BUSINESS COMBINATIONS - P&G Beauty Business Acquisition (Details) - USD ($) shares in Millions		6 Months Ended
	Oct. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Total equity consideration transferred		$ 0	$ 9,628,600,000
Amount of assumed debt		0	$ 1,941,800,000
Goodwill		8,864,900,000			$ 8,555,500,000
Luxury
Business Acquisition [Line Items]
Goodwill		3,076,900,000			3,093,100,000
Consumer Beauty
Business Acquisition [Line Items]
Goodwill		4,817,400,000			4,494,900,000
Professional Beauty
Business Acquisition [Line Items]
Goodwill		$ 970,600,000			967,500,000
Galleria
Business Acquisition [Line Items]
Total consideration to acquire business	$ 11,570,400,000
Total equity consideration transferred	9,628,600,000
Amount of assumed debt	$ 1,941,800,000
Number of shares received by former holders of Galleria common stock (in shares)	409.7
Goodwill				$ 5,563,900,000	$ 5,528,400,000
Galleria | Luxury
Business Acquisition [Line Items]
Goodwill expected to be tax deductible	$ 0
Goodwill	1,889,800,000
Galleria | Consumer Beauty
Business Acquisition [Line Items]
Goodwill	3,188,100,000
Galleria | Professional Beauty
Business Acquisition [Line Items]
Goodwill	$ 486,000,000