NET INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net (loss) income attributable to Coty Inc.	$ (19.7)	$ 0.0
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	748.6	336.3
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0.0	0.0
Effect of restricted stock and RSUs (in shares)	0.0	0.0
Weighted-average common shares outstanding—Diluted (in shares)	748.6	336.3
Net (loss) income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ (0.03)	$ 0.00
Diluted (in dollars per share)	$ (0.03)	$ 0.00