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Preferred and Common Stockholder's Equity (Tables) | 12 Months Ended
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Jun. 30, 2017
Equity [Abstract] |
Summary of Common Shares Issued and Outstanding | Common shares issued and outstanding
|  | Years Ended June 30, |
|  |  | 2017 |  |  |  | 2016 |  |  |  | 2015 |
Common stock issued and outstanding at July 1 |  |  | 69.1 |  |  |  | 68.9 |  |  |  | 73.5 |
Common stock issued upon exercise of options and employee stock plans |  |  | 0.9 |  |  |  | 4.7 |  |  |  | 1.4 |
Repurchase and retirement of common stock |  |  | (1.6 | ) |  |  | (4.5 | ) |  |  | (6.0 | )
Common stock issued and outstanding at June 30 |  |  | 68.4 |  |  |  | 69.1 |  |  |  | 68.9 |
Schedule of Stock Repurchases | The shares retired, aggregate common stock and additional paid-in capital reductions, and related charges to accumulated deficit for the repurchases for periods ended June 30, 2017, 2016 and 2015 were as follows:
|  | Year ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Shares purchased and retired |  |  | 1.6 |  |  |  | 4.5 |  |  |  | 6.0 |
Common stock and additional paid-in-capital reductions |  | $ | 14.6 |  |  | $ | 41.2 |  |  | $ | 51.5 |
Charges to retained earnings |  | $ | 17.0 |  |  | $ | 121.4 |  |  | $ | 159.2 |

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