NET LOSS ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net loss attributable to Coty Inc.	$ (271.6)	$ (12.1)	$ (240.4)	$ (984.8)
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	760.8	751.4	757.7	751.1
Effect of dilutive stock options and Series A/A-1 Preferred Stock (in shares)	0.0	0.0	0.0	0.0
Effect of restricted stock and RSUs (in shares)	0.0	0.0	0.0	0.0
Weighted-average common shares outstanding—Diluted (in shares)	760.8	751.4	757.7	751.1
Net loss attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ (0.36)	$ (0.02)	$ (0.32)	$ (1.31)
Diluted (in dollars per share)	$ (0.36)	$ (0.02)	$ (0.32)	$ (1.31)