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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
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]    
Weighted-average shares outstanding used to compute basic EPS 73.0 68.6
Effect of dilutive shares   1.8
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 73.0 70.4