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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Net earnings attributable to W.W. Grainger, Inc. as reported
$
97,921

 
$
172,676

 
$
272,665

 
$
359,389

Distributed earnings available to participating securities
(427
)
 
(576
)
 
(973
)
 
(1,202
)
Undistributed earnings available to participating securities
(217
)
 
(970
)
 
(1,159
)
 
(2,092
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
97,277

 
171,130

 
270,533

 
356,095

Undistributed earnings allocated to participating securities
217

 
970

 
1,159

 
2,092

Undistributed earnings reallocated to participating securities
(216
)
 
(964
)
 
(1,152
)
 
(2,078
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
97,278

 
$
171,136

 
$
270,540

 
$
356,109

Denominator for basic earnings per share – weighted average shares
58,012,731

 
60,891,298

 
58,363,416

 
61,278,981

Effect of dilutive securities
274,581

 
410,247

 
377,846

 
420,622

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
58,287,312

 
61,301,545

 
58,741,262

 
61,699,603

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
1.68

 
$
2.81

 
$
4.64

 
$
5.81

Diluted
$
1.67

 
$
2.79

 
$
4.61

 
$
5.77