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, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Amounts attributable to Coty Inc.:
Net income attributable to Coty Inc.	$ 180.9	$ 238.3	$ 182.5	$ 366.9
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)	(6.6)	(6.6)
Net income attributable to common stockholders	$ 177.6	$ 235.0	$ 175.9	$ 360.3
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	892.8	850.8	873.6	846.4
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0.0	0.0	0.1	0.0
Effect of restricted stock and RSUs (in shares)	6.3	12.3	9.6	14.4
Effect of Convertible Series B Preferred Stock (in shares)	23.7	23.7	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)	922.8	886.8	883.3	884.5
Earnings per common share:
Earnings per common share - basic (in dollars per share)	$ 0.20	$ 0.28	$ 0.20	$ 0.43
Earnings per common share - diluted (in dollars per share)	$ 0.20	$ 0.27	$ 0.20	$ 0.42
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3	$ 6.6	$ 6.6
Antidilutive​ fair market value adjustments	$ 44.4	$ 44.3	$ 0.2	$ 6.8
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	3.9	5.8	2.9	6.0
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	3.9	0.0	2.0	0.0
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)			23.7