INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 97.2	$ 80.0	$ 75.8
Amortized intangible assets write off	$ 0.0	$ 0.3
Customer relationships [member]
Acquired Finite Lived Intangible Assets [Line Items]
Customer relationship estimated life	15 years 1 month 6 days
Underlying rights [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Customer relationship estimated life	20 years
McLean Data Center
Acquired Finite Lived Intangible Assets [Line Items]
Unfavorable lease obligation	$ 9.8
Amortization of unfavorable lease	0.5
2019	1.6
2020	1.6
2021	1.6
2022	1.6
2023	1.6
2024	$ 1.3