8		74.1
	$	6,658.2	$	6,964.3	$	7,014.6

Analysis of Operations by Reportable Segment

An analysis of operations by reportable segment is as follows (dollars in millions):

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2020	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,901.7	$	17.8		$	5,919.5		$	829.5		(a)	$	365.2	$	394.8	$	5,744.0
Paper		674.7		0.1			674.8			(20.0	)	(b)(c)		36.5		20.1		497.2
Corporate and Other		81.8		131.3			213.1			(85.6	)			8.3		6.3		1,192.0
Intersegment eliminations		—		(149.2	)		(149.2	)		—				—		—		—
	$	6,658.2	$	—		$	6,658.2			723.9			$	410.0	$	421.2	$	7,433.2
Non-operating pension income										2.3
Interest expense, net										(93.5	)
Income before taxes									$	632.7

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2019	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,905.1	$	27.1		$	5,932.2		$	963.4		(d)	$	342.8	$	367.4	$	5,491.5
Paper		964.3		—			964.3			175.4		(e)		37.7		23.8		791.4
Corporate and Other		94.9		133.1			228.0			(85.1	)			7.0		8.3		952.9
Intersegment eliminations		—		(160.2	)		(160.2	)		—				—		—		—
	$	6,964.3	$	—		$	6,964.3			1,053.7			$	387.5	$	399.5	$	7,235.8
Non-operating pension expense										(7.9	)
Interest expense, net										(128.8	)	(f)
Income before taxes									$	917.0

	Sales, net								Operating				Depreciation,
Year Ended December 31, 2018	Trade		Inter- segment			Total			Income (Loss)				Amortization, and Depletion		Capital Expenditures (j)		Assets
Packaging	$	5,912.3	$	26.2		$	5,938.5		$	1,045.4		(g)	$	342.0	$	504.0	$	5,347.0
Paper		1,002.0		—			1,002.0			97.7		(h)		62.0		12.6		760.1
Corporate and Other		100.3		129.4			229.7			(75.4	)	(i)		6.9		34.8		462.6
Intersegment eliminations		—		(155.6	)		(155.6	)		—				—		—		—
	$	7,014.6	$	—		$	7,014.6			1,067.7			$	410.9	$	551.4	$	6,569.7
Non-operating pension expense										(2.1	)
Interest expense, net										(95.1	)
Income before taxes									$	970.5

(a)     Includes the following:

o $27.3 million of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility during the second quarter of 2020.

o $10.0 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.

o $6.3 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(b)     Includes the following:

o $0.8 million of restructuring costs for paper administrative functions.

o $0.6 million incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

(c)     During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.

(d)     Includes the following:

o $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

o $0.8 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

o $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility.

(e)     Includes $0.2 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side           white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(f)     Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs.

(g)     Includes the following:

o $12.3 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

o $1.6 million of charges consisting of closure costs related to corrugated products facilities.

o $0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities.

o $0.2 million of charges for acquisition and integration costs related to recent acquisitions.

(h)     Includes $17.7 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

(i)     Includes $0.2 million of charges consisting of closure costs related to a corporate administration facility.

(j)     Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisitions of businesses, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.

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Commitments, Guarantees, Indemnifications, and Legal Proceedings (Tables)

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Schedule Of Purchase Commitments

Total purchase commitments were as follows (dollars in millions):

2021	$	53.5
2022		48.2
2023		48.0
2024		27.3
2025		26.8
Thereafter		79.8
Total	$	283.6

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Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Data

2020:	First (a)		Second (b)		Third (c)		Fourth (d)		Total
Net sales	$	1,708.7	$	1,541.6	$	1,693.7	$	1,714.2	$	6,658.2
Gross profit		365.0		325.8		345.4		333.3		1,369.4
Income from operations		209.1		116.1		209.5		189.3		723.9
Net income		141.7		56.7		139.1		123.5		461.0
Basic earnings per share		1.50		0.60		1.47		1.30		4.86
Diluted earnings per share		1.49		0.59		1.46		1.30		4.84
Stock price - high		112.89		112.80		114.32		138.95		138.95
Stock price - low		71.05		80.17		92.02		106.08		71.05

2019:	First (e)		Second		Third (f)		Fourth (g)		Total
Net sales	$	1,733.7	$	1,759.9	$	1,750.7	$	1,720.0	$	6,964.3
Gross profit		421.4		427.9		411.4		383.3		1,644.0
Income from operations		275.4		280.4		262.8		235.1		1,053.7
Net income		186.8		193.6		179.8		136.2		696.4
Basic earnings per share		1.98		2.05		1.90		1.44		7.36
Diluted earnings per share		1.97		2.04		1.89		1.43		7.34
Stock price - high		101.84		103.80		109.37		114.78		114.78
Stock price - low		81.87		87.85		96.30		100.54		81.87

Note: The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in the weighted average shares outstanding throughout the year.

(a) Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

(b) Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

(c) Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

(d) Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

(e) Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

(f) Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

(g) Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

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Nature of Operations and Basis of Presentation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 employee Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Date of incorporation	Jan. 25, 1999
Number of employees of PCA | employee	15,200
Number of reportable segments | Segment	3

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Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended		12 Months Ended
		May 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) a	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items]
Research and development costs					$ 15,500,000	$ 16,000,000.0	$ 14,400,000
Cash and cash equivalents			$ 974,600,000		974,600,000	679,500,000
Cash equivalents			662,200,000		662,200,000	410,700,000
Other-than-temporary impairment charges on available-for-sale securities					0	0
Allowance for doubtful accounts			3,000,000.0		$ 3,000,000.0	3,000,000.0
Customer returns, allowances and earned discounts as a percentage of gross selling price					1.00%
Reserve for customer accounts receivable, percentage					1.00%
Reserve for customer deductions					$ 7,600,000	8,400,000
Interest capitalization, construction in progress					3,700,000	3,400,000	4,500,000
Depreciation expense					362,500,000	346,800,000	361,700,000
Incremental depreciation					$ 4,500,000	$ 300,000	14,500,000
Intangible asset, useful life, in years					9 years 1 month 6 days	9 years 10 months 24 days
Goodwill			863,500,000		$ 863,500,000	$ 918,700,000	917,300,000
Goodwill and intangible asset impairment					0	0	0
Goodwill impairment			0		55,200,000
Deferred financing costs			14,300,000		$ 14,300,000	16,300,000
Area leased under timberland cutting rights (acres) | a					71,000
Depletion expense					$ 3,100,000	2,700,000	7,600,000
Software amortization expense					1,100,000	900,000	2,100,000
Cloud computing arrangements			4,000,000.0		4,000,000.0
Operating lease liabilities			242,500,000		242,500,000	240,200,000
Other long-term assets
Summary of Significant Accounting Policies [Line Items]
Long-term lease costs capitalization (Cutting rights)			20,300,000		20,300,000	21,600,000
Net capitalized software costs			4,800,000		$ 4,800,000	1,400,000
Adjustments for New Accounting Pronouncement | Long-term debt
Summary of Significant Accounting Policies [Line Items]
Deferred financing costs						$ 14,300,000	16,300,000
ASU 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating lease liabilities								$ 228,000,000
Paper Reporting Unit
Summary of Significant Accounting Policies [Line Items]
Goodwill impairment		$ 55,200,000		$ 55,200,000
Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	[1],[2]				9 years 1 month 6 days	10 years
Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					9 years 3 months 18 days	9 years 6 months
Paper
Summary of Significant Accounting Policies [Line Items]
Recoverability test results recoverable percentage		100.00%
Goodwill			0		$ 0	$ 55,200,000	$ 55,200,000
Goodwill impairment					$ 55,200,000
Minimum
Summary of Significant Accounting Policies [Line Items]
Term of senior credit facilities and notes, in years					10 years
Minimum | Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					10 years
Minimum | Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					5 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Term of senior credit facilities and notes, in years					30 years
Maximum | Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					40 years
Maximum | Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					20 years
Foreign operations
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents			$ 2,200,000		$ 2,200,000	$ 2,400,000

[1] During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million

[2] During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

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Summary of Significant Accounting Policies - Components of Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 263.5	$ 271.5
Work in process	11.6	11.0
Finished goods	183.6	207.7
Supplies and materials	329.2	303.9
Inventories	$ 787.9	$ 794.1

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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 7,313.5	$ 6,997.8
Less accumulated depreciation	(4,120.1)	(3,846.1)
Property, plant and equipment, net	3,193.4	3,151.7
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	179.6	177.5
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	858.5	837.4
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	5,826.6	5,727.4
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	360.0	174.0
Other
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 88.8	$ 81.5

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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	12 Months Ended
	Dec. 31, 2020
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated useful life of asset, description	Period of the lease or useful life, if shorter
Minimum | Buildings And Land Improvements
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	5 years
Minimum | Machinery and Equipment
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	3 years
Minimum | Trucks and Automobiles
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	3 years
Minimum | Furniture and Fixtures
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	3 years
Minimum | Computers and Hardware
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	3 years
Maximum | Buildings And Land Improvements
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	40 years
Maximum | Machinery and Equipment
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	25 years
Maximum | Trucks and Automobiles
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	10 years
Maximum | Furniture and Fixtures
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	20 years
Maximum | Computers and Hardware
Property Plant And Equipment [Line Items]
Estimated useful life of asset (in years)	10 years

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Leases - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) Lease	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)
Leases [Line Items]
Number of leases | Lease	2
Lease term	12 months
Finance lease obligations	$ 16,000,000.0		$ 17,500,000
Total lease expense		$ 115,100,000
Sublease rental income		0
Interest paid, finance lease obligations		$ 1,300,000
Buildings Machinery and Equipment
Leases [Line Items]
Finance lease obligations	$ 16,000,000.0		$ 17,500,000
Real Estate Leases | Minimum
Leases [Line Items]
Lease renewal term	1 year
Real Estate Leases | Maximum
Leases [Line Items]
Lease renewal term	5 years

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Schedule of Supplemental Balance Sheet Information Related to Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 234.2	$ 234.3
Current portion of operating lease obligations	68.9	62.6
Long-term portion of operating lease obligations	173.6	177.6
Total operating lease obligations	$ 242.5	$ 240.2

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Schedule of Supplemental Balance Sheet Information Related to Finance Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Line Items]
Total	$ 7,313.5	$ 6,997.8
Less accumulated amortization	(4,120.1)	(3,846.1)
Property, plant and equipment, net	3,193.4	3,151.7
Current portion of finance lease obligations	1.6	1.5
Long-term portion of finance lease obligations	14.4	16.0
Total finance lease obligations	16.0	17.5
Buildings
Leases [Line Items]
Total	858.5	837.4
Machinery and Equipment
Leases [Line Items]
Total	5,826.6	5,727.4
Finance Leases
Leases [Line Items]
Total	28.8	28.8
Less accumulated amortization	(19.6)	(18.1)
Property, plant and equipment, net	9.2	10.7
Finance Leases | Buildings
Leases [Line Items]
Total	0.3	0.3
Finance Leases | Machinery and Equipment
Leases [Line Items]
Total	$ 28.5	$ 28.5

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Schedule of Weighted Average Remaining Lease Term and Weighted Average Discount Rates for Leases (Details)	Dec. 31, 2020	Dec. 31, 2019
Weighted-average remaining lease term (years):
Operating leases	5 years 3 months 18 days	5 years 7 months 6 days
Finance leases	7 years 9 months 18 days	8 years 9 months 18 days
Weighted-average discount rate:
Operating leases	3.79%	4.23%
Finance leases	6.66%	6.66%

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Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease cost:
Amortization of finance lease assets	$ 1.5	$ 1.5
Interest on lease liabilities	1.1	1.2
Total finance lease cost	2.6	2.7
Operating lease cost	74.4	70.2
Short-term lease cost	18.0	19.2
Variable lease cost	12.9	13.7
Total lease cost	$ 107.9	$ 105.8

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Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ (68.2)	$ (60.0)
Operating cash flows for finance leases	(1.5)	(1.5)
Financing cash flows for finance leases	(1.1)	(1.2)
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	(35.7)	(27.7)
Supplemental non-cash information on changes in lease liabilities	34.8	44.5
Supplemental non-cash information on changes in right-of-use assets	$ 35.8	$ 21.4

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Schedule of Future Minimum Payments Under Operating and Finance Lease Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Operating leases
2021		$ 76.7
2022		58.9
2023		42.3
2024		30.3
2025		21.1
Thereafter		40.4
Total lease payments		269.7
Less imputed interest	[1]	(27.2)
Present value of lease liabilities		242.5	$ 240.2
Finance leases
2021		2.7
2022		2.7
2023		2.7
2024		2.7
2025		2.7
Thereafter		7.0
Total lease payments		20.5
Less imputed interest	[1]	(4.5)
Present value of lease liabilities		$ 16.0	$ 17.5

[1] Calculated using the incremental borrowing rate for each lease applied to the future payments.

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Revenue - Summary of Revenues Disaggregated by Product Line (Details) - USD ($) $ in Millions	3 Months Ended															12 Months Ended
	Dec. 31, 2020	[1]	Sep. 30, 2020	[2]	Jun. 30, 2020	[3]	Mar. 31, 2020	[4]	Dec. 31, 2019	[5]	Sep. 30, 2019	[6]	Jun. 30, 2019	Mar. 31, 2019	[7]	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,714.2		$ 1,693.7		$ 1,541.6		$ 1,708.7		$ 1,720.0		$ 1,750.7		$ 1,759.9	$ 1,733.7		$ 6,658.2	$ 6,964.3	$ 7,014.6
Packaging
Disaggregation Of Revenue [Line Items]
Revenue																5,919.5	5,932.2	5,938.5
Paper
Disaggregation Of Revenue [Line Items]
Revenue																674.8	964.3	1,002.0
Corporate and Other
Disaggregation Of Revenue [Line Items]
Revenue																$ 63.9	$ 67.8	$ 74.1

[1] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[2] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[3] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[4] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[5] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[6] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[7] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

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Revenue - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020
Packaging Corporation of America
Revenue [Line Items]
Variable interest entity, ownership percentage	50.00%
Boise Cascade Co-Owner of LTP
Revenue [Line Items]
Variable interest entity, ownership percentage	50.00%

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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															12 Months Ended
	Dec. 31, 2020	[1]	Sep. 30, 2020	[2]	Jun. 30, 2020	[3]	Mar. 31, 2020	[4]	Dec. 31, 2019	[5]	Sep. 30, 2019	[6]	Jun. 30, 2019	Mar. 31, 2019	[7]	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 123.5		$ 139.1		$ 56.7		$ 141.7		$ 136.2		$ 179.8		$ 193.6	$ 186.8		$ 461.0	$ 696.4	$ 738.0
Less: distributed and undistributed earnings allocated to participating securities																(3.6)	(5.2)	(5.7)
Net income attributable to common stockholders																$ 457.4	$ 691.2	$ 732.3
Denominator:
Weighted average common shares outstanding (in shares)																94.1	93.8	93.7
Effect of dilutive securities (in shares)																0.3	0.3	0.2
Diluted common shares outstanding (in shares)																94.4	94.1	93.9
Basic income per common share (in dollars per share)	$ 1.30		$ 1.47		$ 0.60		$ 1.50		$ 1.44		$ 1.90		$ 2.05	$ 1.98		$ 4.86	$ 7.36	$ 7.82
Diluted income per common share (in dollars per share)	$ 1.30		$ 1.46		$ 0.59		$ 1.49		$ 1.43		$ 1.89		$ 2.04	$ 1.97		$ 4.84	$ 7.34	$ 7.80

[1] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[2] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[3] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[4] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[5] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[6] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[7] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

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Other Expense, Net - Components of Other Expense, Net (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset disposals and write-offs	[1]	$ (26.5)	$ (25.0)	$ (17.3)
Facilities closure and other costs	[2]	(19.1)	(0.3)	(1.6)
Insurance deductible for property damage	[3]			(0.5)
Acquisition and integration related costs	[4]			(0.2)
Other		(5.1)	(6.7)	(6.7)
Total		$ (50.7)	(32.7)	(41.2)
Wallula, Washington Mill
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring	[5]		$ (0.7)	$ (14.9)

[1] For 2019, includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

[2] For 2020, includes charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a closed corrugated products facility during the second quarter of 2020. For 2019, includes charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility. For 2018, includes charges consisting of closure costs related to corrugated products facilities.

[3] Includes charges for the property damage insurance deductible for a weather-related incident at one of our corrugated products facilities.

[4] Includes charges for acquisition and integration costs related to recent acquisitions.

[5] Includes charges related to the discontinuation of production of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill in the second quarter of 2018 and the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

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Other Expense, Net - Components of Other Expense, Net (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Charges for disposal of fixed assets	$ (6.8)	$ (8.2)	$ (5.8)
DeRidder, Louisiana Mill
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Charges for disposal of fixed assets		$ 3.0

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Income Taxes - Components of Consolidated Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax provision -
U.S. federal	$ 109.4	$ 123.2	$ 150.7
State and local	27.5	37.0	42.9
Foreign	0.1	0.1	0.2
Total current provision for taxes	137.0	160.3	193.8
Deferred income tax provision (benefit) -
U.S. federal	26.8	55.3	34.7
State and local	8.0	5.0	4.0
Foreign	(0.1)
Total deferred provision (benefit) for taxes	34.7	60.3	38.7
Total provision for taxes	$ 171.7	$ 220.6	$ 232.5

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Income Taxes - Summary of Effective Tax Rate (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision computed at U.S. federal statutory rate		$ 132.9	$ 192.6	$ 203.8
Federal tax reform				(2.0)
State and local taxes, net of federal benefit		28.4	35.7	36.9
Goodwill impairment	[1]	11.6
Other		(1.2)	(7.7)	(6.2)
Total provision for taxes		$ 171.7	$ 220.6	$ 232.5

[1] For additional information regarding the impairment of goodwill within our Paper reporting unit, see Note 8, Goodwill and Intangible Assets.

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Income Taxes - Summary of Effective Tax Rate (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	21.00%	21.00%	21.00%

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Income Taxes - Details of Scheduled Expiration Dates of Tax Effected Net Operating Loss (NOL) and Other Tax Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	$ 27.8
U.S. federal
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	25.6
U.S. federal tax credit carryforwards	0.1
State taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	1.5
Non U.S. taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	0.1
U.S. federal and non-U.S.
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
U.S. federal and non-U.S. capital loss carryforwards	0.5
2020 Through 2029
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	27.4
2020 Through 2029 | U.S. federal
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	25.6
U.S. federal tax credit carryforwards	0.1
2020 Through 2029 | State taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	1.3
2020 Through 2029 | U.S. federal and non-U.S.
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
U.S. federal and non-U.S. capital loss carryforwards	0.4
2030 Through 2039
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	0.3
2030 Through 2039 | State taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	0.2
2030 Through 2039 | Non U.S. taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	0.1
Indefinite
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	0.1
Indefinite | U.S. federal and non-U.S.
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
U.S. federal and non-U.S. capital loss carryforwards	$ 0.1

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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Pension and postretirement benefits		$ 70.1	$ 90.7
Lease obligations		60.6	59.2
Employee benefits and compensation		39.3	35.5
Net operating loss carryforwards		27.2	30.8
Restricted stock and performance units		9.6	11.2
Inventories		5.9	14.1
Accrued liabilities		5.3	6.1
Capital loss and general business credit carryforwards		0.6	3.2
Derivatives		0.1	0.1
Gross deferred tax assets		218.7	250.9
Valuation allowance	[1]	(0.5)	(3.0)
Net deferred tax assets		218.2	247.9
Deferred tax liabilities:
Property, plant and equipment		(465.6)	(459.1)
Goodwill and intangible assets		(72.7)	(70.8)
Right-of-use assets		(59.3)	(58.1)
Total deferred tax liabilities		(597.6)	(588.0)
Net deferred tax liabilities	[2]	$ (379.4)	$ (340.1)

[1] Deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. Both the 2020 and 2019 valuation allowance relates to capital losses. We do not expect to generate capital gains before the capital losses expire. If or when recognized, the tax benefits relating to the reversal of any or all of the valuation allowance would be recognized as a benefit to income tax expense.

[2] As of December 31, 2020, we did not recognize U.S. deferred income taxes on our cumulative total of undistributed foreign earnings for our foreign subsidiaries. We indefinitely reinvest our earnings in operations outside the United States. It is not practicable to determine the amount of unrecognized deferred tax liability on these undistributed earnings because the actual tax liability, if any, is dependent on circumstances existing when the repatriation occurs.

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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Cash payments for income taxes	$ 115.6	$ 172.7	$ 140.8
Gross reserve for unrecognized tax benefits, excluding interest and penalties	5.2	4.8	$ 4.6	$ 4.8
Unrecognized tax benefits that would impact of effective tax rate	4.6
Interest accrued related to unrecognized tax benefits and penalties	1.2	$ 1.2
Reasonably possible decrease in unrecognized tax benefits related to state apportionment issues in next 12 months	$ 3.1
Boise Inc.
Income Taxes [Line Items]
Open tax year	2008 2009 2010 2011 2012 2013
Non U.S. taxing jurisdiction
Income Taxes [Line Items]
Open tax year	2009
State taxing jurisdiction
Income Taxes [Line Items]
Open tax year	2016 2017 2018 2019 2020
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Income tax examination (description)	A federal examination of the 2016 tax year commenced in April 2019.
Open tax year	2016 2017 2018 2019 2020

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Income Taxes - Summary of Changes Related to PCAs Gross Unrecognized Tax Benefits Excluding Interest and Penalties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Balance as of January 1	$ (4.8)	$ (4.6)	$ (4.8)
Increases related to prior years’ tax positions		(0.1)	(0.1)
Increases related to current year tax positions	(0.4)	(0.4)	(0.3)
Expiration of the statute of limitations		0.3	0.6
Balance at December 31	$ (5.2)	$ (4.8)	$ (4.6)

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Goodwill and Intangible Assets -Goodwill - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	May 31, 2020	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill impairment charge		$ 0		$ 55,200,000
Discount rate utilized	0.09
Alternative Investment, Valuation Technique [Extensible List]	us-gaap:IncomeApproachValuationTechniqueMember
Alternative Investment, Measurement Input [Extensible List]	us-gaap:MeasurementInputDiscountRateMember
Goodwill		863,500,000		863,500,000	$ 918,700,000	$ 917,300,000
Packaging
Goodwill [Line Items]
Goodwill		863,500,000		863,500,000	863,500,000	862,100,000
Paper
Goodwill [Line Items]
Goodwill impairment charge				55,200,000
Goodwill		$ 0		$ 0	$ 55,200,000	$ 55,200,000
Recoverability test results recoverable percentage	100.00%
Paper Reporting Unit
Goodwill [Line Items]
Goodwill impairment charge	$ 55,200,000		$ 55,200,000

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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)		3 Months Ended	12 Months Ended
		Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Beginning Balance			$ 918,700,000	$ 917,300,000
Impairment of Paper segment		$ 0	(55,200,000)
Ending Balance		863,500,000	863,500,000	918,700,000
Englander
Goodwill [Line Items]
Acquisitions	[1]			1,400,000
Packaging
Goodwill [Line Items]
Beginning Balance			863,500,000	862,100,000
Ending Balance		863,500,000	863,500,000	863,500,000
Packaging | Englander
Goodwill [Line Items]
Acquisitions	[1]			1,400,000
Paper
Goodwill [Line Items]
Beginning Balance			55,200,000	55,200,000
Impairment of Paper segment			(55,200,000)
Ending Balance		$ 0	$ 0	$ 55,200,000

[1] During 2019, the Company recorded a $1.4 million adjustment to increase the goodwill balance for the Company’s October 2018 acquisition of Englander.

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Goodwill and Intangible Assets - Goodwill (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Englander
Goodwill [Line Items]
Increase to goodwill, acquisition adjustment	$ 1.4

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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)		9 years 1 month 6 days	9 years 10 months 24 days
Gross Carrying Amount		$ 542.9	$ 542.9
Accumulated Amortization		$ 247.0	$ 204.1
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	[1],[2]	9 years 1 month 6 days	10 years
Gross Carrying Amount	[1],[2]	$ 503.8	$ 503.8
Accumulated Amortization	[1],[2]	$ 220.2	$ 180.2
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)		9 years 3 months 18 days	9 years 6 months
Gross Carrying Amount		$ 34.8	$ 34.8
Accumulated Amortization		$ 23.0	$ 20.6
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)		1 year 2 months 12 days	2 years 1 month 6 days
Gross Carrying Amount		$ 4.3	$ 4.3
Accumulated Amortization		$ 3.8	$ 3.3

[1] During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million

[2] During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

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Goodwill and Intangible Assets - Components of Intangible Assets (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Adjustment to decrease the remaining book value of intangible asset	$ 4.5	$ 4.5	$ 0.7

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Goodwill and Intangible Assets - Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible assets amortization expense		$ 42.9	$ 38.6	$ 40.5
2021		37.3
2022		34.9
2023		33.9
2024		33.4
2025		33.2
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Adjustment to decrease the remaining book value of intangible asset	$ 4.5	$ 4.5	$ 0.7

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Goodwill and Intangible Assets - Impairment Testing - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	May 31, 2020	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Goodwill impairment charge		$ 0		$ 55,200,000
Intangible asset impairment charge		$ 0
Paper Reporting Unit
Finite Lived Intangible Assets [Line Items]
Goodwill impairment charge	$ 55,200,000		$ 55,200,000

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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Compensation and benefits	$ 126.5	$ 124.5
Customer volume discounts and rebates	27.1	27.9
Medical insurance and workers’ compensation	25.5	26.3
Franchise, property, sales and use taxes	16.5	15.3
Environmental liabilities and asset retirement obligations	4.6	5.6
Severance, retention, and relocation	4.1	3.5
Other	11.9	14.4
Total	$ 216.2	$ 217.5

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Debt - Summary of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Nov. 21, 2019	Dec. 13, 2017	Sep. 05, 2014	Oct. 22, 2013
Debt Instrument [Line Items]
Long-term debt	$ 2,493.7	$ 2,493.1
Less current portion	0.0	0.0
Less unamortized debt issuance costs	14.3	16.3
Long-term debt	$ 2,479.4	$ 2,476.8
Weighted-average interest rate	3.77%	3.77%
Revolving Credit Facility, due August 2021 | Line of Credit
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.0
Stated interest rate	0.00%	0.00%
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 699.4	$ 699.2
Stated interest rate	4.50%	4.50%				4.50%
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 399.5	$ 399.4
Stated interest rate	3.65%	3.65%			3.65%
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 498.8	$ 498.7
Stated interest rate	3.40%	3.40%		3.40%
3.00% Senior Notes, due December 2029
Debt Instrument [Line Items]
Stated interest rate		3.00%
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 499.4	$ 499.3
Stated interest rate	3.00%	3.00%	3.00%
4.05% Senior Notes, due December 2049
Debt Instrument [Line Items]
Stated interest rate		4.05%
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 396.6	$ 396.5
Stated interest rate	4.05%	4.05%	4.05%
Current Portion of Long-term Debt
Debt Instrument [Line Items]
Weighted-average interest rate	0.00%	0.00%
Long-term Debt, Excluding Current Portion
Debt Instrument [Line Items]
Weighted-average interest rate	3.77%	3.77%

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Debt - Summary of Debt (Parenthetical) (Details) - USD ($) $ in Millions					12 Months Ended
	Nov. 21, 2019	Dec. 13, 2017	Sep. 05, 2014	Oct. 22, 2013	Dec. 31, 2020	Dec. 31, 2019
Revolving Credit Facility, due August 2021 | Line of Credit
Debt Instrument [Line Items]
Credit facility, expiration date					Aug. 21, 2021	Aug. 21, 2021
Stated interest rate					0.00%	0.00%
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate				4.50%	4.50%	4.50%
Senior notes, discount					$ 0.6	$ 0.8
Debt instrument, maturity date				Nov. 01, 2023	Nov. 01, 2023	Nov. 01, 2023
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate			3.65%		3.65%	3.65%
Senior notes, discount					$ 0.5	$ 0.6
Debt instrument, maturity date			Sep. 15, 2024		Sep. 15, 2024	Sep. 15, 2024
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		3.40%			3.40%	3.40%
Senior notes, discount					$ 1.3	$ 1.3
Debt instrument, maturity date		Dec. 15, 2027			Dec. 15, 2027	Dec. 15, 2027
3.00% Senior Notes, due December 2029
Debt Instrument [Line Items]
Stated interest rate						3.00%
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.00%				3.00%	3.00%
Senior notes, discount					$ 0.6	$ 0.7
Debt instrument, maturity date	Dec. 15, 2029				Dec. 15, 2029	Dec. 15, 2029
4.05% Senior Notes, due December 2049
Debt Instrument [Line Items]
Stated interest rate						4.05%
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.05%				4.05%	4.05%
Senior notes, discount					$ 3.4	$ 3.5
Debt instrument, maturity date	Dec. 15, 2049				Dec. 15, 2049	Dec. 15, 2049

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Debt - Additional Information (Details) - USD ($)							1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 23, 2019	Dec. 06, 2019	Nov. 21, 2019	Dec. 13, 2017	Sep. 05, 2014	Oct. 22, 2013	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Annual Principal Maturities for Debt [Abstract]
2021									$ 0
2022									0
2023									700,000,000.0
2024									400,000,000.0
2025 and thereafter									1,400,000,000
Interest payments									97,000,000.0	$ 114,000,000.0	$ 97,000,000.0
Amortization of net (loss) gain on treasury lock										(18,200,000)	(5,300,000)
Amortization of financing costs									2,000,000.0	$ 4,500,000	$ 2,700,000
Write-off of deferred debt issuance costs							$ 1,800,000
Treasury Lock
Annual Principal Maturities for Debt [Abstract]
Amortization of net (loss) gain on treasury lock							$ (13,100,000)	$ (13,100,000)
Senior Notes
Debt Instrument [Line Items]
Debt issuance costs									8,300,000
Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity									350,000,000.0
Unused borrowing capacity									326,300,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Outstanding letters of credit									$ 23,700,000
3.00% Senior Notes, due December 2029
Debt Instrument [Line Items]
Stated interest rate								3.00%		3.00%
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount			$ 500,000,000.0
Stated interest rate			3.00%					3.00%	3.00%	3.00%
Debt instrument, maturity date			Dec. 15, 2029						Dec. 15, 2029	Dec. 15, 2029
4.05% Senior Notes, due December 2049
Debt Instrument [Line Items]
Stated interest rate								4.05%		4.05%
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount			$ 400,000,000.0
Stated interest rate			4.05%					4.05%	4.05%	4.05%
Debt instrument, maturity date			Dec. 15, 2049						Dec. 15, 2049	Dec. 15, 2049
2.45% Senior Notes, due December 2020
Debt Instrument [Line Items]
Stated interest rate								2.45%		2.45%
Debt instrument, redemption amount included premiums, accrued and unpaid interest								$ 509,700,000		$ 509,700,000
2.45% Senior Notes, due December 2020 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount			$ 500,000,000.0
Stated interest rate		2.45%	2.45%
Debt instrument, maturity date			Dec. 15, 2020
Debt instrument, redemption amount		$ 509,700,000
Debt instrument, redemption premium		3,800,000
Debt instrument, accrued and unpaid interest		$ 5,800,000
3.90% Senior Notes, due June 2022
Debt Instrument [Line Items]
Stated interest rate								3.90%		3.90%
Debt instrument, redemption amount included premiums, accrued and unpaid interest								$ 418,700,000		$ 418,700,000
3.90% Senior Notes, due June 2022 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount			$ 400,000,000.0
Stated interest rate	3.90%		3.90%
Debt instrument, maturity date			Jun. 15, 2022
Debt instrument, redeem date			2019-12
Debt instrument, redemption amount	$ 418,700,000
Debt instrument, redemption premium	18,400,000
Debt instrument, accrued and unpaid interest	$ 300,000
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount						$ 700,000,000.0
Stated interest rate						4.50%		4.50%	4.50%	4.50%
Debt instrument, maturity date						Nov. 01, 2023			Nov. 01, 2023	Nov. 01, 2023
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 400,000,000.0
Stated interest rate					3.65%			3.65%	3.65%	3.65%
Debt instrument, maturity date					Sep. 15, 2024				Sep. 15, 2024	Sep. 15, 2024
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount				$ 500,000,000.0
Stated interest rate				3.40%				3.40%	3.40%	3.40%
Debt instrument, maturity date				Dec. 15, 2027					Dec. 15, 2027	Dec. 15, 2027
Fixed-Rate Senior Notes | Senior Notes
Debt Instrument [Line Items]
Book value of fixed rate debt									$ 2,493,700,000
Long-term debt (fixed-rate debt), fair value									2,827,100,000
6.50% Senior Notes due March 2018 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate											6.50%
Debt instrument, maturity date											Mar. 15, 2018
Repayment of debt											$ 150,000,000.0
Redemption Premiums
Annual Principal Maturities for Debt [Abstract]
Interest payments									$ 22,200,000

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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Company's Cash and Available-For-Sale (AFS) Debt Securities by Major Asset Category (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Financial Instruments [Line Items]
Adjusted Cost Basis		$ 1,122.4	$ 825.5
Unrealized Gain		0.5
Fair Value	[1]	1,122.9	825.5
Cash and cash equivalents		974.6	679.5
Short-term marketable debt securities		105.6	87.9
Long-term marketable debt securities		42.7	58.1
Level 1
Financial Instruments [Line Items]
Adjusted Cost Basis	[2]	28.7	27.2
Unrealized Gain	[2]	0.2
Fair Value	[1],[2]	28.9	27.2
Cash and cash equivalents	[2]	0.6	3.2
Short-term marketable debt securities	[2]	18.9	11.5
Long-term marketable debt securities	[2]	9.4	12.5
Level 2
Financial Instruments [Line Items]
Adjusted Cost Basis	[3]	123.2	122.7
Unrealized Gain	[3]	0.3
Fair Value	[1],[3]	123.5	122.7
Cash and cash equivalents	[3]	3.5	0.7
Short-term marketable debt securities	[3]	86.7	76.4
Long-term marketable debt securities	[3]	33.3	45.6
Cash and Cash Equivalents
Financial Instruments [Line Items]
Adjusted Cost Basis		970.5	675.6
Fair Value	[1]	970.5	675.6
Cash and cash equivalents		970.5	675.6
Money Market Fund | Level 1
Financial Instruments [Line Items]
Adjusted Cost Basis	[2]	0.6	0.1
Fair Value	[1],[2]	0.6	0.1
Cash and cash equivalents	[2]	0.6	0.1
U.S. Treasury Securities | Level 1
Financial Instruments [Line Items]
Adjusted Cost Basis	[2]	28.1	27.1
Unrealized Gain	[2]	0.2
Fair Value	[1],[2]	28.3	27.1
Cash and cash equivalents	[2]		3.1
Short-term marketable debt securities	[2]	18.9	11.5
Long-term marketable debt securities	[2]	9.4	12.5
Certificates of Deposit | Level 2
Financial Instruments [Line Items]
Adjusted Cost Basis	[3]	5.9	3.9
Fair Value	[1],[3]	5.9	3.9
Cash and cash equivalents	[3]	1.1
Short-term marketable debt securities	[3]	4.8	3.9
Commercial Paper | Level 2
Financial Instruments [Line Items]
Adjusted Cost Basis	[3]	3.2	5.6
Fair Value	[1],[3]	3.2	5.6
Cash and cash equivalents	[3]	1.0	0.7
Short-term marketable debt securities	[3]	2.2	4.9
U.S. Government Agency Securities | Level 2
Financial Instruments [Line Items]
Adjusted Cost Basis	[3]	6.6	7.0
Fair Value	[1],[3]	6.6	7.0
Short-term marketable debt securities	[3]	2.6	3.0
Long-term marketable debt securities	[3]	4.0	4.0
Corporate Debt Securities | Level 2
Financial Instruments [Line Items]
Adjusted Cost Basis	[3]	107.5	106.2
Unrealized Gain	[3]	0.3
Fair Value	[1],[3]	107.8	106.2
Cash and cash equivalents	[3]	1.4
Short-term marketable debt securities	[3]	77.1	64.6
Long-term marketable debt securities	[3]	$ 29.3	$ 41.6

[1] Unrealized gains and losses were insignificant as of December 31, 2019. Therefore, the fair value approximates the adjusted cost basis for each major asset category.

[2] Valuations based on quoted prices for identical assets and liabilities in active markets.

[3] Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

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Cash, Cash Equivalents, and Marketable Debt Securities - Additional Information (Details)	Dec. 31, 2020
Minimum
Financial Instruments [Line Items]
Long-term marketable debt securities maturity period	1 year
Maximum
Financial Instruments [Line Items]
Long-term marketable debt securities maturity period	2 years

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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities | $	$ 48.1	$ 78.1
Number of Marketable Debt Securities in a Loss Position | security	62	71
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities | $	$ 1.3
Number of Marketable Debt Securities in a Loss Position | security	2
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities | $	$ 2.2	$ 0.8
Number of Marketable Debt Securities in a Loss Position | security	1	1
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities | $	$ 1.7	$ 14.0
Number of Marketable Debt Securities in a Loss Position | security	3	9
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Marketable Debt Securities | $	$ 42.9	$ 63.3
Number of Marketable Debt Securities in a Loss Position | security	56	61

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Employee Benefit Plans and Other Postretirement Benefits - Change in Benefit Obligations and Change in Fair Value of Plan Assets Related to Pension and Postretirement Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts Recognized on Consolidated Balance Sheets:
Noncurrent liabilities		$ (298.3)	$ (375.5)
Pension Plans
Change in Benefit Obligations [Roll Forward]
Benefit obligation at beginning of period		1,420.1	1,204.9
Service cost		23.0	24.5	$ 25.0
Interest cost		39.8	47.0	42.4
Plan amendments		1.3	2.3
Actuarial (gain) loss	[1]	132.0	188.6
Participant contributions
Benefits paid		(50.6)	(47.2)
Benefit obligation at plan year end		1,565.6	1,420.1	1,204.9
Accumulated benefit obligation portion of above		1,520.4	1,374.4
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value at beginning of period		1,073.8	873.2
Actual return on plan assets		193.8	188.9
Company contributions		83.7	58.9
Benefits paid		(50.6)	(47.2)
Fair value of plan assets at plan year end		1,300.7	1,073.8	873.2
Underfunded status		(264.9)	(346.3)
Amounts Recognized on Consolidated Balance Sheets:
Current liabilities		(1.2)	(1.4)
Noncurrent liabilities		(263.7)	(344.9)
Accrued obligation recognized at December 31		(264.9)	(346.3)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Prior service cost (credit)		21.7	24.7
Actuarial loss (gain)		223.5	239.2
Total		245.2	263.9
Postretirement Plans
Change in Benefit Obligations [Roll Forward]
Benefit obligation at beginning of period		14.5	14.6
Service cost		0.3	0.3	0.3
Interest cost		0.4	0.5	0.5
Plan amendments			(0.3)
Actuarial (gain) loss	[1]	(1.5)	0.2
Participant contributions		0.9	1.1
Benefits paid		(1.5)	(1.9)
Benefit obligation at plan year end		13.1	14.5	$ 14.6
Change in Fair Value of Plan Assets [Roll Forward]
Company contributions		0.6	0.8
Participant contributions		0.9	1.1
Benefits paid		(1.5)	(1.9)
Underfunded status		(13.1)	(14.5)
Amounts Recognized on Consolidated Balance Sheets:
Current liabilities		(0.6)	(0.7)
Noncurrent liabilities		(12.5)	(13.8)
Accrued obligation recognized at December 31		(13.1)	(14.5)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Prior service cost (credit)		(4.9)	(5.3)
Actuarial loss (gain)		(5.5)	(4.4)
Total		$ (10.4)	$ (9.7)

[1] For the year ended December 31, 2020, the most significant driver of the increase in benefit obligations for the plans was the actuarial losses due to the decrease in the discount rate assumption. The OPEB plans experienced a net actuarial gain primarily due to changes in demographic assumptions that were partially offset by the effect of the change in the discount rate assumption. For the year ended December 31, 2019, the benefit obligation loss for the pension plans was due largely to a decrease in the discount rate assumption and a change in the mortality assumption to adopt the Society of Actuaries’ newly released longevity study. For the OPEB plans, the net loss on the benefit obligation was driven by the decrease in the discount rate assumption partially offset by the effect of favorable demographic experience and the repeal of the excise tax originally implemented with the Affordable Care Act.

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Employee Benefit Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 23.0	$ 24.5	$ 25.0
Interest cost		39.8	47.0	42.4
Expected return on plan assets		(56.8)	(52.1)	(56.7)
Net amortization of unrecognized amounts, Prior service cost (credit)		4.3	6.3	6.9
Net amortization of unrecognized amounts, Actuarial loss (gain)		10.8	7.0	9.4
Net periodic benefit cost		21.1	32.7	27.0
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Actuarial net loss (gain)		(5.0)	51.8	(4.6)
Prior service cost (credit)		1.3	2.3	3.0
Amortization of prior service cost (credit)		(4.3)	(6.3)	(6.9)
Amortization of actuarial loss (gain)		(10.8)	(7.0)	(9.4)
Total recognized in other comprehensive loss (income)	[1]	(18.8)	40.8	(17.9)
Total recognized in net periodic benefit cost and other comprehensive loss (income) (pre-tax)		2.3	73.5	9.2
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.3	0.3	0.3
Interest cost		0.4	0.5	0.5
Net amortization of unrecognized amounts, Prior service cost (credit)		(0.4)	(0.3)	(0.3)
Net amortization of unrecognized amounts, Actuarial loss (gain)		(0.4)	(0.4)	(0.2)
Net periodic benefit cost		(0.1)	0.1	0.3
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Actuarial net loss (gain)		(1.5)	0.2	(1.2)
Prior service cost (credit)			(0.3)	(0.3)
Amortization of prior service cost (credit)		0.4	0.3	0.3
Amortization of actuarial loss (gain)		0.4	0.4	0.2
Total recognized in other comprehensive loss (income)	[1]	(0.7)	0.6	(1.0)
Total recognized in net periodic benefit cost and other comprehensive loss (income) (pre-tax)		$ (0.8)	$ 0.7	$ (0.7)

[1] Accumulated losses in excess of 10% of the greater of the projected benefit obligation or the market-related value of assets will be recognized on a straight-line basis over the average remaining service period of active employees in PCA plans (which is between seven and nine years) and over the average remaining lifetime of inactive participants of Boise plans (which is between 23 and 26 years), to the extent that losses are not offset by gains in subsequent years.

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Employee Benefit Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Accumulated losses, excess percentage threshold required on projected benefit obligation	10.00%
Packaging Corporation of America | Minimum
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period of active employees used for recognition of market-related value of assets	7 years
Packaging Corporation of America | Maximum
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period of active employees used for recognition of market-related value of assets	9 years
Boise Inc. | Minimum
Defined Benefit Plan Disclosure [Line Items]
Average remaining lifetime of inactive participants used for recognition of market-related value of assets	23 years
Boise Inc. | Maximum
Defined Benefit Plan Disclosure [Line Items]
Average remaining lifetime of inactive participants used for recognition of market-related value of assets	26 years

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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Accumulated benefit obligation for plans with obligations in excess of plan assets	$ 1,400.0
Weighted-Average expected return on plan assets for 2021	4.91%
Pension Contributions [Abstract]
Company's common stock	1.2	1.5
Deferred compensation liability	$ 22.6	$ 17.4
Minimum
Pension Contributions [Abstract]
Company's contribution to pension plan, percentage	3.00%
Maximum
Pension Contributions [Abstract]
Company's contribution to pension plan, percentage	5.00%
Pension Plans
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Weighted-Average expected return on plan assets for 2021	5.29%	6.06%	6.06%
Pension Contributions [Abstract]
Contributions to pension plan	$ 83.7	$ 58.9
Pension Plans | Qualified Plan
Pension Contributions [Abstract]
Contributions to pension plan	82.5	57.9	$ 21.8
Matching Contributions
Pension Contributions [Abstract]
Company's contribution to defined contribution plans	40.8	39.0	36.8
Service Related Contributions
Pension Contributions [Abstract]
Company's contribution to defined contribution plans	$ 39.4	$ 36.7	$ 33.3

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Employee Benefit Plans and Other Postretirement Benefits - Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets	4.91%
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate	2.57%	3.25%	4.31%
Weighted-Average Assumptions Used to Determine Benefit Obligations, Rate of compensation increase	4.00%	4.00%	4.00%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate	3.25%	4.31%	3.66%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets	5.29%	6.06%	6.06%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Rate of compensation increase	4.00%	4.00%	4.00%
Postretirement Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate	2.60%	3.18%	4.21%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate	3.18%	4.21%	3.57%

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Employee Benefit Plans and Other Postretirement Benefits - Schedule of Assumed Health Care Cost Trend Rates for Postretirement Benefits (Details) - Postretirement Plans	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Health care cost trend rate assumed for next year	6.82%	7.09%	7.24%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%	4.44%
Year that the rate reaches the ultimate trend rate	2029	2029	2028

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Employee Benefit Plans and Other Postretirement Benefits - Schedule of Pension Plan Asset Investments and Target Allocations (Details)	Dec. 31, 2020	Dec. 31, 2019
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	48.00%	50.00%
International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	29.00%	27.00%
U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	21.00%	22.00%
Other Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	2.00%	1.00%

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Employee Benefit Plans and Other Postretirement Benefits - Schedule of Fair Value Measurements of Plan Assets by Major Asset Category (Details) - Pension Plans - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		$ 1,300.7	$ 1,073.8	$ 873.2
Accrued Expenses and Receivables
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		1.6	(2.4)
Defined Benefit Plan, Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		25.1	14.9
International equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		368.1	286.1
Domestic equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		276.9	240.5
Corporate Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		318.3	70.6
U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		243.4	160.7
Fixed Income Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		49.4	295.0
Municipal Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		15.9	5.8
Private Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[1]	2.0	2.6
Total Securities at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		1,299.1	1,076.2
Quoted prices in active markets for identical assets (Level 1) | Defined Benefit Plan, Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | International equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		198.4	163.0
Quoted prices in active markets for identical assets (Level 1) | Domestic equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | Corporate Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | Fixed Income Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	140.4
Quoted prices in active markets for identical assets (Level 1) | Municipal Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | Private Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[1]	0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | Total Securities at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		198.4	303.4
Significant other observable inputs (Level 2) | Defined Benefit Plan, Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		25.1	14.9
Significant other observable inputs (Level 2) | International equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		32.8	20.8
Significant other observable inputs (Level 2) | Domestic equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		276.9	240.5
Significant other observable inputs (Level 2) | Corporate Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		318.3	70.6
Significant other observable inputs (Level 2) | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		243.4	160.7
Significant other observable inputs (Level 2) | Fixed Income Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		49.4	154.6
Significant other observable inputs (Level 2) | Municipal Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		15.9	5.8
Significant other observable inputs (Level 2) | Private Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[1]	0.0	0.0
Significant other observable inputs (Level 2) | Total Securities at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		961.8	667.9
Significant unobservable input (Level 3) | Defined Benefit Plan, Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | International equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | Domestic equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | Corporate Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | Fixed Income Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | Municipal Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		0.0	0.0
Significant unobservable input (Level 3) | Private Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[1]	2.0	2.6
Total fair value of plan assets		2.0	2.6
Significant unobservable input (Level 3) | Total Securities at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets		2.0	2.6
Net Asset Value (NAV) | Defined Benefit Plan, Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	0.0	0.0
Net Asset Value (NAV) | International equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	136.9	102.3
Net Asset Value (NAV) | Domestic equities (Common/Collective Trust Funds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	0.0	0.0
Net Asset Value (NAV) | Corporate Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	0.0	0.0
Net Asset Value (NAV) | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	0.0	0.0
Net Asset Value (NAV) | Fixed Income Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	0.0	0.0
Net Asset Value (NAV) | Municipal Bonds (Corporate and Government Bonds)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	0.0	0.0
Net Asset Value (NAV) | Private Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[1],[2]	0.0	0.0
Net Asset Value (NAV) | Total Securities at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of plan assets	[2]	$ 136.9	$ 102.3

[1] Investments in this category are invested in the Pantheon Global Secondary Fund IV, LP. The fund specializes in investments in the private equity secondary market and occasionally directly in private companies to maximize capital growth. Fund investments are carried at fair value as determined quarterly using the market approach to estimate the fair value of private investments. The market approach utilizes prices and other relevant information generated by market transactions, type of security, size of the position, degree of liquidity, restrictions on the disposition, latest round of financing data, current financial position, and operating results, among other factors. In circumstances where fair values are not provided with respect to any of the company's fund investments, the investment advisor will seek to determine the fair value of such investments based on information provided by the general partners or managers of such funds or from other sources. Audited financial statements are provided by fund management annually. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the ultimate underlying investee companies means that there are inherent difficulties in determining the value of the investments. Amounts realized on the sale of these investments may differ from the calculated values. Boise had originally committed to a $15.0 million investment, with $2.0 million of the commitment unfunded at December 31, 2020.

[2] In accordance with ASC 820, Fair Value Measurement, certain investments that do not have readily-determinable fair values are measured at fair value using the net asset value (NAV) per share practical expedient and are not classified within the fair value hierarchy.

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Employee Benefit Plans and Other Postretirement Benefits - Fair Value Measurements of Plan Assets (Parenthetical) (Details) - Private Equity Securities - Significant unobservable input (Level 3) $ in Millions	Dec. 31, 2020 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment commitment	$ 15.0
Unfunded portion of investment commitment	$ 2.0

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Employee Benefit Plans and Other Postretirement Benefits - Summary of Changes in Pension Plans' Level 3 Assets (Details) - Pension Plans $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Level 3 fair value of pension plans' assets [Roll Forward]
Plan assets at fair value at beginning of period	$ 1,073.8
Fair value of plan assets at plan year end	1,300.7
Significant unobservable input (Level 3) | Private Equity Securities
Level 3 fair value of pension plans' assets [Roll Forward]
Plan assets at fair value at beginning of period	2.6
Sales	(0.6)
Fair value of plan assets at plan year end	$ 2.0

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Employee Benefit Plans and Other Postretirement Benefits - Schedule of Estimated Benefit Payments (Details) $ in Millions	Dec. 31, 2020 USD ($)
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
2021	$ 56.5
2022	60.2
2023	63.9
2024	67.0
2025 - 2030	456.2
Postretirement Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
2021	0.5
2022	0.5
2023	0.5
2024	0.5
2025 - 2030	$ 3.4

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Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation at beginning of period		$ 27.8	$ 30.0
Accretion expense		1.3	1.5
Payments		(0.8)	(3.5)
Revisions in estimated cash flows	[1]	3.5	(0.2)
Asset retirement obligation at end of period		$ 31.8	$ 27.8

[1] For 2020, primarily consists of an adjustment of $4.5 million related to the San Lorenzo, California facility closure

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Asset Retirement Obligations - Changes to Asset Retirement Obligation (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Asset Retirement Obligation [Abstract]
Revisions in estimated cash flows adjustment	$ 4.5

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Share-Based Compensation - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 05, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term equity incentive plan, termination date	May 05, 2030
Number of shares available for future issuance under share-based plan	1,500,000			1,400,000
Number of shares authorized under plan	12,000,000.0
Restricted Stock | Officers and Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of ROIC as performance measure	4 years
Vesting period of TSR as performance measure	3 years
Percentage of ROIC as performance measure	50.00%	50.00%	50.00%
Percentage of TSR as performance measure	50.00%	50.00%	50.00%

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Share-Based Compensation - Summary of Restricted Stock and Performance Units Activity (Details) - $ / shares		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Restricted Stock and Performance Units [Roll Forward]
Outstanding at January 1		716,952	743,591	739,732
Granted		204,960	199,499	173,144
Vested	[1]	(244,823)	(212,809)	(165,547)
Forfeitures		(7,987)	(13,329)	(3,738)
Outstanding at December 31		669,102	716,952	743,591
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]
Weighted Average Grant-Date Fair Value, Outstanding at January 1		$ 94.50	$ 86.90	$ 77.23
Weighted Average Grant-Date Fair Value, Granted		94.25	95.48	114.63
Weighted Average Grant-Date Fair Value, Vested	[1]	72.11	68.59	72.84
Weighted Average Grant-Date Fair Value, Forfeitures		99.94	98.86	78.66
Weighted Average Grant-Date Fair Value, Outstanding at December 31		$ 102.55	$ 94.50	$ 86.90
Performance Units
Restricted Stock and Performance Units [Roll Forward]
Outstanding at January 1		323,147	266,704	226,558
Granted		111,287	109,545	83,515
Vested	[2]	(77,017)	(53,102)	(43,369)
Outstanding at December 31		357,417	323,147	266,704
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]
Weighted Average Grant-Date Fair Value, Outstanding at January 1		$ 96.56	$ 90.01	$ 77.07
Weighted Average Grant-Date Fair Value, Granted		99.20	97.24	115.35
Weighted Average Grant-Date Fair Value, Vested	[2]	67.57	65.03	71.19
Weighted Average Grant-Date Fair Value, Outstanding at December 31		$ 103.63	$ 96.56	$ 90.01

[1] The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $23.6 million, $19.9 million, and $18.9 million, respectively.

[2] The total fair value of awards upon vesting for the years ended December 31, 2020, 2019, and 2018 was $8.5 million, $5.5 million, and $5.4 million, respectively. Upon vesting of the awards in 2020, 2019, and 2018, PCA issued 86,015 shares, 59,165 shares, and 46,876 shares, respectively. For 2020, 2019, and 2018, these amounts included 8,998 shares, 6,063 shares, and 3,507 shares, respectively, for dividends accrued during the vesting period.

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Share-Based Compensation - Summary of Restricted Stock and Performance Units Activity (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	$ 23.6	$ 19.9	$ 18.9
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	$ 8.5	$ 5.5	$ 5.4
Stock Issued During Period, Shares, Restricted Stock Award, Gross	86,015	59,165	46,876
Common Stock Dividends, Shares	8,998	6,063	3,507

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Share-Based Compensation - Compensation Expense for Share-Based Awards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact on income before income taxes	$ 30.0	$ 30.4	$ 23.5
Income tax benefit	(7.6)	(7.6)	(5.9)
Impact on net income	22.4	22.8	17.6
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact on income before income taxes	20.1	22.6	18.6
Performance Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact on income before income taxes	$ 9.9	$ 7.8	$ 4.9

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Share-Based Compensation - Unrecognized Compensation Expense for Share-Based Awards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 43.4
Remaining weighted-average recognition period	2 years 3 months 18 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 25.8
Remaining weighted-average recognition period	2 years 6 months
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 17.6
Remaining weighted-average recognition period	2 years 2 months 12 days

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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008
Derivative [Line Items]
Amortization of net (loss) gain on treasury lock			$ (18.2)	$ (5.3)
3.90% Senior Notes, due June 2022
Derivative [Line Items]
Stated interest rate		3.90%	3.90%
2008 Interest Rate Protection Agreement
Derivative [Line Items]
Payments for (Proceeds from) settlement of interest rate protection agreement							$ 4.4
2010 Interest Rate Protection Agreement
Derivative [Line Items]
Payments for (Proceeds from) settlement of interest rate protection agreement						$ (9.9)
2011 Interest Rate Protection Agreement
Derivative [Line Items]
Payments for (Proceeds from) settlement of interest rate protection agreement					$ 65.5
Treasury Lock
Derivative [Line Items]
Amortization of net (loss) gain on treasury lock	$ (13.1)	$ (13.1)
Amortization of treasury lock settlements, after tax		6.5
Income tax benefit from stranded tax effects in accumulated OCI related to write-off of remaining treasury lock		$ 3.2

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Derivative Instruments and Hedging Activities - Impact of Derivative Instruments on Consolidated Statements of Income and Accumulated OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interest Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Loss Reclassified from Accumulated OCI into Income (Effective Portion)	$ (18.2)	$ (5.3)

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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions			12 Months Ended
	Jan. 15, 2021	Dec. 10, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 25, 2016
Common stock dividends paid			$ 299,600,000	$ 298,700,000	$ 268,100,000
Dividends declared per common share			$ 3.37	$ 3.16	$ 3.00
Dividends paid per common share (in dollars per share)		$ 1.00
Stock repurchase program, authorized amount						$ 200,000,000.0
Repurchases of common stock under stock repurchase program			0	0
Common stock repurchase authorization amount available			$ 193,000,000.0
Minimum
Dividends declared per common share			$ 3.16
Maximum
Dividends declared per common share			$ 4.00
Subsequent Event
Common stock dividends paid	$ 94,800,000

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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 3,071.0
Other comprehensive income before reclassifications	4.3	$ (40.5)
Amounts reclassified from AOCI	10.7	19.8
Other comprehensive income (loss)	15.0	(20.7)	$ 18.1
Ending balance	3,246.3	3,071.0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(0.4)	(0.4)
Ending balance	(0.4)	(0.4)	(0.4)
Unfunded Employee Benefit Obligations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(158.9)	(127.9)
Other comprehensive income before reclassifications	4.0	(40.5)
Amounts reclassified from AOCI	10.7	9.5
Other comprehensive income (loss)	14.7	(31.0)
Ending balance	(144.2)	(158.9)	(127.9)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(159.5)	(138.8)
Ending balance	(144.5)	(159.5)	(138.8)
Unrealized Loss on Treasury Locks, Net | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(10.2)
Amounts reclassified from AOCI		10.2
Other comprehensive income (loss)		10.2
Ending balance			(10.2)
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(0.2)	(0.3)
Amounts reclassified from AOCI		0.1
Other comprehensive income (loss)		0.1
Ending balance	(0.2)	$ (0.2)	$ (0.3)
Marketable Debt Securities | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income before reclassifications	0.3
Other comprehensive income (loss)	0.3
Ending balance	$ 0.3

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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended															12 Months Ended
		Dec. 31, 2020	[2]	Sep. 30, 2020	[3]	Jun. 30, 2020	[4]	Mar. 31, 2020	[5]	Dec. 31, 2019	[6]	Sep. 30, 2019	[7]	Jun. 30, 2019	Mar. 31, 2019	[8]	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net																	$ (93.5)	$ (128.8)	[1]	$ (95.1)
Income before taxes																	632.7	917.0		970.5
Income tax benefit																	(171.7)	(220.6)		(232.5)
Net income		$ 123.5		$ 139.1		$ 56.7		$ 141.7		$ 136.2		$ 179.8		$ 193.6	$ 186.8		461.0	696.4		$ 738.0
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	[9]																(3.9)	(6.0)
Amortization of actuarial gains / (losses)	[9]																(10.4)	(6.7)
Income before taxes																	(14.3)	(12.7)
Income tax benefit																	3.6	3.2
Net income																	$ (10.7)	(9.5)
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	[10]																	(18.1)
Income tax benefit																		7.9
Net income																		$ (10.2)

[1] Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs.

[2] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[3] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[4] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[5] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[6] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[7] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[8] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

[9] These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

[10] For 2019, this AOCI component is included in interest expense, net. The amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The remaining balances of the treasury locks were written off as a result of the Company’s November 2019 debt refinancing. For a discussion of treasury lock derivative instrument activity, see Note 15, Derivative Instruments and Hedging Activities, for additional information.

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Concentrations of Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) employee	Dec. 31, 2019 USD ($)
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 832.4	$ 845.6
Number of employees of PCA | employee	15,200
Percentage of hourly employees represented by unions	62.00%
Workforce Subject to Collective Bargaining Arrangements | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	44.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
Office Depot | Credit Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 39.6	$ 76.2
Office Depot | Total Company Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%	7.00%
Office Depot | Total Company Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%	9.00%
Paper | Office Depot | Paper Segment Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%	50.00%

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Transactions With Related Parties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 7,433.2	$ 7,235.8	$ 6,569.7
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	$ 70.6	81.7	83.1
Fiber costs from related parties	70.6	81.7	83.1
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs
Related Party Transaction [Line Items]
Fiber costs from related parties	$ 12.6	16.8	$ 16.8
Packaging Corporation of America
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage	50.00%
Variable Interest Entity
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 2.5	3.9
Carrying amount of LTP's liabilities	$ 2.5	$ 3.9

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Segment Information - Additional Information (Details)	3 Months Ended															12 Months Ended
	Dec. 31, 2020 USD ($)		Sep. 30, 2020 USD ($)	[2]	Jun. 30, 2020 USD ($)	[3]	Mar. 31, 2020 USD ($)	[4]	Dec. 31, 2019 USD ($)		Sep. 30, 2019 USD ($)	[6]	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	[7]	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment																3
Net sales	$ 1,714,200,000	[1]	$ 1,693,700,000		$ 1,541,600,000		$ 1,708,700,000		$ 1,720,000,000.0	[5]	$ 1,750,700,000		$ 1,759,900,000	$ 1,733,700,000		$ 6,658,200,000	$ 6,964,300,000	$ 7,014,600,000
Foreign operations
Segment Reporting Information [Line Items]
Net sales																318,700,000	394,900,000	$ 487,800,000
Long-Lived Assets	$ 0								$ 0							$ 0	$ 0

[1] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[2] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[3] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[4] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[5] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[6] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[7] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

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Segment Information - Segment Sales to External Customers by Product Line (Details) - USD ($) $ in Millions	3 Months Ended															12 Months Ended
	Dec. 31, 2020	[1]	Sep. 30, 2020	[2]	Jun. 30, 2020	[3]	Mar. 31, 2020	[4]	Dec. 31, 2019	[5]	Sep. 30, 2019	[6]	Jun. 30, 2019	Mar. 31, 2019	[7]	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Segment sales to external customers	$ 1,714.2		$ 1,693.7		$ 1,541.6		$ 1,708.7		$ 1,720.0		$ 1,750.7		$ 1,759.9	$ 1,733.7		$ 6,658.2	$ 6,964.3	$ 7,014.6
Packaging
Revenue from External Customer [Line Items]
Segment sales to external customers																5,919.5	5,932.2	5,938.5
Paper
Revenue from External Customer [Line Items]
Segment sales to external customers																674.8	964.3	1,002.0
Operating Segments
Revenue from External Customer [Line Items]
Segment sales to external customers																6,658.2	6,964.3	7,014.6
Operating Segments | Packaging
Revenue from External Customer [Line Items]
Segment sales to external customers																5,919.5	5,932.2	5,938.5
Operating Segments | Paper
Revenue from External Customer [Line Items]
Segment sales to external customers																674.8	964.3	1,002.0
Operating Segments | Corporate and Other
Revenue from External Customer [Line Items]
Segment sales to external customers																$ 63.9	$ 67.8	$ 74.1

[1] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[2] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[3] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[4] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[5] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[6] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[7] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

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Segment Information - Analysis of Operations by Reportable Segment (Details) - USD ($) $ in Millions		3 Months Ended															12 Months Ended
		Dec. 31, 2020		Sep. 30, 2020	[2]	Jun. 30, 2020	[3]	Mar. 31, 2020	[4]	Dec. 31, 2019		Sep. 30, 2019	[6]	Jun. 30, 2019	Mar. 31, 2019	[7]	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales		$ 1,714.2	[1]	$ 1,693.7		$ 1,541.6		$ 1,708.7		$ 1,720.0	[5]	$ 1,750.7		$ 1,759.9	$ 1,733.7		$ 6,658.2		$ 6,964.3		$ 7,014.6
Operating Income (Loss)		189.3	[1]	$ 209.5		$ 116.1		$ 209.1		235.1	[5]	$ 262.8		$ 280.4	$ 275.4		723.9		1,053.7		1,067.7
Non-operating pension income and expense																	2.3		(7.9)		(2.1)
Interest expense, net																	(93.5)		(128.8)	[8]	(95.1)
Income before taxes																	632.7		917.0		970.5
Depreciation, Amortization, and Depletion																	410.0		387.5		410.9
Capital Expenditures	[9]																421.2		399.5		551.4
Assets		7,433.2								7,235.8							7,433.2		7,235.8		6,569.7
Trade
Segment Reporting Information [Line Items]
Net sales																	6,658.2		6,964.3		7,014.6
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales																	(149.2)		(160.2)		(155.6)
Operating Segments
Segment Reporting Information [Line Items]
Net sales																	6,658.2		6,964.3		7,014.6
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net sales																	(149.2)		(160.2)		(155.6)
Packaging
Segment Reporting Information [Line Items]
Net sales																	5,919.5		5,932.2		5,938.5
Operating Income (Loss)																	829.5	[10]	963.4	[11]	1,045.4	[12]
Depreciation, Amortization, and Depletion																	365.2		342.8		342.0
Capital Expenditures	[9]																394.8		367.4		504.0
Assets		5,744.0								5,491.5							5,744.0		5,491.5		5,347.0
Packaging | Trade
Segment Reporting Information [Line Items]
Net sales																	5,901.7		5,905.1		5,912.3
Packaging | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales																	17.8		27.1		26.2
Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net sales																	5,919.5		5,932.2		5,938.5
Paper
Segment Reporting Information [Line Items]
Net sales																	674.8		964.3		1,002.0
Operating Income (Loss)																	(20.0)	[13],[14]	175.4	[15]	97.7	[16]
Depreciation, Amortization, and Depletion																	36.5		37.7		62.0
Capital Expenditures	[9]																20.1		23.8		12.6
Assets		497.2								791.4							497.2		791.4		760.1
Paper | Trade
Segment Reporting Information [Line Items]
Net sales																	674.7		964.3		1,002.0
Paper | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales																	0.1
Paper | Operating Segments
Segment Reporting Information [Line Items]
Net sales																	674.8		964.3		1,002.0
Corporate and Other
Segment Reporting Information [Line Items]
Net sales																	63.9		67.8		74.1
Operating Income (Loss)																	(85.6)		(85.1)		(75.4)	[17]
Depreciation, Amortization, and Depletion																	8.3		7.0		6.9
Capital Expenditures	[9]																6.3		8.3		34.8
Assets		$ 1,192.0								$ 952.9							1,192.0		952.9		462.6
Corporate and Other | Trade
Segment Reporting Information [Line Items]
Net sales																	81.8		94.9		100.3
Corporate and Other | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales																	131.3		133.1		129.4
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Net sales																	$ 213.1		$ 228.0		$ 229.7

[1] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[2] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[3] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[4] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[5] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[6] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[7] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

[8] Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs.

[9] Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisitions of businesses, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.

[10] (a)     Includes the following:   o $27.3 million of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility during the second quarter of 2020.   o $10.0 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.   o $6.3 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

[11] (d)     Includes the following:   o $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.   o $0.8 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.   o $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility.

[12] (g)     Includes the following:   o $12.3 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.   o $1.6 million of charges consisting of closure costs related to corrugated products facilities.   o $0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities.   o $0.2 million of charges for acquisition and integration costs related to recent acquisitions.

[13] (b)     Includes the following:   o $0.8 million of restructuring costs for paper administrative functions.   o $0.6 million incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.

[14] (c)     During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.

[15] Includes $0.2 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side           white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

[16] (h)     Includes $17.7 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.

[17] (i)     Includes $0.2 million of charges consisting of closure costs related to a corporate administration facility.

XML

Segment Information - Analysis of Operations by Reportable Segment (Parenthetical) (Details) - USD ($)			3 Months Ended					12 Months Ended
		May 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Goodwill impairment charge			$ 0					$ 55,200,000
Charges for disposal of fixed assets								(6,800,000)	$ (8,200,000)	$ (5,800,000)
Acquisition and integration related costs	[1]									200,000
Debt Refinancing
Segment Reporting Information [Line Items]
Restructuring charges							$ 38,700,000		38,700,000
Paper Reporting Unit
Segment Reporting Information [Line Items]
Goodwill impairment charge		$ 55,200,000			$ 55,200,000
Packaging and Paper
Segment Reporting Information [Line Items]
Restructuring charges			$ 4,000,000.0	$ 3,300,000	20,400,000			27,300,000
Paper
Segment Reporting Information [Line Items]
Restructuring charges								800,000
Goodwill impairment charge								55,200,000
Packaging
Segment Reporting Information [Line Items]
Restructuring charges									300,000	1,600,000
Property damage and business interruption insurance										500,000
Acquisition and integration related costs										200,000
Corporate and Other
Segment Reporting Information [Line Items]
Restructuring charges										200,000
DeRidder, Louisiana Mill
Segment Reporting Information [Line Items]
Charges for disposal of fixed assets									3,000,000.0
DeRidder, Louisiana Mill | Packaging
Segment Reporting Information [Line Items]
Charges for disposal of fixed assets									3,000,000.0
Wallula, Washington Mill | Paper
Segment Reporting Information [Line Items]
Restructuring charges									200,000	17,700,000
Wallula, Washington Mill | Packaging
Segment Reporting Information [Line Items]
Restructuring charges									$ 800,000	$ 12,300,000
Hurricane Laura | DeRidder, Louisiana Mill
Segment Reporting Information [Line Items]
Charges related to the impact of Hurricane Laura				$ 10,000,000.0				10,000,000.0
COVID-19 | Packaging and Paper
Segment Reporting Information [Line Items]
Incremental out-of-pocket costs					$ 6,100,000	$ 800,000		6,300,000
COVID-19 | Paper
Segment Reporting Information [Line Items]
Incremental out-of-pocket costs								$ 600,000

[1] Includes charges for acquisition and integration costs related to recent acquisitions.

XML

Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 08, 2017
Schedule Of Commitments And Contingencies [Line Items]
Capital commitments		$ 304,200,000	$ 212,600,000
Purchases during period under purchase agreements		317,600,000	315,000,000.0	$ 341,900,000
Environmental reserve		23,600,000
Environmental liabilities and asset retirement obligations		$ 4,600,000	$ 5,600,000
DeRidder, Louisiana
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, period of occurrence		February 8, 2017
Liability insurance					$ 1,000,000.0
Payment of penalties	$ 40,000
Asset Retirement Obligation
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve		$ 15,500,000
Environmental Contingencies
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve		8,100,000
Other Long-Term Liabilities
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve		$ 19,000,000.0
Minimum
Schedule Of Commitments And Contingencies [Line Items]
Purchase commitments term, years		1 year
Maximum
Schedule Of Commitments And Contingencies [Line Items]
Purchase commitments term, years		31 years

XML

Commitments, Guarantees, Indemnifications, and Legal Proceedings - Schedule of Purchase Commitments (Details) $ in Millions	Dec. 31, 2020 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2021	$ 53.5
2022	48.2
2023	48.0
2024	27.3
2025	26.8
Thereafter	79.8
Total	$ 283.6

XML

Quarterly Results of Operations (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended															12 Months Ended
	Dec. 31, 2020	[1]	Sep. 30, 2020	[2]	Jun. 30, 2020	[3]	Mar. 31, 2020	[4]	Dec. 31, 2019	[5]	Sep. 30, 2019	[6]	Jun. 30, 2019	Mar. 31, 2019	[7]	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,714.2		$ 1,693.7		$ 1,541.6		$ 1,708.7		$ 1,720.0		$ 1,750.7		$ 1,759.9	$ 1,733.7		$ 6,658.2	$ 6,964.3	$ 7,014.6
Gross profit	333.3		345.4		325.8		365.0		383.3		411.4		427.9	421.4		1,369.4	1,644.0	1,645.3
Income from operations	189.3		209.5		116.1		209.1		235.1		262.8		280.4	275.4		723.9	1,053.7	1,067.7
Net income	$ 123.5		$ 139.1		$ 56.7		$ 141.7		$ 136.2		$ 179.8		$ 193.6	$ 186.8		$ 461.0	$ 696.4	$ 738.0
Basic	$ 1.30		$ 1.47		$ 0.60		$ 1.50		$ 1.44		$ 1.90		$ 2.05	$ 1.98		$ 4.86	$ 7.36	$ 7.82
Diluted	1.30		1.46		0.59		1.49		1.43		1.89		2.04	1.97		4.84	7.34	$ 7.80
Stock price - high	138.95		114.32		112.80		112.89		114.78		109.37		103.80	101.84		138.95	114.78
Stock price - low	$ 106.08		$ 92.02		$ 80.17		$ 71.05		$ 100.54		$ 96.30		$ 87.85	$ 81.87		$ 71.05	$ 81.87

[1] Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).

[2] Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).

[3] Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).

[4] Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).

[5] Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).

[6] Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).

[7] Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).

XML

Quarterly Results of Operations (Unaudited) - Summary of Quarterly Financial Data (Parenthetical) (Details) - USD ($)		3 Months Ended							12 Months Ended
	May 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Data [Line Items]
Goodwill impairment charge		$ 0							$ 55,200,000
Debt Refinancing
Quarterly Financial Data [Line Items]
Restructuring charges						$ 38,700,000				$ 38,700,000
Treasury Lock
Quarterly Financial Data [Line Items]
Restructuring charges, after tax						$ 25,900,000
Restructuring charges, diluted per share						$ 0.28
Income tax benefit from stranded tax effects in accumulated OCI related to write-off of remaining treasury lock						$ 3,200,000
Wallula, Washington Mill
Quarterly Financial Data [Line Items]
Restructuring charges, after tax						$ 300,000	$ 2,300,000	$ 500,000
Restructuring charges, diluted per share						$ 0.00	$ 0.02	$ 0.01
Paper Reporting Unit
Quarterly Financial Data [Line Items]
Goodwill impairment charge	$ 55,200,000			$ 55,200,000
Non-cash goodwill impairment charge, after tax				$ 55,200,000
Non-cash goodwill impairment charge, diluted per share				$ 0.58
Packaging and Paper
Quarterly Financial Data [Line Items]
Restructuring charges		4,000,000.0	$ 3,300,000	$ 20,400,000					27,300,000
Restructuring charges, after tax		$ 3,000,000.0	$ 2,500,000	$ 15,300,000
Restructuring charges, diluted per share		$ 0.03	$ 0.03	$ 0.16
Packaging And Corporate And Other
Quarterly Financial Data [Line Items]
Restructuring charges						$ 400,000	$ 3,000,000.0	$ 600,000
Corrugated Products Facility Closure
Quarterly Financial Data [Line Items]
Restructuring charges					$ 400,000	300,000
Restructuring charges, after tax					$ 300,000	$ 200,000
Restructuring charges, diluted per share					$ 0.00	$ 0.00
COVID-19 | Packaging and Paper
Quarterly Financial Data [Line Items]
Incremental out-of-pocket costs				$ 6,100,000	$ 800,000				6,300,000
Incremental out-of-pocket costs, after tax				$ 4,600,000	$ 600,000
Incremental out-of-pocket costs, diluted per share				$ 0.05	$ 0.01
Hurricane Laura | DeRidder, Louisiana Mill
Quarterly Financial Data [Line Items]
Charges related to the impact of Hurricane Laura			$ 10,000,000.0						$ 10,000,000.0
Charges related to the impact of Hurricane Laura, after tax			$ 7,600,000
Charges related to the impact of Hurricane Laura, diluted per share			$ 0.08