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Earnings (loss) per share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Three Months Ended June 30, |  | Six Months Ended June 30,
In millions (except share and per share data) | 2017 |  | 2016 |  | 2017 |  | 2016
Net income (loss) attributable to Ingevity stockholders | $ | 32.1 |  |  | $ | 24.1 |  |  | $ | 51.1 |  |  | $ | 33.3 |
Basic and Diluted earnings (loss) per share (1) |  |  |  |  |  |  |
Basic earnings (loss) per share | $ | 0.76 |  |  | $ | 0.57 |  |  | $ | 1.21 |  |  | $ | 0.79 |
Diluted earnings (loss) per share | 0.76 |  |  | 0.57 |  |  | 1.21 |  |  | 0.79 |
Shares: (2) |  |  |  |  |  |  |
Weighted average number of shares of common stock outstanding - Basic | 42,145 |  |  | 42,102 |  |  | 42,136 |  |  | 42,102 |
Weighted average additional shares assuming conversion of potential common shares | 282 |  |  | 24 |  |  | 258 |  |  | 24 |
Shares - diluted basis | 42,427 |  |  | 42,126 |  |  | 42,394 |  |  | 42,126 |
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(1) | Diluted earnings (loss) per share is calculated using net income (loss) available to common stockholders divided by diluted weighted-average shares of common shares outstanding during each period, which includes the dilutive effect of outstanding equity awards. Basic and diluted earnings (loss) per share for the three and six months ended June 30, 2017 is calculated using the weighted average number of common shares outstanding for the period. Basic and diluted earnings (loss) per share for the three and six months ended June 30, 2016 is calculated using the weighted average number of common shares outstanding for the period beginning after the Distribution Date.
(2) | Shares are presented in thousands.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following average number of potential common shares were antidilutive and, therefore, were not included in the diluted earnings per share calculation:
| Three Months Ended June 30, |  | Six Months Ended June 30,
In thousands | 2017 |  | 2016 |  | 2017 |  | 2016
Average number of potential common shares - antidilutive | 94 |  |  | 157 |  |  | 132 |  |  | 157 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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