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Earnings Per Share (Notes)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE

We compute basic earnings per share by dividing net earnings attributable to Tesoro Corporation stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share include the effects of potentially dilutive shares outstanding during the period. Our share calculations are presented below (in millions):
 
Three Months Ended
March 31,
 
 
2015
 
2014
Weighted average common shares outstanding
125.2

 
131.3
Common stock equivalents
1.7

 
2.5
Total diluted shares
126.9

 
133.8


Potentially dilutive common stock equivalents are excluded from the calculation of diluted earnings per share if the effect of including such securities in the calculation would have been anti-dilutive. Anti-dilutive securities were 0.3 million and 0.4 million for the three months ended March 31, 2015 and 2014, respectively.