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Marketable Securities (Tables) | 9 Months Ended
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Mar. 31, 2012
Marketable Securities [Abstract] |
Summary Of Marketable Securities Classified As Available-For-Sale Securities |
March 31, 2012 |  | Cost |  |  | Unrealized Losses |  |  | Estimated Fair Value |
($ in millions) |  |  |
Non-current |  |  |  |  |  |  |  |  |  |  |  |
Municipal auction rate securities |  | $ | 6.1 |  |  | $ | (1.0 | ) |  | $ | 5.1 |
June 30, 2011 |  | Cost |  |  | Unrealized Losses |  |  | Estimated Fair Value |
($ in millions) |  |  |
Current |  |  |  |  |  |  |  |  |  |  |  |
Government agency bonds |  | $ | 13.7 |  |  | $ | — |  |  | $ | 13.7 |
Corporate bonds |  |  | 15.1 |  |  |  | — |  |  |  | 15.1 |
Commercial paper |  |  | 1.7 |  |  |  | — |  |  |  | 1.7 |
|  | $ | 30.5 |  |  | $ | — |  |  | $ | 30.5 |
Non-current |  |  |  |  |  |  |  |  |  |  |  |
Municipal auction rate securities |  | $ | 6.1 |  |  | $ | (0.8 | ) |  | $ | 5.3 |

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- Definition Schedule of Marketable Securities Classified as Available-For-Sales Securities [Table Text Block] + References No definition available. + Details
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- Details
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