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Marketable Investment Securities (Tables) | 12 Months Ended
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Jun. 30, 2015
Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security | The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at June 30, 2015 and 2014 were as follows:
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
At June 30, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 54.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 54.7 |
Cash equivalents |  |  | 9.4 |  |  |  | — |  |  |  | — |  |  |  | 9.4 |
Total cash and cash equivalents |  |  | 64.1 |  |  |  | — |  |  |  | — |  |  |  | 64.1 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 41.8 |  |  |  | — |  |  |  | — |  |  |  | 41.8 |
Municipal bonds |  |  | 66.3 |  |  |  | 0.1 |  |  |  | (0.1 | ) |  |  | 66.3 |
Federal agency issues |  |  | 13.2 |  |  |  | — |  |  |  | — |  |  |  | 13.2 |
Total |  | $ | 185.4 |  |  | $ | 0.1 |  |  | $ | (0.1 | ) |  | $ | 185.4 |
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
At June 30, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 45.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 45.2 |
Cash equivalents |  |  | 19.6 |  |  |  | — |  |  |  | — |  |  |  | 19.6 |
Total cash and cash equivalents |  |  | 64.8 |  |  |  | — |  |  |  | — |  |  |  | 64.8 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 44.5 |  |  |  | — |  |  |  | — |  |  |  | 44.5 |
Municipal bonds |  |  | 137.8 |  |  |  | 0.3 |  |  |  | — |  |  |  | 138.1 |
Federal agency issues |  |  | 23.1 |  |  |  | — |  |  |  | — |  |  |  | 23.1 |
Total |  | $ | 270.2 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 270.5 |
Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale | Cash, cash equivalents, and maturities of debt securities classified as available-for-sale are as follows at June 30, 2015:
|  | Amortized cost |  |  | Estimated fair value |
Cash |  | $ | 54.7 |  |  | $ | 54.7 |
Cash equivalents |  |  | 9.4 |  |  |  | 9.4 |
Available-for-sale: |  |  |  |  |  |  |  |
Due within one year |  |  | 80.7 |  |  |  | 80.7 |
Due after one year through five years |  |  | 40.6 |  |  |  | 40.6 |
Due after five years |  |  | — |  |  |  | — |
Total |  | $ | 185.4 |  |  | $ | 185.4 |
Schedule of Debt Securities Available-For-Sale in Gross Unrealized Loss Position | Debt securities available-for-sale in a gross unrealized loss position as of June 30, 2015 and 2014 are summarized as follows:
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
At June 30, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 24.4 |  |  |  | (0.0 | ) |  |  | — |  |  |  | — |  |  |  | 24.4 |  |  |  | (0.0 | )
Municipal bonds |  |  | 24.8 |  |  |  | (0.1 | ) |  |  | — |  |  |  | — |  |  |  | 24.8 |  |  |  | (0.1 | )
Federal agency issues |  |  | 1.9 |  |  |  | (0.0 | ) |  |  | — |  |  |  | — |  |  |  | 1.9 |  |  |  | (0.0 | )
|  | $ | 51.1 |  |  | $ | (0.1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 51.1 |  |  | $ | (0.1 | )
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
At June 30, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 16.0 |  |  |  | (0.0 | ) |  |  | — |  |  |  | — |  |  |  | 16.0 |  |  |  | (0.0 | )
Municipal bonds |  |  | 8.6 |  |  |  | (0.0 | ) |  |  | — |  |  |  | — |  |  |  | 8.6 |  |  |  | (0.0 | )
Federal agency issues |  |  | 5.0 |  |  |  | (0.0 | ) |  |  | — |  |  |  | — |  |  |  | 5.0 |  |  |  | (0.0 | )
|  | $ | 29.6 |  |  | $ | (0.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | 29.6 |  |  | $ | (0.0 | )

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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