EQUITY - Issuance of Series A Preferred Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Nov. 16, 2017	Mar. 27, 2017	Feb. 16, 2017	Nov. 25, 2016	Apr. 30, 2015
Class of Stock [Line Items]
Number of Shares Awarded at Grant Date (millions of shares)	5.0	4.2
Number of Shares Outstanding (millions of shares)	5.0	4.2
Series A Preferred Stock - April 2015 - 1
Class of Stock [Line Items]
Number of Shares Awarded at Grant Date (millions of shares)								6.8
Number of Shares Outstanding (millions of shares)								1.1
Hurdle Price per Share								$ 27.97
Series A Preferred Stock - April 2015 - 2
Class of Stock [Line Items]
Number of Shares Awarded at Grant Date (millions of shares)								0.6
Number of Shares Outstanding (millions of shares)								0.6
Hurdle Price per Share								$ 26.87
Series A Preferred Stock
Class of Stock [Line Items]
Number of Shares Awarded at Grant Date (millions of shares)				1.0	1.0	0.5	1.0
Number of Shares Outstanding (millions of shares)	5.0			1.0	1.0	0.3	1.0
Hurdle Price per Share				$ 19.85	$ 22.39	$ 22.66	$ 22.34
Selling, General and Administrative
Class of Stock [Line Items]
Share-based compensation expense	$ 33.4	$ 29.0	$ 35.4
Selling, General and Administrative | Series A Preferred Stock
Class of Stock [Line Items]
Share-based compensation expense	$ (1.7)	$ 3.8