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Share-Based Compensation - Schedule of Share-Based Compensation Arrangement by Share Based Payment Award Options Outstanding (Detail)
shares in Millions
 3 Months Ended
Sep. 30, 2018
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Options outstanding at beginning of period, Number of shares | shares 6.3
Options granted, Number of shares | shares 0.0
Options exercised, Number of shares | shares (0.6)
Options canceled or expired, Number of shares | shares 0.0
Options outstanding at end of year, Number of shares | shares 5.7
Options exercisable at end of period, Number of shares | shares 5.7
Options outstanding at beginning of period, Weighted average exercise price | $ / shares $ 24.50
Options granted, Weighted average exercise price | $ / shares 0
Options exercised, Weighted average exercise price | $ / shares 23.84
Options canceled or expired, Weighted average exercise price | $ / shares 0
Options outstanding at end of year, Weighted average exercise price | $ / shares 24.57
Options exercisable at end of period, Weighted average exercise price | $ / shares $ 24.57