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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Stockholders Equity [Line Items]      
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
Common Stock [Member]      
Stockholders Equity [Line Items]      
Shares purchased and retired 1.6 4.5 6.0