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EARNINGS PER SHARE
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Net earnings attributable to W.W. Grainger, Inc. as reported
$
185,873

 
$
192,201

 
$
545,262

 
$
623,764

Distributed earnings available to participating securities
(547
)
 
(676
)
 
(1,749
)
 
(2,187
)
Undistributed earnings available to participating securities
(1,085
)
 
(1,138
)
 
(3,179
)
 
(4,012
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
184,241

 
190,387

 
540,334

 
617,565

Undistributed earnings allocated to participating securities
1,085

 
1,138

 
3,179

 
4,012

Undistributed earnings reallocated to participating securities
(1,078
)
 
(1,129
)
 
(3,157
)
 
(3,972
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
184,248

 
$
190,396

 
$
540,356

 
$
617,605

Denominator for basic earnings per share – weighted average shares
60,016,550

 
64,720,037

 
60,854,548

 
66,188,236

Effect of dilutive securities
399,601

 
569,107

 
413,571

 
661,530

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
60,416,151

 
65,289,144

 
61,268,119

 
66,849,766

Earnings per share two-class method
 

 
 

 
 
 
 
Basic
$
3.07

 
$
2.94

 
$
8.88

 
$
9.33

Diluted
$
3.05

 
$
2.92

 
$
8.82

 
$
9.24