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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
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