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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [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,
 
2014
 
2013
 
2014
 
2013
Net earnings attributable to W.W. Grainger, Inc. as reported
$
205,915

 
$
217,660

 
$
422,568

 
$
429,498

Distributed earnings available to participating securities
(727
)
 
(826
)
 
(1,562
)
 
(1,717
)
Undistributed earnings available to participating securities
(1,666
)
 
(2,265
)
 
(3,765
)
 
(5,006
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
203,522

 
214,569

 
417,241

 
422,775

Undistributed earnings allocated to participating securities
1,666

 
2,265

 
3,765

 
5,006

Undistributed earnings reallocated to participating securities
(1,645
)
 
(2,230
)
 
(3,716
)
 
(4,925
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
203,543

 
$
214,604

 
$
417,290

 
$
422,856

Denominator for basic earnings per share – weighted average shares
68,453,602

 
69,664,697

 
68,576,232

 
69,613,947

Effect of dilutive securities
888,283

 
1,136,353

 
932,893

 
1,174,256

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
69,341,885

 
70,801,050

 
69,509,125

 
70,788,203

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
2.97

 
$
3.08

 
$
6.08

 
$
6.07

Diluted
$
2.94

 
$
3.03

 
$
6.00

 
$
5.97