SEGMENT REPORTING (Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
SEGMENT REPORTING
Total Segment Adjusted EBITDA									$ 1,291.0	$ 1,116.8	$ 934.9
Interest expense	$ (77.8)	$ (75.3)	$ (73.1)	$ (73.6)	$ (71.5)	$ (63.0)	$ (53.7)	$ (53.3)	(299.8)	(241.5)	(220.1)
Depreciation and amortization expense	(176.2)	(191.2)	(195.9)	(184.1)	(181.3)	(155.7)	(131.4)	(138.5)	(747.4)	(606.9)	(516.3)
Transaction costs									(18.6)	(20.5)	(21.5)
Stock-based compensation									(96.7)	(114.1)	(155.9)
Loss on extinguishment of debt				(4.9)	(13.7)	(4.5)			(4.9)	(18.2)	(33.8)
Foreign currency gain/(loss) on intercompany loans	(22.4)	13.9	3.1	10.8	14.4	3.9	(17.4)	(11.2)	5.4	(10.3)	(53.8)
Non-cash loss on investments									(1.0)	(1.2)	(1.2)
Income/(loss) from operations before income taxes	$ 20.7	$ 44.3	$ 34.4	$ 28.6	$ 34.2	$ 27.6	$ 20.0	$ 22.3	$ 128.0	$ 104.1	$ (67.7)