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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2013
Notes to Financial Statements [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE
 
The following table sets forth the computation of basic and diluted earnings per share under the two-class method (in thousands of dollars, except for share and per share amounts):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2013
 
2012
 
2013
 
2012
Net earnings attributable to W.W. Grainger, Inc. as reported
$
217,660

 
$
190,704

 
$
429,498

 
$
378,220

Distributed earnings available to participating securities
(826
)
 
(996
)
 
(1,717
)
 
(1,706
)
Undistributed earnings available to participating securities
(2,265
)
 
(2,503
)
 
(5,006
)
 
(5,143
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
214,569

 
187,205

 
422,775

 
371,371

Undistributed earnings allocated to participating securities
2,265

 
2,503

 
5,006

 
5,143

Undistributed earnings reallocated to participating securities
(2,230
)
 
(2,455
)
 
(4,925
)
 
(5,041
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
214,604

 
$
187,253

 
$
422,856

 
$
371,473

Denominator for basic earnings per share – weighted average shares
69,664,697

 
69,937,085

 
69,613,947

 
70,034,142

Effect of dilutive securities
1,136,353

 
1,370,555

 
1,174,256

 
1,446,535

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
70,801,050

 
71,307,640

 
70,788,203

 
71,480,677

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
3.08

 
$
2.68

 
$
6.07

 
$
5.30

Diluted
$
3.03

 
$
2.63

 
$
5.97

 
$
5.20