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, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Amounts attributable to Coty Inc.:
Net income from continuing operations	$ 108.4	$ 52.9	$ 475.3	$ 536.5
Convertible Series B Preferred Stock dividends	(3.3)	(3.3)	(9.9)	(195.0)
Net income from continuing operations attributable to common stockholders	105.1	49.6	465.4	341.5
Net income from discontinued operations, net of tax	0.0	0.7	0.0	4.5
Net income attributable to common stockholders	$ 105.1	$ 50.3	$ 465.4	$ 346.0
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	851.6	838.4	848.1	814.8
Effect of dilutive stock options and Series A Preferred Stock (in shares)	0.0	0.0	0.0	0.0
Effect of restricted stock and RSUs (in shares)	13.6	14.5	14.0	12.7
Effect of Convertible Series B Preferred Stock (in shares)	0.0	0.0	23.7	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)	865.2	852.9	885.8	827.5
Earnings per common share:
Earnings from continuing operations per common share - basic (in dollars per share)	$ 0.12	$ 0.06	$ 0.55	$ 0.42
Earnings from continuing operations per common share - diluted (in dollars per share)	0.12	0.06	0.54	0.42
Earnings per common share - basic (in dollars per share)	0.12	0.06	0.55	0.42
Earnings per common share - diluted (in dollars per share)	$ 0.12	$ 0.06	$ 0.54	$ 0.42
Convertible Series B Preferred Stock dividends	$ 3.3	$ 3.3	$ 9.9	$ 195.0
Antidilutive​ fair market value adjustments	$ (93.9)	$ 0.0	$ (100.7)	$ 0.0
Stock Options and Series A Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	5.6	6.6	5.8	8.9
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	0.0	0.7	0.0	2.3
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	23.7	23.7		79.2