INCOME TAXES - Reconciliation of Federal Statutory Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ (1,467.6)	$ (3,945.4)	$ (394.5)
Benefit for income taxes at statutory rate	(308.2)	(828.5)	(110.7)
State and local taxes—net of federal benefit	(28.0)	(28.5)	6.8
Foreign tax differentials	7.2	43.0	(22.7)
Change in valuation allowances	7.4	(0.8)	3.8
Change in unrecognized tax benefit	21.3	43.3	(26.7)
Tax Act	0.0	0.0	123.0
Permanent differences—net	14.3	5.0	(9.3)
Amortization on intercompany sale	0.0	0.0	1.9
Goodwill impairment	26.1	675.6	0.0
Gain on sale of business adjustment	(132.1)	0.0	0.0
Other	14.3	36.1	1.7
Benefit for income taxes from continued operations	$ (377.7)	$ (54.8)	$ (32.2)
Effective income tax rate	25.70%	1.40%	8.20%