EQUITY - Issuance of Series A Preferred Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Mar. 27, 2017	Feb. 16, 2017	Nov. 25, 2016
Class of Stock [Line Items]
Number of Shares Awarded at Grant Date (millions of shares)		4.2	1.7
Number of Shares Outstanding (millions of shares)		4.2	1.7
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Series A Preferred Stock
Class of Stock [Line Items]
Number of Shares Awarded at Grant Date (millions of shares)	7.4				1.0	0.5	1.0
Number of Shares Outstanding (millions of shares)	1.7	4.2			1.0	0.5	1.0
Hurdle Price per Share	$ 27.97				$ 22.39	$ 22.66	$ 22.34
Forfeited (in shares)	5.7
Preferred stock, par value (in dollars per share)	$ 0.01
Potential cash bonus	$ 3.00					$ 2.62	$ 2.60
Vested (in shares)	0.6	1.0
Selling, General and Administrative
Class of Stock [Line Items]
Share-based compensation expense		$ 29.0	$ 35.4	$ 35.9
Selling, General and Administrative | Series A Preferred Stock
Class of Stock [Line Items]
Share-based compensation expense		$ 3.8