INCOME TAXES (Reconciliation of Income Tax Provision) (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
INCOME TAXES
Expected provision/(benefit) at the statutory rate									$ 35.9	$ 36.4	$ (23.8)
Stock-based compensation									3.8	(11.7)	27.9
State income tax expense, net of federal benefit									3.2	2.9	(2.1)
Transaction costs not deductible for U.S. federal income tax purposes									0.4	1.9	1.5
Change in statutory tax rate, non-U.S.									7.4	(1.4)	(3.6)
Change in valuation allowance									(49.3)	(10.2)	2.8
State NOL expirations									6.1
U.S. Tax Reform	$ (23.9)	$ 4.6	$ 44.1						24.8
Foreign tax rate differential									(2.4)	(3.9)	2.7
Other, net									(3.8)	4.4	3.1
Provision for income taxes	$ (23.1)	$ 20.9	$ 22.9	$ 5.4	$ 11.0	$ 0.6	$ 0.2	$ 6.6	$ 26.1	$ 18.4	$ 8.5