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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Stockholders Equity [Line Items] |  |  |
Shares purchased and retired | 4.5 | 6.0 | 10.4
Common stock and additional paid-in-capital reductions | $ 41.2 | $ 51.5 | $ 82.5
Charges to retained earnings | $ 121.4 | $ 159.2 | $ 205.1
Common Stock |  |  |
Stockholders Equity [Line Items] |  |  |
Shares purchased and retired | 4.5 | 6.0 | 10.4

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