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Net Income Per Share | 9 Months Ended
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Mar. 31, 2017
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 |  |  | Nine Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 4.5 |  |  | $ | 20.5 |  |  | $ | 31.0 |  |  | $ | 79.3 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares, basic |  |  | 34.8 |  |  |  | 36.8 |  |  |  | 34.9 |  |  |  | 36.7 |
Effect of dilutive share-based awards |  |  | 0.6 |  |  |  | 1.1 |  |  |  | 0.8 |  |  |  | 1.3 |
Shares, diluted |  |  | 35.4 |  |  |  | 37.9 |  |  |  | 35.7 |  |  |  | 38.0 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.13 |  |  | $ | 0.56 |  |  | $ | 0.89 |  |  | $ | 2.16 |
Diluted |  | $ | 0.13 |  |  | $ | 0.54 |  |  | $ | 0.87 |  |  | $ | 2.09 |
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, and market stock units, or MSUs. Dilutive net income per share amounts do not include the potential weighted average effect of 2,380,552 and 756,328 shares of common stock related to certain share-based awards that were outstanding during the three months ended March 31, 2017 and 2016, respectively, and 1,739,783 and 894,251 shares of common stock related to certain share-based awards that were outstanding during the nine months ended March 31, 2017 and 2016, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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