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Marketable Investment Securities | 6 Months Ended
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Dec. 31, 2017
Investments Debt And Equity Securities [Abstract] |
Marketable Investment Securities |
(3) | MARKETABLE INVESTMENT SECURITIES
The Company has classified its marketable investment securities as available-for-sale securities. These securities are carried at estimated fair value with unrealized holding gains and losses, net of the related tax effect, included in accumulated other comprehensive loss in stockholders’ equity until realized. Gains and losses on investment security transactions are reported on the specific-identification method. Dividend and interest income are recognized when earned. 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 |
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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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