| Cover Page - USD ($) | 12 Months Ended | ||
| Dec. 31, 2019 | Apr. 26, 2020 | Jun. 30, 2019 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Document Fiscal Year Focus | 2019 | ||
| Document Fiscal Period Focus | FY | ||
| Trading Symbol | LKSD | ||
| Entity Registrant Name | LSC Communications, Inc. | ||
| Entity Central Index Key | 0001669812 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Filer Category | Accelerated Filer | ||
| Entity Shell Company | false | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Common Stock, Shares Outstanding | 33,586,062 | ||
| Entity Public Float | $ 120,031,446 | ||
| Title of 12(g) Security | Common Stock (Par Value $0.01) | ||
| Entity File Number | 1-37729 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 36-4829580 | ||
| Entity Address, Address Line One | 191 N. Wacker Drive, Suite 1400, | ||
| Entity Address, City or Town | Chicago | ||
| Entity Address, State or Province | IL | ||
| Entity Address, Postal Zip Code | 60606 | ||
| City Area Code | 773 | ||
| Local Phone Number | 272-9200 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Amendment Description | This Amendment No. 1 to Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K for the fiscal year ended December 31, 2019 of LSC Communications, Inc. (“LSC,” “LSC Communications,” “we,” “our,” “us” and the “Company”), as originally filed with the Securities and Exchange Commission (the “SEC”) on March 2, 2020 (the “Original Form 10-K”). We are filing this Amendment to present the information required by Part III of Form 10-K that was previously omitted from the Original Form 10-K in reliance on General instruction G(3) to Form 10-K because a definitive proxy statement containing such information will not be filed within 120 days after the end of the Company’s fiscal year ended December 31, 2019. In addition, Item 15 of Part IV has been amended solely to include the currently dated certification of our principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. The certifications of our principal executive officer and principal financial officer are filed with this Amendment as Exhibits 31.3 and 31.4 hereto. Because financial statements have not been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. We are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment. Except as expressly set forth herein, this Amendment does not otherwise update information in the Original Form 10-K to reflect facts or events occurring subsequent to the file date of the Original Form 10-K. This Amendment should be read in conjunction with the Original Form 10-K. 2019 marked the third complete fiscal year since R. R. Donnelley & Sons Company (“RR Donnelley” or “RRD”) effected its separation into three independent public companies: Donnelley Financial Solutions, Inc., LSC and RR Donnelley. The separation (the “Separation”) was effected when RRD distributed on a pro rata basis to holders of its common stock at least 80% of the outstanding shares of LSC common stock. On October 30, 2018, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among Quad/Graphics, Inc. (“Quad”), QLC Merger Sub, Inc. and LSC to combine in an all-stock transaction with Quad (the “Merger”). The U.S. Department of Justice filed a lawsuit to enjoin the transaction in June 2019. In light of the significant time and resources that would have been required to defend the lawsuit coupled with the uncertainty of the outcome, it was determined that continuing to litigate against the Department of Justice was not in the best interests of the Company or our stockholders. On July 22, 2019, Quad and LSC entered into a letter agreement, pursuant to which the parties agreed to terminate the Merger Agreement. |
