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Earnings Attributable To Ecolab Per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Computations of the basic and diluted earnings attributable to Ecolab per share amounts    
Net income attributable to Ecolab $ 49.7 $ 93.6
Weighted-average common shares outstanding    
Basic (in shares) 291.5 232.0
Effect of dilutive stock options, units and awards (in shares) 6.4 3.9
Diluted (in shares) 297.9 235.9
Earnings attributable to Ecolab per common share    
Basic (in dollars per share) $ 0.17 $ 0.40
Diluted (in dollars per share) $ 0.17 $ 0.40
Anti-dilutive securities excluded from the computation of earnings per share (in shares) 3.3 4.7