SEGMENT REPORTING - Segment Data (Details) $ in Millions	12 Months Ended
	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Number of operating segments | segment	3
Net revenues	$ 4,629.9	$ 4,717.8	$ 6,287.9
Depreciation and amortization	585.3	716.5	736.0
Operating (loss) income	(48.6)	(1,236.5)	(3,688.4)
Interest expense, net	235.1	242.7	225.2
Other (income) expense, net	(43.9)	(11.6)	31.8
Loss from continuing operations before income taxes	(239.8)	(1,467.6)	(3,945.4)
Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	585.3	584.7	578.5
Operating Segments | Americas
Segment Reporting Information [Line Items]
Net revenues	1,866.9	1,771.0	2,248.9
Operating (loss) income	36.5	(164.8)	(1,474.5)
Operating Segments | Americas | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	255.7	227.4	188.4
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Net revenues	2,183.7	2,308.6	2,909.7
Operating (loss) income	129.8	(248.4)	(1,344.1)
Operating Segments | EMEA | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	259.9	276.0	272.0
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Net revenues	579.3	582.7	771.1
Operating (loss) income	(13.2)	(74.0)	(253.1)
Operating Segments | Asia Pacific | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	69.7	69.5	63.3
Operating Segments | Other
Segment Reporting Information [Line Items]
Operating (loss) income	0.0	(10.9)	(18.6)
Other | Other
Segment Reporting Information [Line Items]
Net revenues	0.0	55.5	358.2
Other | Other | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	0.0	11.8	54.8
Corporate
Segment Reporting Information [Line Items]
Operating (loss) income	$ (201.7)	$ (738.4)	$ (598.1)