NET INCOME (LOSS) ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Amounts attributable to Coty Inc.
Net income from continuing operations	$ 257.6	$ (16.7)	$ 483.6	$ 100.0
Convertible Series B Preferred Stock dividends	(68.7)	(23.1)	(191.7)	(43.9)
Net income from continuing operations attributable to common stockholders	188.9	(39.8)	291.9	56.1
Net income from discontinued operations, net of tax	3.8	(235.6)	3.8	(130.9)
Net income attributable to common stockholders	$ 192.7	$ (275.4)	$ 295.7	$ (74.8)
Weighted-average common shares outstanding:
Weighted-average common shares outstanding—Basic (in shares)	829,100,000	764,600,000	803,300,000	764,300,000
Effect of dilutive stock options and Series A/A-1 Preferred Stock (in shares)	0	0	0	0
Effect of restricted stock and RSUs (in shares)	13,600,000	0	11,800,000	4,200,000
Effect of Convertible Series B Preferred Stock (in shares)	0	0	0	158,100,000
Weighted-average common shares outstanding—Diluted (in shares)	842,700,000	764,600,000	815,100,000	926,600,000
Earnings per common share:
Earnings from continuing operations per common share - basic (in dollars per share)	$ 0.23	$ (0.05)	$ 0.36	$ 0.07
Earnings from continuing operations per common share - diluted (in dollars per share)	0.23	(0.05)	0.36	0.07
Earnings from discontinued operations - basic (in dollars per share)	0	(0.31)	0	(0.17)
Earnings from discontinued operations - diluted (in dollars per share)	0	(0.31)	0	(0.17)
Earnings per common share - basic (in dollars per share)	0.23	(0.36)	0.36	(0.10)
Earnings per common share - diluted (in dollars per share)	$ 0.23	$ (0.36)	$ 0.36	$ (0.10)
Stock options and Series A preferred stock
Earnings per common share:
Anti-dilutive shares (in shares)	8,800,000		10,100,000	16,000,000
RSUs
Earnings per common share:
Anti-dilutive shares (in shares)	0		2,500,000	8,500,000
Series B Preferred Stock
Earnings per common share:
Anti-dilutive shares (in shares)	49,600,000		106,400,000	0