Share-Based Compensation - Cash-Settled Performance Units (Details) - Cash-Settled Performance Units - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares outstanding beginning period (in shares)	51	0	0
Shares granted (in shares)	95	77	69
Shares vested (in shares)	(25)	(13)	(51)
Shares forfeited (in shares)	(89)	(13)	(18)
Shares outstanding ending period (in shares)	32	51	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, granted (dollars per share)	$ 13.17	$ 8.47	$ 8.05
Weighted average grant date fair value, vested and issued (dollars per share)	0.00	0.00	0.00
Weighted average grant date fair value, forfeited (dollars per share)	$ 12.43	$ 8.30	$ 8.12
Fair value of vested awards	$ 0.1	$ 0.2	$ 0.2
Payments made to settle vested performance share units	$ 0.2	$ 0.1	$ 0.3