CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	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	Preferred Stock	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated Deficit Revision of Prior Period, Accounting Standards Update, Adjustment [Member]	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Revision of Prior Period, Accounting Standards Update, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling Interest	Noncontrolling Interest Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance (shares) at Jun. 30, 2017							4.2	4.2	812.9	812.9										65.0	65.0
Beginning balance at Jun. 30, 2017	$ 9,317.7		$ 9,326.0	$ 9,314.7		$ 9,323.0	$ 0.0	$ 0.0	$ 8.1	$ 8.1	$ 11,203.2	$ 11,203.2	$ (459.2)			$ (450.9)	$ 4.4		$ 4.4	$ (1,441.8)	$ (1,441.8)	$ 3.0	$ 3.0
Beginning balance (Accounting Standards Update 2016-09) at Jun. 30, 2017		$ 8.3			$ 8.3										$ 8.3
Beginning balance (Accounting Standards Update 2018-02) at Jun. 30, 2017														$ (6.5)				$ 6.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Revised Adjustment due to the adoption of ASU No. 2016-16		(112.6)			(112.6)										(112.6)
Issuance of Preferred Stock (shares)							1.0
Cancellation of Preferred Stock (shares)							(0.2)
Exercise of employee stock options and restricted stock units and related tax benefits (in shares)									2.9
Exercise of employee stock options and restricted stock units and related tax benefits	22.6			22.6							22.6
Shares withheld for employee taxes	(3.6)			(3.6)							(3.6)
Share-based compensation expense	31.5			31.5							31.5
Dividends	(377.6)			(377.6)							(377.6)
Net income (loss)	(166.8)			(168.8)									(168.8)									2.0
Other comprehensive income	148.4			147.9													147.9					0.5
Dilution of redeemable noncontrolling interest due to additional contribution	17.0			17.0							17.0
Additional redeemable noncontrolling interests due to employee grants	(7.4)			(7.4)							(7.4)
Adjustment of redeemable noncontrolling interests to redemption value	(134.9)			(134.9)							(134.9)
Ending balance (shares) at Jun. 30, 2018							5.0	5.0	815.8	815.8										65.0	65.0
Ending balance at Jun. 30, 2018	8,855.2	(18.2)	8,724.4	8,849.7	(18.2)	8,718.9	$ 0.0	$ 0.0	$ 8.1	$ 8.1	10,750.8	10,750.8	(626.2)		(18.2)	(757.0)	158.8		158.8	$ (1,441.8)	$ (1,441.8)	5.5	5.5
Beginning balance at Jun. 30, 2017	551.1		551.1
Beginning balance at Jun. 30, 2017	0.0		0.0
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	39.0
Distribution to noncontrolling interests, net	(54.3)
Dilution of redeemable noncontrolling interest due to additional contribution	(17.0)
Additional redeemable noncontrolling interests due to employee grants and other adjustments and issuance of stock	7.4
Proceeds from redeemable noncontrolling interests	0.2
Adjustment of redeemable noncontrolling interests to redemption value	134.9
Ending balance at Jun. 30, 2018	661.3		661.3
Ending balance at Jun. 30, 2018	0.0		0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Preferred Stock (shares)							7.9
Issuance of Preferred Stock	0.8			0.8			$ 0.1				0.7
Cancellation of Preferred Stock (shares)							(3.5)
Exercise of employee stock options and restricted stock units and related tax benefits (in shares)									1.0
Exercise of employee stock options and restricted stock units and related tax benefits	5.2			5.2							5.2
Shares withheld for employee taxes	(1.4)			(1.4)							(1.4)
Share-based compensation expense	16.9			16.9							16.9
Dividends declared - Cash and Other ($0.500 per common share)	(347.5)			(347.5)							(347.5)
Dividends declared - Stock	(30.6)			(30.6)							(30.6)
Dividends settled in Shares of Class A Common Stock (in shares)									2.4
Dividends settled in Shares of Class A Common Stock	30.6			30.6							30.6
Net income (loss)	(3,781.7)			(3,784.2)									(3,784.2)									2.5
Other comprehensive income	(217.5)			(217.6)													(217.6)					0.1
Distribution to noncontrolling interests, net	(1.6)																					(1.6)
Additional redeemable noncontrolling interests due to employee grants and other adjustments	(0.6)			(0.6)							(0.6)
Adjustment of redeemable noncontrolling interests to redemption value	196.4			196.4							196.4
Ending balance (shares) at Jun. 30, 2019							9.4	9.4	819.2	819.2										65.0	65.0
Ending balance at Jun. 30, 2019	$ 4,593.4	$ (0.7)	4,592.7	4,586.9	$ (0.7)	$ 4,586.2	$ 0.1	$ 0.1	$ 8.1	$ 8.1	10,620.5	$ 10,620.5	(4,541.2)		$ (0.7)	$ (4,541.9)	(58.8)		$ (58.8)	$ (1,441.8)	$ (1,441.8)	6.5	$ 6.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	$ 12.1
Distribution to noncontrolling interests, net	(26.8)
Additional redeemable noncontrolling interests due to employee grants and other adjustments and issuance of stock	1.6
Adjustment of redeemable noncontrolling interests to redemption value	(196.4)
Ending balance at Jun. 30, 2019	451.8		451.8
Ending balance at Jun. 30, 2019	0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cancellation of Preferred Stock (shares)							(7.9)
Cancellation of Preferred Stock	(0.7)			(0.7)			$ (0.1)				(0.6)
Purchase of Class A Common Stock (shares)																				0.5
Purchase of Class A Common Stock	(4.5)			(4.5)																$ (4.5)
Issuance of Restricted Stock (in shares)									2.0
Exercise of employee stock options and restricted stock units and related tax benefits (in shares)									1.4
Exercise of employee stock options and restricted stock units and related tax benefits	2.7			2.7							2.7
Shares withheld for employee taxes	(5.3)			(5.3)							(5.3)
Share-based compensation expense	31.8			31.8							31.8
Dividends declared - Cash and Other ($0.500 per common share)	(196.3)			(196.3)							(196.3)
Dividends declared - Stock	(88.9)			(88.9)							(88.9)
Dividends settled in Shares of Class A Common Stock (in shares)									8.0
Dividends settled in Shares of Class A Common Stock	89.1			89.1					$ 0.2		88.9
Dividends accrued - Convertible Series B Preferred Stock	(6.5)			(6.5)							(6.5)
Net income (loss)	(1,002.0)			(1,006.7)									(1,006.7)									4.7
Other comprehensive income	(397.3)																(397.4)
Distribution to noncontrolling interests, net	(397.3)			(397.4)																		0.1
Adjustments related to the sale of business	6.2			6.2							6.2
Noncontrolling interest due to transaction (See Note 4)	212.9																					212.9
Adjustment of redeemable noncontrolling interests to redemption value	(5.1)			(5.1)							(5.1)
Ending balance (shares) at Jun. 30, 2020							1.5		830.6											65.5
Ending balance at Jun. 30, 2020	$ 3,228.8			$ 3,004.6			$ 0.0		$ 8.3		$ 10,447.4		$ (5,548.6)				$ (456.2)			$ (1,446.3)		$ 224.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	$ (0.7)
Dividends accrued - Convertible Series B Preferred Stock	6.5
Distribution to noncontrolling interests, net	(16.7)
Additional redeemable noncontrolling interests due to employee grants and other adjustments and issuance of stock	709.3
Adjustments related to the sale of business	(360.4)
Adjustment of redeemable noncontrolling interests to redemption value	5.1
Ending balance at Jun. 30, 2020	79.1
Ending balance at Jun. 30, 2020	$ 715.8