CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Class A Common Stock	Total Coty Inc. Stockholders’ Equity	Total Coty Inc. Stockholders’ Equity Cumulative Effect, Period of Adoption, Adjustment	Total Coty Inc. Stockholders’ Equity Cumulative Effect, Period of Adoption, Adjusted Balance	Total Coty Inc. Stockholders’ Equity Class A Common Stock	Preferred Stock	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock Class A Common Stock	Common Stock Class A Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital Class A Common Stock	(Accumulated Deficit)	(Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	(Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling Interests	Noncontrolling Interests Cumulative Effect, Period of Adoption, Adjusted Balance
Balance, beginning of period (in shares) at Jun. 30, 2019									9,400,000	9,400,000	819,200,000	819,200,000									65,000,000.0	65,000,000.0
Balance, beginning of period at Jun. 30, 2019	$ 4,593.4		$ 4,592.7		$ 4,586.9		$ 4,586.2		$ 0.1	$ 0.1	$ 8.1	$ 8.1	$ 10,620.5	$ 10,620.5		$ (4,541.2)		$ (4,541.9)	$ (58.8)	$ (58.8)	$ (1,441.8)	$ (1,441.8)	$ 6.5	$ 6.5
Balance, beginning of period (Adjustment due to the adoption of ASU No. 2016-16) at Jun. 30, 2019		$ (0.7)				$ (0.7)											$ (0.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock options and restricted stock units (in shares)											100,000
Exercise of employee stock options and restricted stock units	0.6				0.6								0.6
Share-based compensation expense	6.2				6.2								6.2
Net income	55.1				52.3											52.3							2.8
Other comprehensive loss	(124.6)				(124.6)														(124.6)
Adjustment of redeemable noncontrolling interests to redemption value	$ (3.9)				(3.9)								(3.9)
Purchase of Class A Common Stock (in shares)	500,000																				500,000
Purchase of Class A Common Stock	$ (4.5)				(4.5)																$ (4.5)
Dividends declared - Cash and Other	(63.5)				(63.5)								(63.5)
Dividends declared - stock	(30.9)				(30.9)								(30.9)
Dividends settled in Shares of Class A Common Stock (in shares)											3,200,000
Dividends settled in Shares of Class A Common Stock	0.0			$ 30.9				$ 30.9							$ 30.9
Distribution to noncontrolling interests, net	0.0
Adjustments related to the sale of business	6.2				6.2								6.2
Balance, end of period (in shares) at Sep. 30, 2019									9,400,000		822,500,000										65,500,000
Balance, end of period at Sep. 30, 2019	4,464.3				4,455.0				$ 0.1		$ 8.1		10,566.1			(4,489.6)			(183.4)		$ (1,446.3)		9.3
Balance, beginning of period at Jun. 30, 2019	451.8		451.8
Balance, beginning of period at Jun. 30, 2019	0.0		0.0
Redeemable Noncontrolling Interests
Net income	1.2
Adjustment of redeemable noncontrolling interests to redemption value	3.9
Distribution to noncontrolling interests, net	(1.9)
Adjustments related to the sale of business	(360.4)
Balance, end of period at Sep. 30, 2019	94.6
Balance, end of period at Sep. 30, 2019	0.0
Balance, beginning of period (in shares) at Jun. 30, 2020									1,500,000	1,500,000	830,600,000	830,600,000									65,500,000	65,500,000
Balance, beginning of period at Jun. 30, 2020	3,228.8		3,223.1		3,004.6		$ 2,998.9		$ 0.0	$ 0.0	$ 8.3	$ 8.3	10,447.4	$ 10,447.4		(5,548.6)		$ (5,554.3)	(456.2)	$ (456.2)	$ (1,446.3)	$ (1,446.3)	224.2	$ 224.2
Balance, beginning of period (Adjustment due to the adoption of ASU No. 2016-13) at Jun. 30, 2020		$ (5.7)				$ (5.7)											$ (5.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock options and restricted stock units (in shares)											600,000
Exercise of employee stock options and restricted stock units	0.0
Shares withheld for employee taxes	(1.0)				(1.0)								(1.0)
Share-based compensation expense	6.2				6.2								6.2
Changes in dividends accrued	0.8				0.8								0.8
Dividends accrued- Convertible Series B Preferred Stock	(20.8)				(20.8)								(20.8)
Net income	221.8				221.4											221.4							0.4
Other comprehensive loss	(6.0)				(5.9)														(5.9)				(0.1)
Adjustment of redeemable noncontrolling interests to redemption value	$ 1.5				1.5								1.5
Purchase of Class A Common Stock (in shares)	0
Dividends settled in Shares of Class A Common Stock	$ 20.8
Balance, end of period (in shares) at Sep. 30, 2020									1,500,000		831,200,000										65,500,000
Balance, end of period at Sep. 30, 2020	3,425.6				$ 3,201.1				$ 0.0		$ 8.3		$ 10,434.1			$ (5,332.9)			$ (462.1)		$ (1,446.3)		$ 224.5
Balance, beginning of period at Jun. 30, 2020	79.1		79.1
Balance, beginning of period at Jun. 30, 2020	715.8		$ 715.8
Redeemable Noncontrolling Interests
Issuance of Preferred Stock	242.4
Dividends accrued- Convertible Series B Preferred Stock	20.8
Net income	5.5
Adjustment of redeemable noncontrolling interests to redemption value	(1.5)
Balance, end of period at Sep. 30, 2020	83.1
Balance, end of period at Sep. 30, 2020	$ 979.0