Share-Based Compensation - Schedule of Share-Based Compensation Arrangement by Share Based Payment Award Options Outstanding (Detail) shares in Millions	6 Months Ended
	Dec. 31, 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	(0.7)
Options canceled or expired, Number of shares | shares	0.0
Options outstanding at end of year, Number of shares | shares	5.6
Options exercisable at end of period, Number of shares | shares	5.6
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	24.17
Options canceled or expired, Weighted average exercise price | $ / shares	0
Options outstanding at end of year, Weighted average exercise price | $ / shares	24.54
Options exercisable at end of period, Weighted average exercise price | $ / shares	$ 24.54