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Net Income Per Share (Tables) | 6 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted 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, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | $ | (82.4 | ) |  | $ | 22.8 |  |  | $ | (108.9 | ) |  | $ | 26.5 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares, basic |  |  | 34.1 |  |  |  | 35.1 |  |  |  | 33.8 |  |  |  | 35.0 |
Effect of dilutive share-based awards |  |  | - |  |  |  | 0.8 |  |  |  | - |  |  |  | 0.7 |
Shares, diluted |  |  | 34.1 |  |  |  | 35.9 |  |  |  | 33.8 |  |  |  | 35.7 |
Net income/(loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (2.42 | ) |  | $ | 0.65 |  |  | $ | (3.22 | ) |  | $ | 0.76 |
Diluted |  | $ | (2.42 | ) |  | $ | 0.64 |  |  | $ | (3.22 | ) |  | $ | 0.74 |

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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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