NET INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Amounts attributable to Coty Inc.:
Net income attributable to Coty Inc.	$ 82.9	$ 1.6
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)
Net income (loss) attributable to common stockholders	$ 79.6	$ (1.7)
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	867,900	854,300
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0	0
Effect of restricted stock and RSUs (in shares)	7,400	0
Effect of Convertible Series B Preferred Stock (in shares)	0	0
Effect of Forward Repurchase Contracts (in shares)	0	0
Weighted-average common shares outstanding—Diluted (in shares)	875,300	854,300
Earnings per common share:
Earnings per common share - basic (in dollars per share)	$ 0.09	$ 0
Earnings per common share - diluted (in dollars per share)	$ 0.09	$ 0
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3
Antidilutive​ fair market value losses (gains)	$ 24.6	$ 44.3
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	3,500
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	0	0
Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	0
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	0	0
Forward Contracts
Earnings per common share:
Anti-dilutive shares (in shares)	0	0