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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Stockholders Equity [Line Items]        
Shares purchased and retired     1.7 3.0
Common stock and additional paid-in-capital reductions $ 5.4 $ 14.8 $ 14.9 $ 25.0
Charges to retained earnings $ 20.0 $ 43.6 $ 48.5 $ 79.0
Common Stock        
Stockholders Equity [Line Items]        
Shares purchased and retired 0.6 1.7 1.7 3.0