INCOME TAXES - Reconciliation of Federal statutory tax rate to effective tax rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 233.3	$ (44.1)	$ 318.7
Provision (benefit) for income taxes at statutory rate	81.7	(15.4)	111.6
State and local taxes—net of federal benefit	(5.6)	0.9	3.5
Foreign tax differentials	(74.4)	(53.0)	(44.2)
Change in valuation allowances	(6.6)	36.1	18.2
Change in unrecognized tax benefit	(35.2)	(24.4)	4.8
Asset impairment charges	0.0	67.4	0.0
Share-based compensation	0.0	1.8	16.0
Permanent differences—net	10.6	1.8	7.2
Other	3.4	4.9	(0.3)
(Benefit) provision for income taxes	$ (26.1)	$ 20.1	$ 116.8
Effective income tax rate	(11.20%)	(45.60%)	36.60%