SEGMENT REPORTING - Reporting Segments (Details) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 segment	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	4		3
Number of operating segments \| segment	4		3
Net revenues	$ 1,528.0	$ 1,990.6		$ 5,815.8	$ 6,533.1
Operating (loss) income	(258.8)	85.5		(97.4)	(739.8)
Interest expense, net	73.6	72.0		222.1	204.4
Other expense, net	0.5	17.5		4.0	25.0
Loss before income taxes	(332.9)	(4.0)		(323.5)	(969.2)
Operating Segments \| Americas
Segment Reporting Information [Line Items]
Net revenues	492.6	581.6		1,689.0	1,897.4
Operating (loss) income	(16.8)	36.4		20.0	(293.3)
Operating Segments \| EMEA
Segment Reporting Information [Line Items]
Net revenues	550.6	705.6		2,229.7	2,406.0
Operating (loss) income	(47.4)	53.8		108.8	(207.6)
Operating Segments \| Asia Pacific
Segment Reporting Information [Line Items]
Net revenues	124.7	197.7		537.5	606.5
Operating (loss) income	(24.7)	22.4		3.0	(29.4)
Operating Segments \| Professional Beauty
Segment Reporting Information [Line Items]
Net revenues	360.1	419.0		1,304.1	1,348.6
Operating (loss) income	2.1	33.0		112.4	110.8
Other
Segment Reporting Information [Line Items]
Net revenues	0.0	86.7		55.5	274.6
Operating (loss) income	0.0	(2.9)		(11.0)	(11.0)
Corporate
Segment Reporting Information [Line Items]
Operating (loss) income	$ (172.0)	$ (57.2)		$ (330.6)	$ (309.3)

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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