GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Changes in Goodwill (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019	Jun. 30, 2018
Goodwill [Roll Forward]
Gross balance		$ 9,092,100,000	$ 9,247,900,000
Accumulated impairments		(1,473,300,000)	(640,800,000)
Net balance at beginning of the period		8,607,100,000
Changes during the period ended March 31, 2019:
Goodwill measurement period adjustments		(9,400,000)
Foreign currency translation		(146,400,000)
Impairment charges	$ (832,500,000)	(832,500,000)	0
Gross balance		9,092,100,000	9,247,900,000
Accumulated impairments		(1,473,300,000)	(640,800,000)
Net balance at end of the period		7,618,800,000	8,607,100,000
Luxury
Goodwill [Roll Forward]
Gross balance		3,305,600,000	3,366,600,000
Accumulated impairments		(403,700,000)	(403,700,000)
Net balance at beginning of the period		2,962,900,000
Changes during the period ended March 31, 2019:
Goodwill measurement period adjustments		(10,500,000)
Foreign currency translation		(50,500,000)
Impairment charges		0
Gross balance		3,305,600,000	3,366,600,000
Accumulated impairments		(403,700,000)	(403,700,000)
Net balance at end of the period		2,901,900,000	2,962,900,000
Consumer Beauty
Goodwill [Roll Forward]
Gross balance		4,841,800,000	4,927,500,000
Accumulated impairments		(1,069,600,000)	(237,100,000)
Net balance at beginning of the period		4,690,400,000
Changes during the period ended March 31, 2019:
Goodwill measurement period adjustments		600,000
Foreign currency translation		(86,300,000)
Impairment charges		(832,500,000)
Gross balance		4,841,800,000	4,927,500,000
Accumulated impairments		(1,069,600,000)	(237,100,000)
Net balance at end of the period		3,772,200,000	4,690,400,000
Professional Beauty
Goodwill [Roll Forward]
Gross balance		944,700,000	953,800,000
Accumulated impairments		0	0
Net balance at beginning of the period		953,800,000
Changes during the period ended March 31, 2019:
Goodwill measurement period adjustments		500,000
Foreign currency translation		(9,600,000)
Impairment charges		0
Gross balance		944,700,000	953,800,000
Accumulated impairments		0	0
Net balance at end of the period		$ 944,700,000	$ 953,800,000