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EARNINGS ATTRIBUTABLE TO ECOLAB PER COMMON SHARE ("EPS") (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Computations of the basic and diluted earnings attributable to Ecolab per share amounts        
Net income attributable to Ecolab $ 534.9 $ 524.2 $ 967.5 $ 926.7
Weighted-average common shares outstanding        
Basic (in shares) 280.7 283.5 281.3 283.4
Effect of dilutive stock options and units (in shares) 1.5 1.9 1.6 2.0
Diluted (in shares) 282.2 285.4 282.9 285.4
Earnings attributable to Ecolab per common share        
Basic (in dollars per share) $ 1.91 $ 1.85 $ 3.44 $ 3.27
Diluted EPS (in dollars per share) $ 1.90 $ 1.84 $ 3.42 $ 3.25
Anti-dilutive securities excluded from the computation of diluted EPS (in shares) 1.1 0.6 0.6 0.6