Third Quarter Ended

Nine Months Ended

September 30

(millions, except per share)

2011

2010

2011

2010

Net income attributable to Ecolab

$

154.3

$

174.2

$

373.8

$

399.0

Weighted-average common shares outstanding

Basic

231.9

232.8

231.8

233.8

Effect of dilutive stock options and awards

4.2

4.4

4.2

Diluted

236.1

237.0

236.2

238.0

Earnings attributable to Ecolab per common share

Basic

$

0.67

$

0.75

$

1.61

$

1.71

Diluted

$

0.65

$

0.74

$

1.58

$

1.68

Anti-dilutive securities excluded from computation of earnings per share

2.1

4.3

2.0

4.4