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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, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Stockholders Equity [Line Items]        
Shares purchased and retired     1.6 1.7
Common stock and additional paid-in-capital reductions $ 5.4 $ 5.4 $ 14.5 $ 14.9
Charges to retained earnings $ 4.8 $ 20.0 $ 17.1 $ 48.5
Common Stock [Member]        
Stockholders Equity [Line Items]        
Shares purchased and retired 0.6 0.6 1.6 1.7