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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Net earnings attributable to W.W. Grainger, Inc. as reported
$
172,676

 
$
220,548

 
$
359,389

 
$
431,563

Distributed earnings available to participating securities
(576
)
 
(742
)
 
(1,202
)
 
(1,510
)
Undistributed earnings available to participating securities
(970
)
 
(1,418
)
 
(2,092
)
 
(2,879
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
171,130

 
218,388

 
356,095

 
427,174

Undistributed earnings allocated to participating securities
970

 
1,418

 
2,092

 
2,879

Undistributed earnings reallocated to participating securities
(964
)
 
(1,404
)
 
(2,078
)
 
(2,850
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
171,136

 
$
218,402

 
$
356,109

 
$
427,203

Denominator for basic earnings per share – weighted average shares
60,891,298

 
66,652,130

 
61,278,981

 
66,939,110

Effect of dilutive securities
410,247

 
665,001

 
420,622

 
708,579

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
61,301,545

 
67,317,131

 
61,699,603

 
67,647,689

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
2.81

 
$
3.28

 
$
5.81

 
$
6.38

Diluted
$
2.79

 
$
3.25

 
$
5.77

 
$
6.32