INCOME TAXES - Reconciliation of Federal statutory tax rate to effective tax rate (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (44.1)	$ 318.7	$ (331.1)
(Benefit) provision for income taxes at statutory rate	(15.4)	111.6	(115.9)
State and local taxes—net of federal benefit	0.9	3.5	(15.9)
Foreign tax differentials	(53.0)	(44.2)	(51.9)
Change in valuation allowances	36.1	18.2	3.8
Change in unrecognized tax benefit	(24.4)	4.8	36.2
Asset impairment charges	67.4	0	80.1
Share-based compensation	1.8	16.0	27.9
Permanent differences—net	1.8	7.2	(2.5)
Other	4.9	(0.3)	0.4
Provision (benefit) for income taxes	$ 20.1	$ 116.8	$ (37.8)
Effective income tax rate	(45.60%)	36.60%	11.40%