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Marketable Investment Securities (Tables) | 3 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
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 September 30, 2016 and June 30, 2016 were as follows:
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
At September 30, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 61.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 61.1 |
Cash equivalents |  |  | 25.8 |  |  |  | — |  |  |  | — |  |  |  | 25.8 |
Total cash and cash equivalents |  |  | 86.9 |  |  |  | — |  |  |  | — |  |  |  | 86.9 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 45.4 |  |  |  | 0.1 |  |  |  | — |  |  |  | 45.5 |
Municipal bonds |  |  | 52.2 |  |  |  | 0.1 |  |  |  | — |  |  |  | 52.3 |
Federal agency issues |  |  | 12.6 |  |  |  | — |  |  |  | — |  |  |  | 12.6 |
US government securities |  |  | 3.3 |  |  |  | — |  |  |  | — |  |  |  | 3.3 |
Total |  | $ | 200.4 |  |  | $ | 0.2 |  |  | $ | — |  |  | $ | 200.6 |
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
At June 30, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 66.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 66.1 |
Cash equivalents |  |  | 2.4 |  |  |  | — |  |  |  | — |  |  |  | 2.4 |
Total cash and cash equivalents |  |  | 68.5 |  |  |  | — |  |  |  | — |  |  |  | 68.5 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 50.8 |  |  |  | 0.2 |  |  |  | — |  |  |  | 51.0 |
Municipal bonds |  |  | 85.4 |  |  |  | 0.2 |  |  |  | — |  |  |  | 85.6 |
Federal agency issues |  |  | 25.5 |  |  |  | — |  |  |  | — |  |  |  | 25.5 |
US government securities |  |  | 8.2 |  |  |  | 0.1 |  |  |  | — |  |  |  | 8.3 |
Total |  | $ | 238.4 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 238.9 |
Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale Securities | Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities are as follows at September 30, 2016:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Cash |  | $ | 61.1 |  |  | $ | 61.1 |
Cash equivalents |  |  | 25.8 |  |  |  | 25.8 |
Available-for-sale: |  |  |  |  |  |  |  |
Due within one year |  |  | 61.5 |  |  |  | 61.5 |
Due after one year through five years |  |  | 52.0 |  |  |  | 52.2 |
Due after five years |  |  | — |  |  |  | — |
Total |  | $ | 200.4 |  |  | $ | 200.6 |

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