INCOME TAXES - Income (Loss) from Operations before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
United States	$ (434.4)	$ (960.3)	$ (2,003.5)
Foreign	194.6	(507.3)	(1,941.9)
Loss from continuing operations before income taxes	$ (239.8)	$ (1,467.6)	$ (3,945.4)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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