Earnings Per Share (Notes)

6 Months Ended

Jun. 30, 2013

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.

Share calculations are presented below (in millions):

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Weighted average common shares outstanding	135.8	139.6	136.4	139.5
Common stock equivalents	2.4	0.9	2.5	1.7
Total diluted shares	138.2	140.5	138.9	141.2

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 as follows (in millions):

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Stock options	0.1	2.8	0.2	2.9