INCOME TAXES - Reconciliation of Federal statutory tax rate to effective tax rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 138.8	$ 233.3	$ (44.1)
Provision (benefit) for income taxes at statutory rate	48.5	81.7	(15.4)
State and local taxes—net of federal benefit	(8.3)	(5.6)	0.9
Foreign tax differentials	(50.8)	(74.4)	(53.0)
Change in valuation allowances	(7.6)	(6.6)	36.1
Change in unrecognized tax benefit	45.8	(16.0)	(24.4)
Asset impairment charges	0.0	0.0	67.4
U.S. audit settlement, net	(83.2)	(19.2)	0.0
Share-based compensation	0.0	0.0	1.8
Permanent differences—net	4.7	10.6	1.8
Amortization on intercompany sale	5.7	0.0	0.0
Other	4.8	3.4	4.9
(Benefit) provision for income taxes	$ (40.4)	$ (26.1)	$ 20.1
Effective income tax rate	(29.10%)	(11.20%)	(45.60%)