BASIS OF PRESENTATION We prepared these consolidated financial statements in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information, the instructions to Form 10-Q and Article 10 of U.S. Securities and Exchange Commission (SEC) Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, these consolidated financial statements reflect all adjustments that are of a normal recurring nature necessary for a fair presentation of our results of operations, financial condition, and cash flows for the interim periods presented. The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. We base these estimates on historical experience and on various other assumptions that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying amounts of assets and liabilities that are not readily apparent from other sources. Our actual results may differ materially from these estimates. Significant estimates inherent in the preparation of our consolidated financial statements include, but are not limited to, accounting for sales and cost recognition, postretirement benefit plans, assets for the portion of environmental costs that are probable of future recovery and liabilities, evaluation of goodwill, investments and other assets for impairment, income taxes including deferred tax assets, fair value measurements and contingencies. The consolidated financial statements include the accounts of subsidiaries we control and variable interest entities if we are the primary beneficiary. We eliminate intercompany balances and transactions in consolidation. We close our books and records on the last Sunday of the calendar quarter, which was on September 27 for the third quarter of 2020 and September 29 for the third quarter of 2019, to align our financial closing with our business processes. The consolidated financial statements and tables of financial information included herein are labeled based on that convention. This practice only affects interim periods as our fiscal year ends on December 31. We adopted Accounting Standards Update (ASU) 2016-13, Financial InstrumentsCredit Losses (Topic 326) : Measurement of Credit Losses on Financial Instruments , effective January 1, 2020 using the modified retrospective approach. The new standard changes how we account for credit losses for financial assets and certain other instruments, including trade receivables and contract assets, that are not measured at fair value through net income. Under legacy standards, we recognized an impairment of receivables when it was probable that a loss had been incurred. Under the new standard, we are required to recognize estimated credit losses expected to occur over the estimated life or remaining contractual life of an asset (which includes losses that may be incurred in future periods) using a broader range of information including reasonable and supportable forecasts about future economic conditions. The adoption of the standard did not have a significant impact on our results of operations, financial position or cash flows. We adopted ASU 2018-14, CompensationRetirement BenefitsDefined Benefit PlansGeneral (Topic 715-20): Disclosure FrameworkChanges to the Disclosure Requirements For Defined Benefit Plans , effective January 1, 2020. The new standard modifies the annual disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The guidance requires disclosure changes to be presented on a retrospective basis. As this standard relates only to financial disclosures, its adoption did not have an impact to our results of operations, financial position or cash flows. The results of operations for the interim periods presented are not necessarily indicative of results to be expected for the full year or future periods. Unless otherwise noted, we present all per share amounts cited in these consolidated financial statements on a per diluted share basis. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2019 (2019 Form 10-K).