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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, 2015 | Jun. 30, 2014 | Jun. 30, 2013
Stockholders Equity [Line Items] |  |  |
Shares purchased and retired | 6.0 | 10.4 | 5.6
Common stock and additional paid-in-capital reductions | $ 51.5 | $ 82.5 | $ 42.7
Charges to retained earnings | $ 159.2 | $ 205.1 | $ 103.6
Common Stock |  |  |
Stockholders Equity [Line Items] |  |  |
Shares purchased and retired | 6.0 | 10.4 | 5.6

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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