INCOME TAXES - Income (Loss) from Operations before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
United States	$ (960.3)	$ (2,003.5)	$ (379.3)
Foreign	(507.3)	(1,941.9)	(15.2)
Loss from continuing operations before income taxes	$ (1,467.6)	$ (3,945.4)	$ (394.5)