NET INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income (loss) attributable to Coty Inc.	$ (164.2)	$ (26.8)	$ (117.4)	$ 187.9
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	747,300,000	337,900,000	607,900,000	347,800,000
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0	0	0	6,100,000
Effect of restricted stock and RSUs (in shares)	0	0	0	3,000,000
Weighted-average common shares outstanding—Diluted (in shares)	747,300,000	337,900,000	607,900,000	356,900,000
Net income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ (0.22)	$ (0.08)	$ (0.19)	$ 0.54
Diluted (in dollars per share)	$ (0.22)	$ (0.08)	$ (0.19)	$ 0.53
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)	0	0	0	3,200,000
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of diluted EPS (in shares)	0	0	0	100,000