EQUITY - Schedule of Share Repurchase Activities (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Equity, Class of Treasury Stock [Line Items]
Cost of shares repurchased (in millions)	$ 36.3	$ 794.9	$ 263.1
Common Class A
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in millions)	1.4	27.4	13.4
Cost of shares repurchased (in millions)	$ 36.3	$ 767.0	$ 263.1
Common Class A | Minimum
Equity, Class of Treasury Stock [Line Items]
Fair value of shares repurchased per share	$ 25.35	$ 25.10	$ 18.64
Common Class A | Maximum
Equity, Class of Treasury Stock [Line Items]
Fair value of shares repurchased per share	$ 27.40	$ 30.35	$ 21.99