NET (LOSS) INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net (loss) income attributable to Coty Inc.	$ (422.2)	$ 156.9	$ 232.5
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic	642.8	345.5	353.3
Effect of dilutive stock options and Series A Preferred Stock	0.0	5.7	7.6
Effect of restricted stock and RSUs	0.0	3.0	2.0
Weighted-average common shares outstanding—Diluted	642.8	354.2	362.9
Net (loss) income attributable to Coty Inc. per common share:
Basic (dollars per shares)	$ (0.66)	$ 0.45	$ 0.66
Diluted (dollars per shares)	$ (0.66)	$ 0.44	$ 0.64
Outstanding Stock Options and Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options excluded from diluted earnings per share calculation due to anti-dilutive effect		3.0	0.7
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options excluded from diluted earnings per share calculation due to anti-dilutive effect		0.1	0.4