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STOCK-BASED COMPENSATION - Shareholder Return Market Condition and Assumptions (Details) - Performance Units
6 Months Ended
Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend yield 0.00%
Risk-free rate 4.50%
Expected term (in years) 2 years 9 months 14 days
Expected volatility (TreeHouse Foods, Inc.)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected volatility 34.34%
Expected volatility (Peer Group)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected volatility 33.56%