NET INCOME 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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Amounts attributable to Coty Inc.:
Net income attributable to Coty Inc.	$ 3.8	$ 108.4	$ 186.3	$ 475.3
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)	(9.9)	(9.9)
Net income attributable to common stockholders	$ 0.5	$ 105.1	$ 176.4	$ 465.4
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	883.1	851.6	876.7	848.1
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0.2	0.0	0.1	0.0
Effect of restricted stock and RSUs (in shares)	8.7	13.6	9.3	14.0
Effect of Convertible Series B Preferred Stock (in shares)	0.0	0.0	0.0	23.7
Effect of Forward Repurchase Contracts (in shares)	0.0	0.0	0.0	0.0
Weighted-average common shares outstanding—Diluted (in shares)	892.0	865.2	886.1	885.8
Earnings per common share:
Earnings per common share - basic (in dollars per share)	$ 0	$ 0.12	$ 0.20	$ 0.55
Earnings per common share - diluted (in dollars per share)	$ 0	$ 0.12	$ 0.20	$ 0.54
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3	$ 9.9	$ 9.9
Antidilutive​ fair market value losses (gains)	$ 7.1	$ (93.9)	$ 6.9	$ (100.7)
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	1.7	5.6	2.5	5.8
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	0.0	0.0	1.3	0.0
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	23.7	23.7	23.7