NET INCOME (LOSS) ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Amounts attributable to Coty Inc.:
Net income (loss) from continuing operations	$ 253.8	$ (64.0)	$ (1,093.9)
Convertible Series B Preferred Stock dividends	198.3	102.3	6.5
Net income (loss) from continuing operations attributable to common stockholders	55.5	(166.3)	(1,100.4)
Net income (loss) from discontinued operations, net of tax	5.7	(137.3)	87.2
Net income (loss) from continuing operations attributable to common stockholders	$ 61.2	$ (303.6)	$ (1,013.2)
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	820.6	764.8	759.1
Effect of dilutive stock options and Series A/A-1 Preferred Stock (in shares)	0.0	0.0	0.0
Effect of restricted stock and RSUs (in shares)	13.5	0.0	0.0
Effect of Convertible Series B Preferred Shares (in shares)	0.0	0.0	0.0
Weighted-average common shares and common share equivalents outstanding—Diluted (in shares)	834.1	764.8	759.1
Earnings (losses) per common share
Loss from continuing operations per common share - basic (in dollars per share)	$ 0.07	$ (0.22)	$ (1.45)
Loss from continuing operations per common share - diluted (in dollars per share)	0.07	(0.22)	(1.45)
(Loss) earnings from discontinued operations - basic (in dollars per share)	0.01	(0.18)	0.12
(Loss) earnings from discontinued operations - diluted (in dollars per share)	0.01	(0.18)	0.12
Loss per common share - basic (in dollars per share)	0.08	(0.40)	(1.33)
Loss per common share - diluted (in dollars per share)	$ 0.08	$ (0.40)	$ (1.33)
Share-Based Payment Arrangement, Option And Series A Preferred Stock
Earnings (losses) per common share
Anti-dilutive shares (in shares)	8.3
Restricted Stock Units
Earnings (losses) per common share
Anti-dilutive shares (in shares)	1.6
Convertible Series B Preferred Stock
Earnings (losses) per common share
Anti-dilutive shares (in shares)	65.4