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NET (LOSS) INCOME ATTRIBUTABLE TO COTY INC. PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Amounts attributable to Coty Inc.:      
Net (loss) income $ (604.8) $ (367.9) $ 89.4
Convertible Series B Preferred Stock dividends (13.2) (13.2) (13.2)
Net (loss) income attributable to common stockholders $ (618.0) $ (381.1) $ 76.2
Weighted-average common shares outstanding:      
Weighted-average common shares outstanding—Basic (in shares) 877.4 870.9 874.4
Effect of dilutive stock options and Series A Preferred Stock (in shares) 0.0 0.0 0.1
Effect of restricted stock, PRSUs and RSUs (in shares) 0.0 0.0 8.9
Effect of Convertible Series B Preferred Stock (in shares) 0.0 0.0 0.0
Effect of forward repurchase contracts 0.0 0.0 0.0
Weighted-average common shares and common share equivalents outstanding—Diluted (in shares) 877.4 870.9 883.4
Earnings (losses) per common share      
(Losses) earnings per common share - basic (in dollars per share) $ (0.70) $ (0.44) $ 0.09
(Losses) earnings per common share - diluted (in dollars per share) $ (0.70) $ (0.44) $ 0.09
Convertible Series B Preferred Stock dividends $ 13.2 $ 13.2 $ 13.2
Antidilutive​ fair market value adjustments $ 115.8 $ 248.1 $ 73.4
Share-Based Payment Arrangement, Option and Series A Preferred Stock      
Earnings (losses) per common share      
Anti-dilutive shares (in shares) 3.2 3.5 2.8
Restricted Stock Units      
Earnings (losses) per common share      
Anti-dilutive shares (in shares) 15.4 11.6 1.0
Convertible Series B Preferred Stock      
Earnings (losses) per common share      
Anti-dilutive shares (in shares) 0.0 0.0 0.0