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Earnings Per Share
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
The following table shows a reconciliation of the numerators and denominators used in calculating basic and diluted earnings per share.
(In millions, except per share amounts)
2013
 
2012
 
2011
Numerators
 
 
 
 
 
Net income attributable to W. R. Grace & Co. shareholders
$
256.1

 
$
40.0

 
$
219.7

Denominators
 
 
 
 
 
Weighted average common shares—basic calculation
76.4

 
74.9

 
73.6

Dilutive effect of employee stock options
1.3

 
1.4

 
1.9

Weighted average common shares—diluted calculation
77.7

 
76.3

 
75.5

Basic earnings per share
$
3.35

 
$
0.53

 
$
2.99

Diluted earnings per share
$
3.30

 
$
0.52

 
$
2.91


There were approximately 0.3 million, 0.4 million and 1.3 million anti-dilutive options outstanding for the years ended December 31, 2013, 2012 and 2011, respectively. The effect of the warrant for 10 million shares issued under the Joint Plan, as discussed in Note 2, is not included in diluted earnings per share.