| Document and Entity Information | Aug. 01, 2019 |
| Cover page. | |
| Amendment Description | On August 2, 2019, TreeHouse Foods, Inc. (NYSE: THS) filed with the Securities and Exchange Commission a Current Report on Form 8-K (the "Original Form 8-K") to disclose pro forma information required by Item 2.01 and additional Non-GAAP information not otherwise required by Item 2.01 upon completion of the divestiture of a significant business. This Amendment No. 1 on Form 8-K/A amends the Original Form 8-K to refurnish Exhibit 99.2 in order to update the following: amount of "Income tax (benefit) expense" for the year ended December 31, 2017 from $(141.8 million) to $(37.4 million) on page 3 of the Exhibit, to update the amount of "Interest expense" for the year ended December 31, 2017 from $126.8 million to $123.5 million on page 3 of the Exhibit, to update the amount of "Interest expense" for the year ended December 31, 2018 from $114.6 million to $112.2 million on page 3 of the Exhibit, and to make corresponding changes to the subsequent line items in the "Reconciliation of Net (Loss) Income From Continuing Operations to Adjusted Net Income, Adjusted EBIT, and Adjusted EBITDAS From Continuing Operations" table. In addition, the Company updated the number of shares listed in Footnote 2 to the "Reconciliation of Diluted (Loss) Income Per Share From Continuing Operations To Adjusted Diluted EPS From Continuing Operations" table on Page 3 of Exhibit 99.2 for the year ended December 31, 2018 from 57.6 million to 56.5 million. Exhibit 99.2 to the Original Form 8-K, as corrected, is furnished as Exhibit 99.2 hereto, and supersedes in its entirety Exhibit 99.2 to the Original Form 8-K. |
| Document Type | 8-K/A |
| Document Period End Date | Aug. 1, 2019 |
| Entity Registrant Name | TREEHOUSE FOODS, INC. |
| Entity File Number | 001-32504 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 20-2311383 |
| Entity Address, Address Line One | 2021 Spring RoadSuite 600 |
| Entity Address, City or Town | Oak Brook |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60523 |
| City Area Code | 708 |
| Local Phone Number | 483-1300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | THS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001320695 |
| Amendment Flag | true |
