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Earnings Per Share (Tables) | 9 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share | The following is the computation of basic and diluted earnings per share (EPS) from continuing operations attributable to Ashland. Stock appreciation rights (SARs), stock options and warrants available to purchase shares outstanding for each reporting period whose grant price was greater than the average market price of Ashland Common Stock for each applicable period were not included in the computation of income from continuing operations per diluted share because the effect of these instruments would be antidilutive. The total number of these shares outstanding was approximately 1 million and 0.7 million at June 30, 2019 and 2018, respectively. Earnings per share is reported under the treasury stock method.
| Three months ended |  |  | Nine months ended |
| June 30 |  |  | June 30 |
(In millions, except per share data) | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic and diluted EPS - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 23 |  |  | $ | 11 |  |  | $ | (3 | ) |  | $ | 21 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic EPS - Weighted- average common shares outstanding |  | 61 |  |  |  | 63 |  |  |  | 63 |  |  |  | 63 |
Share based awards convertible to common shares (a) |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
Denominator for diluted EPS - Adjusted weighted- average shares and assumed conversions |  | 62 |  |  |  | 64 |  |  |  | 63 |  |  |  | 64 |
EPS from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.38 |  |  | $ | 0.18 |  |  | $ | (0.05 | ) |  | $ | 0.33 |
Diluted |  | 0.37 |  |  |  | 0.18 |  |  |  | (0.05 | ) |  |  | 0.32 |
| (a) | As a result of the loss from continuing operations attributable to Ashland during the nine months ended June 30, 2019, the effect of the share-based awards convertible to common shares would be antidilutive. In accordance with U.S. GAAP, these shares have been excluded from the diluted EPS calculation. |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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