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SEGMENT REPORTING - Reporting Segments (Details) $ in Millions	12 Months Ended
	Jun. 30, 2018 unit	Jun. 30, 2018 USD ($)	Jun. 30, 2018 segment	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment			3
Number of reportable segments	3		3
Net revenues		$ 9,398.0		$ 7,650.3	$ 4,349.1
Depreciation and amortization		737.0		555.1	232.0
Operating income (loss)		161.2		(437.8)	254.2
Interest expense, net		265.0		218.6	81.9
Loss on early extinguishment of debt		10.7		0.0	3.1
Other expense, net		38.0		1.6	30.4
(Loss) income before income taxes		(152.5)		(658.0)	138.8
Luxury
Segment Reporting Information [Line Items]
Net revenues		3,210.5		2,566.6	1,836.6
Consumer Beauty
Segment Reporting Information [Line Items]
Net revenues		4,268.1		3,688.2	2,262.5
Professional Beauty
Segment Reporting Information [Line Items]
Net revenues		1,919.4		1,395.5	250.0
Operating Segments \| Luxury
Segment Reporting Information [Line Items]
Depreciation and amortization		253.3		203.5	99.1
Operating income (loss)		248.7		158.0	228.9
Operating Segments \| Consumer Beauty
Segment Reporting Information [Line Items]
Depreciation and amortization		340.4		256.2	114.6
Operating income (loss)		278.9		261.2	246.5
Operating Segments \| Professional Beauty
Segment Reporting Information [Line Items]
Depreciation and amortization		143.3		95.4	18.0
Operating income (loss)		119.4		78.5	68.0
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization		0.0		0.0	0.3
Operating income (loss)		$ (485.8)		$ (935.5)	$ (289.2)