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Preferred and Common Stockholder's Equity - Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]        
Weighted-average shares outstanding used to compute basic EPS 70.9 70.7 70.1 72.0
Effect of dilutive shares 2.6 3.2 3.1 3.1
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 73.5 73.9 73.2 75.1