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Earnings per Share | 6 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share Basic earnings per share is calculated by dividing net income by the weighted average number of shares outstanding during the reported period. The calculation of diluted earnings per share is similar to basic earnings per share, except that the weighted average number of shares outstanding includes the dilution from potential shares resulting from stock options, restricted stock awards and other stock awards. The components of basic and diluted earnings per share are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
In millions, except per share amounts | 2016 |  | 2015 |  | 2016 |  | 2015
Net income (loss) attributable to common stockholders | $ | 64 |  |  | $ | (265 | ) |  | $ | 18 |  |  | $ | (243 | )
Weighted average outstanding shares of common stock | 129.8 |  |  | 141.9 |  |  | 129.6 |  |  | 143.6 |
Dilutive effect of employee stock options, restricted stock and other stock awards | 1.7 |  |  | — |  |  | 1.6 |  |  | — |
Common stock and common stock equivalents | 131.5 |  |  | 141.9 |  |  | 131.2 |  |  | 143.6 |
Income (loss) per share: |  |  |  |  |  |  |
Basic | $ | 0.49 |  |  | $ | (1.87 | ) |  | $ | 0.14 |  |  | $ | (1.69 | )
Diluted | $ | 0.49 |  |  | $ | (1.87 | ) |  | $ | 0.14 |  |  | $ | (1.69 | )
For the three and six months ended June 30, 2015, due to the net loss attributable to Teradata common stockholders, due to the goodwill impairment charge, potential common shares that would cause dilution, such as employee stock options, restricted stock and other stock awards, have been excluded from the diluted share count because their effect would have been anti-dilutive. For the three months ended June 30, 2015, the fully diluted shares would have been 144.4 million, and for the six months ended June 30, 2015, the fully diluted shares would have been 146.1 million. Options to purchase 5.1 million and 5.4 million shares of common stock for the three and six months ended June 30, 2016 and 2.9 million and 3 million shares of common stock for the three and six months ended June 30, 2015 were not included in the computation of diluted earnings per share because their exercise prices were greater than the average market price of the common shares for the period, and therefore would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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