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Net Income Per Share (Tables) | 9 Months Ended
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Mar. 31, 2016
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 |  |  | Nine Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 20.5 |  |  | $ | 31.5 |  |  | $ | 79.3 |  |  | $ | 79.1 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares, basic |  |  | 36.8 |  |  |  | 36.7 |  |  |  | 36.7 |  |  |  | 36.8 |
Effect of dilutive share-based awards |  |  | 1.1 |  |  |  | 1.8 |  |  |  | 1.3 |  |  |  | 2.0 |
Shares, diluted |  |  | 37.9 |  |  |  | 38.5 |  |  |  | 38.0 |  |  |  | 38.8 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.56 |  |  | $ | 0.86 |  |  | $ | 2.16 |  |  | $ | 2.15 |
Diluted |  | $ | 0.54 |  |  | $ | 0.82 |  |  | $ | 2.09 |  |  | $ | 2.04 |

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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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