Share-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Number of Awards
Exercised (in shares)	(362,571)	(95,089)	(19,627)
Stock options
Number of Awards
Balance at the beginning of the period (in shares)	2,392,428	1,701,502	1,507,878
Granted (in shares)	252,545	907,141	277,769
Exercised (in shares)	(362,571)	(95,289)	(19,627)
Forfeited (in shares)	(25,915)	(80,926)	(64,518)
Expired (in shares)	(33,226)	(40,000)
Balance at the end of the period (in shares)	2,223,261	2,392,428	1,701,502
Number of awards, exercisable (in shares)	1,135,224
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 42.27	$ 43.35	$ 44.61
Granted (in dollars per share)	41.27	38.98	36.31
Exercised (in dollars per share)	35.70	23.21	25.12
Forfeited (in dollars per share)	45.27	44.35	47.98
Expired (in dollars per share)	63.12	55.12
Balance at the end of the period (in dollars per share)	42.88	$ 42.27	$ 43.35
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 46.26
Additional disclosures
Weighted Average Remaining Contractual Term	6 years 11 months
Weighted Average Remaining Contractual Term, Exercisable	5 years 7 months
Aggregate Intrinsic Value	$ 22.3
Aggregate Intrinsic Value, Exercisable	$ 8.0