v3.25.2
Cover - shares
shares in Millions
 6 Months Ended
Jun. 30, 2025
Jul. 25, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-32504  
Entity Registrant Name TreeHouse Foods, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-2311383  
Entity Address, Address Line One 2021 Spring Road,  
Entity Address, Address Line Two Suite 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  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol THS  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   50.5
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001320695  
Current Fiscal Year End Date --12-31