NET INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to Coty Inc.	$ 46.8	$ 89.0	$ 46.8	$ 214.7
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	746.6	345.0	539.8	352.5
Effect of dilutive stock options and Series A Preferred Stock (in shares)	2.7	6.3	3.2	6.5
Effect of restricted stock and RSUs (in shares)	3.1	3.0	2.8	3.0
Weighted-average common shares outstanding—Diluted (in shares)	752.4	354.3	545.8	362.0
Net income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ 0.06	$ 0.26	$ 0.09	$ 0.61
Diluted (in dollars per share)	$ 0.06	$ 0.25	$ 0.09	$ 0.59
Outstanding Stock Options and Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of diluted EPS (in shares)	10.8	3.0	6.4	3.3
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of diluted EPS (in shares)	1.1	0.1	0.6	0.1