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]
Purchase of Class A Common Stock (in shares)	500,000																				500,000
Purchase of Class A Common Stock	$ (4.5)				(4.5)																$ (4.5)
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
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				$ 30.9				$ 30.9							$ 30.9
Net income (loss)	55.1				52.3											52.3							2.8
Other comprehensive income (loss)	(124.6)				(124.6)														(124.6)
Adjustments related to the sale of the Wella Business	6.2				6.2								6.2
Adjustment of redeemable noncontrolling interests to redemption value	(3.9)				(3.9)								(3.9)
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
Redeemable Noncontrolling Interests
Net income	1.2
Distribution to noncontrolling interests, net	(1.9)
Adjustments related to the sale of the Wella Business	(360.4)
Adjustment of redeemable noncontrolling interests to redemption value	3.9
Balance, end of period at Sep. 30, 2019	94.6
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]
Dividends settled in Shares of Class A Common Stock	0.0
Other comprehensive income (loss)	(18.6)
Balance, end of period (in shares) at Dec. 31, 2019									9,400,000		826,000,000.0										65,500,000
Balance, end of period at Dec. 31, 2019	4,481.6				4,471.7				$ 0.1		$ 8.3		10,497.8			(4,510.7)			(77.5)		$ (1,446.3)		9.9
Balance, beginning of period at Jun. 30, 2019	451.8		451.8
Balance, end of period at Dec. 31, 2019	98.6
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)
Balance, end 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, end of period at Jun. 30, 2020	$ 3,228.8	(5.7)	3,223.1		3,004.6	(5.7)	2,998.9				$ 8.3	$ 8.3	10,447.4	10,447.4		(5,548.6)	(5.7)	(5,554.3)	(456.2)	(456.2)	$ (1,446.3)	$ (1,446.3)	224.2	224.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balance, beginning of period at Jun. 30, 2019	$ 451.8		451.8
Balance, end of period at Jun. 30, 2020	79.1		79.1
Balance, end of period at Jun. 30, 2020	715.8		715.8
Balance, beginning of period (in shares) at Sep. 30, 2019									9,400,000		822,500,000										65,500,000
Balance, beginning 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock options and restricted stock units (in shares)											1,100,000
Exercise of employee stock options and restricted stock units	1.5				1.5								1.5
Shares withheld for employee taxes	(3.5)				(3.5)								(3.5)
Share-based compensation expense	10.3				10.3								10.3
Dividends declared - Cash and Other	(66.1)				(66.1)								(66.1)
Dividends	(29.3)				(29.3)								(29.3)
Dividends settled in Shares of Class A Common Stock (in shares)											2,400,000
Dividends settled in Shares of Class A Common Stock				29.5				29.5			$ 0.2				29.3
Net income (loss)	(20.6)				(21.1)											(21.1)							0.5
Other comprehensive income (loss)	106.0				105.9														105.9				0.1
Adjustment of redeemable noncontrolling interests to redemption value	(10.5)				(10.5)								(10.5)
Balance, end of period (in shares) at Dec. 31, 2019									9,400,000		826,000,000.0										65,500,000
Balance, end of period at Dec. 31, 2019	4,481.6				4,471.7				$ 0.1		$ 8.3		10,497.8			(4,510.7)			(77.5)		$ (1,446.3)		9.9
Balance, beginning of period at Sep. 30, 2019	94.6
Redeemable Noncontrolling Interests
Net income	4.2
Adjustment of redeemable noncontrolling interests to redemption value	10.5
Distribution to noncontrolling interests, net	(10.7)
Balance, end of period at Dec. 31, 2019	98.6
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	(5.7)	3,223.1		3,004.6	(5.7)	2,998.9				$ 8.3	$ 8.3	10,447.4	10,447.4		(5,548.6)	(5.7)	(5,554.3)	(456.2)	(456.2)	$ (1,446.3)	$ (1,446.3)	224.2	224.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock options and restricted stock units (in shares)											600,000
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 (loss)	221.8				221.4											221.4							0.4
Other comprehensive income (loss)	(6.0)				(5.9)														(5.9)				(0.1)
Adjustment of redeemable noncontrolling interests to redemption value	1.5				1.5								1.5
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						$ 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
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
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	$ (5.7)	3,223.1		3,004.6	$ (5.7)	$ 2,998.9				$ 8.3	$ 8.3	10,447.4	$ 10,447.4		(5,548.6)	$ (5.7)	$ (5,554.3)	(456.2)	$ (456.2)	$ (1,446.3)	$ (1,446.3)	224.2	$ 224.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of Class A Common Stock (in shares)	0
Changes in dividends accrued	$ 1.2
Dividends settled in Shares of Class A Common Stock	43.9
Other comprehensive income (loss)	129.8
Balance, end of period (in shares) at Dec. 31, 2020									1,500,000		831,600,000										65,500,000
Balance, end of period at Dec. 31, 2020	3,295.3				3,077.4						$ 8.3		10,427.1			(5,585.2)			(326.5)		$ (1,446.3)		217.9
Balance, beginning of period at Jun. 30, 2020	79.1		79.1
Balance, beginning of period at Jun. 30, 2020	715.8		$ 715.8
Balance, end of period at Dec. 31, 2020	79.5
Balance, end of period at Dec. 31, 2020	1,002.2
Balance, beginning of period (in shares) at Sep. 30, 2020									1,500,000		831,200,000										65,500,000
Balance, beginning of period at Sep. 30, 2020	$ 3,425.6				3,201.1						$ 8.3		10,434.1			(5,332.9)			(462.1)		$ (1,446.3)		224.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of Class A Common Stock (in shares)	0
Exercise of employee stock options and restricted stock units (in shares)											400,000
Shares withheld for employee taxes	$ (0.9)				(0.9)								(0.9)
Share-based compensation expense	14.4				14.4								14.4
Dividends accrued- Convertible Series B Preferred Stock	(23.2)				(23.2)								(23.2)
Dividends settled in Shares of Class A Common Stock				$ 0.4				$ 0.4							$ 0.4
Net income (loss)	(254.8)				(252.3)											(252.3)							(2.5)
Other comprehensive income (loss)	135.8				135.6														135.6				0.2
Distribution to noncontrolling interests, net	(4.3)																						(4.3)
Adjustment of redeemable noncontrolling interests to redemption value	1.8				1.8								1.8
Equity Investment contribution for share-based compensation	0.5				0.5								0.5
Balance, end of period (in shares) at Dec. 31, 2020									1,500,000		831,600,000										65,500,000
Balance, end of period at Dec. 31, 2020	3,295.3				$ 3,077.4						$ 8.3		$ 10,427.1			$ (5,585.2)			$ (326.5)		$ (1,446.3)		$ 217.9
Balance, beginning of period at Sep. 30, 2020	83.1
Balance, beginning of period at Sep. 30, 2020	979.0
Redeemable Noncontrolling Interests
Dividends accrued- Convertible Series B Preferred Stock	23.2
Net income	0.3
Distribution to noncontrolling interests, net	(2.1)
Adjustment of redeemable noncontrolling interests to redemption value	(1.8)
Balance, end of period at Dec. 31, 2020	79.5
Balance, end of period at Dec. 31, 2020	$ 1,002.2