NET INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Amounts attributable to Coty Inc.
Net income from continuing operations	$ 116.7	$ 12.8
Convertible Series B Preferred Stock dividends	(20.8)	0.0
Net income from continuing operations attributable to common stockholders	95.9	12.8
Net income from discontinued operations	104.7	39.5
Net income attributable to common stockholders	$ 200.6	$ 52.3
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	763.9	754.2
Effect of dilutive stock options and Series A/A-1 Preferred Stock (in shares)	0.0	1.1
Effect of restricted stock and RSUs (in shares)	1.4	3.6
Effect of Convertible Series B Preferred Stock (in shares)	151.4	0.0
Weighted-average common shares outstanding—Diluted (in shares)	916.7	758.9
Earnings per common share
Earnings from continued operations per common share - basic (in dollars per share)	$ 0.13	$ 0.02
Earnings from continued operations per common share - diluted (in dollars per share)	0.13	0.02
Earnings from discontinued operations - basic (in dollars per share)	0.13	0.05
Earnings from discontinued operations - diluted (in dollars per share)	0.11	0.05
Earnings per common share - basic (in dollars per share)	0.26	0.07
Earnings per common share - diluted (in dollars per share)	$ 0.24	$ 0.07
Stock options and Series A preferred stock
Earnings per common share
Anti-dilutive shares (in shares)	16.8	24.3
RSUs
Earnings per common share
Anti-dilutive shares (in shares)	10.9	0.6