v3.26.1
FAIR VALUE MEASUREMENTS - Plan's fair value hierarchy for those assets measured at fair value on a recurring basis (Details) - ECOLAB SAVINGS PLAN AND ESOP - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
FAIR VALUE MEASUREMENTS    
Investment at fair value $ 4,467,957 $ 4,014,153
Common stock    
FAIR VALUE MEASUREMENTS    
Investment at fair value 598,967 595,958
Interest bearing cash    
FAIR VALUE MEASUREMENTS    
Investment at fair value 5,109 5,969
Registered investment companies    
FAIR VALUE MEASUREMENTS    
Investment at fair value 437,857 1,593,043
Common/collective trusts    
FAIR VALUE MEASUREMENTS    
Investment at fair value 3,426,024 1,819,183
Total    
FAIR VALUE MEASUREMENTS    
Investment at fair value 1,041,933 2,194,970
Total | Common stock    
FAIR VALUE MEASUREMENTS    
Investment at fair value 598,967 595,958
Total | Interest bearing cash    
FAIR VALUE MEASUREMENTS    
Investment at fair value 5,109 5,969
Total | Registered investment companies    
FAIR VALUE MEASUREMENTS    
Investment at fair value 437,857 1,593,043
Level 1    
FAIR VALUE MEASUREMENTS    
Investment at fair value 1,041,933 2,194,970
Level 1 | Common stock    
FAIR VALUE MEASUREMENTS    
Investment at fair value 598,967 595,958
Level 1 | Interest bearing cash    
FAIR VALUE MEASUREMENTS    
Investment at fair value 5,109 5,969
Level 1 | Registered investment companies    
FAIR VALUE MEASUREMENTS    
Investment at fair value 437,857 1,593,043
Net asset value per share | Common/collective trusts    
FAIR VALUE MEASUREMENTS    
Investment at fair value $ 3,426,024 $ 1,819,183