NET INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Amounts attributable to Coty Inc.:
Net income attributable to Coty Inc.	$ 1.6	$ 128.6
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)
Net (loss) income attributable to common stockholders	$ (1.7)	$ 125.3
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	854.3	842.0
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	16.5
Effect of Convertible Series B Preferred Stock (in shares)	0.0	23.7
Effect of Forward Repurchase Contracts (in shares)	0.0	0.0
Weighted-average common shares outstanding—Diluted (in shares)	854.3	882.2
Earnings per common share:
Earnings per common share - basic (in dollars per share)	$ 0	$ 0.15
Earnings per common share - diluted (in dollars per share)	$ 0	$ 0.15
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3
Antidilutive​ fair market value adjustments	$ 44.3	$ 27.7
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)		6.2
Forward Repurchase Contract
Earnings per common share:
Anti-dilutive shares (in shares)		3.1