INCOME TAXES - Reconciliation of Federal statutory tax rate to effective tax rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (658.0)	$ 138.8	$ 233.3
(Benefit) provision for income taxes at statutory rate	(230.3)	48.5	81.7
State and local taxes—net of federal benefit	(15.0)	(8.3)	(5.6)
Foreign tax differentials	53.3	(50.8)	(74.4)
Change in valuation allowances	(108.2)	(7.6)	(6.6)
Change in unrecognized tax benefit	25.6	45.8	(16.0)
U.S. audit settlement, net	0.0	(83.2)	(19.2)
Permanent differences—net	1.2	4.7	10.6
Amortization on intercompany sale	5.7	5.7	0.0
Other	8.2	4.8	3.4
Benefit for income taxes	$ (259.5)	$ (40.4)	$ (26.1)
Effective income tax rate	39.40%	(29.10%)	(11.20%)