CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions	Total	Class A Common Stock	Total Coty Inc. Stockholders’ Equity	Preferred Stock	Common Stock Class A Common Stock	Additional Paid-in Capital	(Accumulated Deficit)	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Noncontrolling Interests
Beginning balance (in shares) at Jun. 30, 2024				1.0
Balance, beginning of period at Jun. 30, 2024	$ 4,011.7		$ 3,827.1	$ 0.0	$ 9.6	$ 11,308.0	$ (4,898.5)	$ (795.1)	$ (1,796.9)	$ 184.6
Beginning balance (in shares) at Jun. 30, 2024					962.1
Beginning balance (in shares) at Jun. 30, 2024									94.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	16.9		16.9			16.9
Equity Investment contribution for share-based compensation	0.4		0.4			0.4
Dividends Accrued - Convertible Series B Preferred Stock	(3.3)		(3.3)			(3.3)
Net (loss) income	85.0		82.9				82.9			2.1
Other comprehensive income	120.6		120.6					120.6
Adjustment of redeemable noncontrolling interests to redemption value	0.6		0.6			0.6
Ending balance at Sep. 30, 2024	4,231.9		4,045.2	$ 0.0	$ 9.6	11,322.6	(4,815.6)	(674.5)	$ (1,796.9)	186.7
Ending balance (in shares) at Sep. 30, 2024				1.0
Ending balance (in shares) at Sep. 30, 2024					962.1
Ending balance (in shares) at Sep. 30, 2024									94.3
Beginning balance, redeemable noncontrolling interest at Jun. 30, 2024	93.6
Beginning balance, convertible stock at Jun. 30, 2024	142.4
Redeemable Noncontrolling Interests
Dividends Accrued - Convertible Series B Preferred Stock	3.3
Dividends Paid - Convertible Series B Preferred Stock	(3.3)
Net (loss) income	5.7
Other comprehensive income	0.1
Adjustment of redeemable noncontrolling interests to redemption value	(0.6)
Ending balance, redeemable noncontrolling interest at Sep. 30, 2024	98.8
Ending balance, convertible stock at Sep. 30, 2024	$ 142.4
Beginning balance (in shares) at Jun. 30, 2025	1.0			1.0
Balance, beginning of period at Jun. 30, 2025	$ 3,719.0		3,542.7	$ 0.0	$ 9.6	11,329.8	(5,266.4)	(733.4)	$ (1,796.9)	176.3
Beginning balance (in shares) at Jun. 30, 2025	872.3				966.5
Beginning balance (in shares) at Jun. 30, 2025	94.3								94.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock options and restricted stock units (in shares)					1.6
Share-based compensation expense	$ 14.4		14.4			14.4
Dividends Accrued - Convertible Series B Preferred Stock	(3.3)		(3.3)			(3.3)
Net (loss) income	70.0		67.9				67.9			2.1
Other comprehensive income	14.7		14.8					14.8		(0.1)
Adjustment of redeemable noncontrolling interests to redemption value	6.9		6.9			6.9
Ending balance at Sep. 30, 2025	$ 3,821.7		$ 3,643.4	$ 0.0	$ 9.6	$ 11,347.8	$ (5,198.5)	$ (718.6)	$ (1,796.9)	$ 178.3
Ending balance (in shares) at Sep. 30, 2025	1.0			1.0
Ending balance (in shares) at Sep. 30, 2025	873.9	873.9			968.1
Ending balance (in shares) at Sep. 30, 2025	94.3								94.3
Beginning balance, redeemable noncontrolling interest at Jun. 30, 2025	$ 94.2
Beginning balance, convertible stock at Jun. 30, 2025	142.4
Redeemable Noncontrolling Interests
Dividends Accrued - Convertible Series B Preferred Stock	3.3
Dividends Paid - Convertible Series B Preferred Stock	(3.3)
Net (loss) income	4.0
Other comprehensive income	0.1
Adjustment of redeemable noncontrolling interests to redemption value	(6.9)
Ending balance, redeemable noncontrolling interest at Sep. 30, 2025	91.4
Ending balance, convertible stock at Sep. 30, 2025	$ 142.4