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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 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
 
March 31,
 
2016
 
2015
Net earnings attributable to W.W. Grainger, Inc. as reported
$
186,713

 
$
211,015

Distributed earnings available to participating securities
(626
)
 
(768
)
Undistributed earnings available to participating securities
(1,121
)
 
(1,461
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
184,966

 
208,786

Undistributed earnings allocated to participating securities
1,121

 
1,461

Undistributed earnings reallocated to participating securities
(1,114
)
 
(1,445
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
184,973

 
$
208,802

Denominator for basic earnings per share – weighted average shares
61,668,682

 
67,229,653

Effect of dilutive securities
431,119

 
752,709

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
62,099,801

 
67,982,362

Earnings per share two-class method
 

 
 

Basic
$
3.00

 
$
3.11

Diluted
$
2.98

 
$
3.07