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, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Amounts attributable to Coty Inc.:
Net income attributable to Coty Inc.	$ 23.7	$ 180.9	$ 106.6	$ 182.5
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)	(6.6)	(6.6)
Net income attributable to common stockholders	$ 20.4	$ 177.6	$ 100.0	$ 175.9
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	871.4	892.8	869.6	873.6
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0.0	0.0	0.0	0.1
Effect of restricted stock and RSUs (in shares)	3.8	6.3	5.6	9.6
Effect of Convertible Series B Preferred Stock (in shares)	0.0	23.7	0.0	0.0
Effect of Forward Repurchase Contracts (in shares)	0.0	0.0	0.0	0.0
Weighted-average common shares outstanding—Diluted (in shares)	875.2	922.8	875.2	883.3
Earnings per common share:
Earnings per common share - basic (in dollars per share)	$ 0.02	$ 0.20	$ 0.11	$ 0.20
Earnings per common share - diluted (in dollars per share)	$ 0.02	$ 0.20	$ 0.11	$ 0.20
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3	$ 6.6	$ 6.6
Antidilutive​ fair market value losses (gains)	$ 96.5	$ (44.4)	$ 128.8	$ (0.2)
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	3.5	3.9	3.5	2.9
Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)			0.0
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	13.7	3.9	6.8	2.0
Restricted stock outstanding (in shares)	0.0	0.0	0.0	0.0
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	0.0	23.7	0.0	0.0
Forward Contracts
Earnings per common share:
Anti-dilutive shares (in shares)	0.0	0.0	0.0	0.0