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Marketable Investment Securities (Tables) | 6 Months Ended
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Dec. 31, 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 December 31, 2016 and June 30, 2016 were as follows:
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
At December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 81.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 81.3 |
Cash equivalents |  |  | 26.8 |  |  |  | — |  |  |  | — |  |  |  | 26.8 |
Total cash and cash equivalents |  |  | 108.1 |  |  |  | — |  |  |  | — |  |  |  | 108.1 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 38.6 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 38.5 |
Municipal bonds |  |  | 55.7 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 55.6 |
Federal agency issues |  |  | 12.6 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 12.5 |
US government securities |  |  | 3.3 |  |  |  | — |  |  |  | — |  |  |  | 3.3 |
Total |  | $ | 218.3 |  |  | $ | — |  |  | $ | (0.3 | ) |  | $ | 218.0 |
|  | 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 December 31, 2016:
|  | Amortized cost |  |  | Estimated fair value |
Cash |  | $ | 81.3 |  |  | $ | 81.3 |
Cash equivalents |  |  | 26.8 |  |  |  | 26.8 |
Available-for-sale: |  |  |  |  |  |  |  |
Due within one year |  |  | 54.4 |  |  |  | 54.4 |
Due after one year through five years |  |  | 55.8 |  |  |  | 55.5 |
Due after five years |  |  | — |  |  |  | — |
Total |  | $ | 218.3 |  |  | $ | 218.0 |

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