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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Stockholders Equity [Line Items]        
Shares purchased and retired     2.9 4.7
Common stock and additional paid-in-capital reductions $ 11.2 $ 15.2 $ 26.0 $ 40.2
Charges to retained earnings $ 33.3 $ 46.8 $ 81.9 $ 125.8
Common Stock        
Stockholders Equity [Line Items]        
Shares purchased and retired 1.2 1.8 2.9 4.7