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Marketable Investment Securities (Tables) | 6 Months Ended
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Dec. 31, 2017
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 December 31, 2017 and June 30, 2017 were as follows:
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  |  |  |  |  | unrealized |  |  | unrealized |  |  |  |  |
|  | Amortized |  |  | holding |  |  | holding |  |  | Estimated |
|  | cost |  |  | gains |  |  | losses |  |  | fair value |
At December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 85.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 85.9 |
Cash equivalents |  |  | 2.8 |  |  |  | — |  |  |  | — |  |  | $ | 2.8 |
Total cash and cash equivalents |  |  | 88.7 |  |  |  | — |  |  |  | — |  |  |  | 88.7 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 57.9 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 57.7 |
Municipal bonds |  |  | 34.9 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 34.8 |
Federal agency issues |  |  | 12.6 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 12.5 |
US government securities |  |  | 8.3 |  |  |  | — |  |  |  | — |  |  |  | 8.3 |
Total |  | $ | 202.4 |  |  | $ | — |  |  | $ | (0.4 | ) |  | $ | 202.0 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  |  |  |  |  | unrealized |  |  | unrealized |  |  |  |  |
|  | Amortized |  |  | holding |  |  | holding |  |  | Estimated |
|  | cost |  |  | gains |  |  | losses |  |  | fair value |
At June 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 83.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 83.5 |
Cash equivalents |  |  | 18.9 |  |  |  | — |  |  |  | — |  |  |  | 18.9 |
Total cash and cash equivalents |  |  | 102.4 |  |  |  | — |  |  |  | — |  |  |  | 102.4 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 45.4 |  |  |  | 0.1 |  |  |  | (0.1 | ) |  |  | 45.4 |
Municipal bonds |  |  | 32.7 |  |  |  | — |  |  |  | — |  |  |  | 32.7 |
Federal agency issues |  |  | 11.6 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 11.5 |
US government securities |  |  | 7.2 |  |  |  | — |  |  |  | — |  |  |  | 7.2 |
Total |  | $ | 199.3 |  |  | $ | 0.1 |  |  | $ | (0.2 | ) |  | $ | 199.2 |
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 December 31, 2017:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Cash |  | $ | 85.9 |  |  | $ | 85.9 |
Cash equivalents |  |  | 2.8 |  |  |  | 2.8 |
Available-for-sale: |  |  |  |  |  |  |  |
Due within one year |  |  | 54.9 |  |  |  | 54.8 |
Due after one year through five years |  |  | 58.8 |  |  |  | 58.5 |
Due after five years |  |  | — |  |  |  | — |
Total |  | $ | 202.4 |  |  | $ | 202.0 |

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