Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2024
Accounting Policies [Abstract]
Nature of Operations and Basis of Presentation	Description of Business and Basis of Presentation Description of Business Clearwater Paper Corporation (the “Company,” “our” or “we”) is a premier manufacturer and supplier of bleached paperboard focused on servicing independent converters in North America. We also offer services that include customer sheeting, slitting, and cutting. Prior to the completion of the sale of our consumer products division, we manufactured and sold consumer and parent roll tissues to major retailers, including grocery, club and discount stores. On May 1, 2024, we completed the acquisition of a paperboard manufacturing facility and associated business in Augusta Georgia. See Note 3 Business Acquisition for more information about the acquisition. On July 21, 2024, we signed a binding agreement with Sofidel America to sell our consumer products division. This anticipated sale represents a strategic shift in our operations and financial results resulting in discontinued operations accounting treatment associated with this division. For all periods presented, the operating results associated with the consumer products division have been reclassified to discontinued operations and have been shown as net income from discontinued operations, net of taxes. The assets and liabilities associated with these businesses have been reflected as current and long-term assets and liabilities of discontinued operations in the Consolidated Balance Sheets. Additionally, certain reclassifications have been made to our continuing business to reflect certain intercompany transactions between the consumer products division and our remaining entity such as treatment of intercompany sales and cost inputs. For the three and nine months ended September 30, 2023, the impact of this reclassification was an increase to net sales of $18.3 million and $58.8 million and an increase to cost of sales of $18.4 million and $58.9 million. See Note 4, Discontinued Operation for more information on the divestiture. Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, in the opinion of management, include all adjustments (consisting of normal recurring adjustments) necessary to present fairly, in all material respects, the consolidated financial position, results of operations, stockholders' equity and cash flows for us and our subsidiaries for the interim periods presented. Results of operations for interim periods are not necessarily indicative of results to be expected for an entire year. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. All dollar amounts are shown in millions, except per share. Reportable Segment Effective July 21, 2024, we have determined that we have one reportable segment. This reportable segment aligns with the Company's business strategy, and the manner in which the Chief Executive Officer, the Company's chief operating decision maker, assesses performance and makes decisions regarding the allocation of resources for the Company. We manage our operations as a single segment for the purposes of assessing performance and making operating decisions. Discontinued Operations We present discontinued operations when there is a plan to dispose of a component of an entity or a group of components of an entity if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. In the period in which the component meets held-for-sale or discontinued operations criteria, the major assets and liabilities are reported as components of total assets and liabilities separate from those balances of the continuing operations. At the same time, the results of all discontinuing operations, less applicable income taxes, are reported as components of net income (loss) separate from the net income (loss) from continuing operations. Additionally, we have elected to allocate interest expense to discontinued operations related to debt that was not directly attributed to the division being disposed of. Interest expense was allocated based on a ratio of net assets of discontinued operations to the consolidated net assets plus consolidated debt.