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Net Income Per Share | 6 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Income Per Share | 3. Net Income Per Share The computation of basic and diluted net income per share was as follows (in millions, except per share data):
|  | Three Months Ended |  |  | Six Months Ended |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | $ | 12.8 |  |  | $ | (82.4 | ) |  | $ | 16.6 |  |  | $ | (108.9 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares, basic |  |  | 34.5 |  |  |  | 34.1 |  |  |  | 34.8 |  |  |  | 33.8 |
Effect of dilutive share-based awards |  |  | 0.6 |  |  |  | — |  |  |  | 0.8 |  |  |  | — |
Shares, diluted |  |  | 35.1 |  |  |  | 34.1 |  |  |  | 35.6 |  |  |  | 33.8 |
Net income/(loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.37 |  |  | $ | (2.42 | ) |  | $ | 0.48 |  |  | $ | (3.22 | )
Diluted |  | $ | 0.36 |  |  | $ | (2.42 | ) |  | $ | 0.47 |  |  | $ | (3.22 | )
Our basic net income per share amounts for each period presented have been computed using the weighted average number of shares of common stock outstanding over the period measured. Our diluted net income per share amounts for each period presented include the weighted average effect of potentially dilutive shares. We use the “treasury stock” method to determine the dilutive effect of our stock options, deferred stock units, or DSUs, market stock units, or MSUs, performance stock units, or PSUs, and our convertible notes. Dilutive net income per share amounts do not include the potential weighted average effect of 1,736,456 and 3,334,776 shares of common stock related to certain share-based awards that were outstanding during the three months ended December 31, 2018 and 2017, respectively, and 1,426,365 and 3,020,056 shares of common stock related to certain share-based awards that were outstanding during the six months ended December 31, 2018, and 2017, respectively. These share-based awards were not included in the computation of diluted net income per share because their effect would have been antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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