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Preferred and Common Stockholder's Equity (Tables) | 12 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Summary of Common Shares Issued and Outstanding | Common shares issued and outstanding
|  | Years Ended June 30, |
|  |  | 2018 |  |  |  | 2017 |  |  |  | 2016 |
Common stock issued and outstanding at July 1 |  |  | 68.4 |  |  |  | 69.1 |  |  |  | 68.9 |
Common stock issued upon exercise of options and employee stock plans |  |  | 2.2 |  |  |  | 0.9 |  |  |  | 4.7 |
Repurchase and retirement of common stock |  |  | — |  |  |  | (1.6 | ) |  |  | (4.5 | )
Common stock issued and outstanding at June 30 |  |  | 70.6 |  |  |  | 68.4 |  |  |  | 69.1 |
Schedule of Stock Repurchases | The shares retired, aggregate common stock and additional paid-in capital reductions, and related charges to retained earnings/accumulated deficit for the repurchases for periods ended June 30, 2018, 2017 and 2016 were as follows:
|  | Year ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Shares purchased and retired |  |  | - |  |  |  | 1.6 |  |  |  | 4.5 |
Common stock and additional paid-in-capital reductions |  | $ | - |  |  | $ | 14.6 |  |  | $ | 41.2 |
Charges to retained earnings |  | $ | - |  |  | $ | 17.0 |  |  | $ | 121.4 |

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