CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS - USD ($) shares in Millions, $ in Millions	Total	Common Class A	Series A Preferred Stock	Total Coty Inc. Stockholders’ Equity	Total Coty Inc. Stockholders’ Equity Series A Preferred Stock	Preferred Stock	Common Stock Common Class A	Common Stock Common Class B	Additional Paid-in Capital	Additional Paid-in Capital Series A Preferred Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
BALANCE at Jun. 30, 2015	$ 984.7			$ 969.8		$ 0.0	$ 1.3	$ 2.6	$ 2,044.4		$ (193.9)	$ (274.0)	$ (610.6)	$ 14.9
BALANCE (shares) at Jun. 30, 2015						1.9	134.0	262.0					35.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of Class A Common Stock	(794.9)	$ (767.0)		(794.9)									$ (794.9)
Purchase of Class A Common Stock (shares)		27.4											28.4
Exercise of employee stock options	44.8			44.8			$ 0.1		44.7
Exercise of employee stock options (shares)							4.7
Cancellation of Preferred Stock	(0.1)			(0.1)					(0.1)
Cancellation of Preferred Stock (shares)						(0.2)
Reclassification of Class A Common Stock from liability to APIC	13.8			13.8					13.8
Share-based compensation expense	20.6		$ 1.6	20.6	$ 1.6				20.6	$ 1.6
Dividends	(89.8)			(89.8)					(89.8)
Net income (loss)	164.5			156.9							156.9			7.6
Other comprehensive income (loss)	34.4			34.3								34.3		0.1
Proceeds from redeemable noncontrolling interests	15.7													15.7
Exercise of employee stock options and restricted stock units and related tax benefits	3.2			3.2					3.2
BALANCE at Jun. 30, 2016	367.1			360.2		$ 0.0	$ 1.4	$ 2.6	2,038.4		(37.0)	(239.7)	$ (1,405.5)	6.9
BALANCE (shares) at Jun. 30, 2016						1.7	138.7	262.0					63.6
BALANCE at Jun. 30, 2015	86.3
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Reclassification of common stock/stock options to liability	14.7
Reclassification of Class A Common Stock from liability to APIC	0.4
Proceeds from redeemable noncontrolling interests	(14.8)
Adjustment of redeemable noncontrolling interests to redemption value	(10.1)
Adjustment of redeemable noncontrolling interests to redemption value	(3.2)
BALANCE at Jun. 30, 2016	73.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A Common Stock for acquisition	9,628.6			9,628.6			$ 4.1		9,624.5
Issuance of Class A Common Stock for Acquisition (shares)							(409.7)
Issuance of Preferred Stock (shares)						2.5
Stock Issued During Period, Shares, Conversion of Convertible Securities							262.0	(262.0)
Conversion of Common Stock							$ 2.6	$ (2.6)
Purchase of Class A Common Stock	(36.3)	$ (36.3)		(36.3)									$ (36.3)
Purchase of Class A Common Stock (shares)		1.4											1.4
Exercise of employee stock options and settlement of restricted stock units (shares)							2.5
Dividends ($0.500 per Common Share)	22.8			22.8					22.8
Share-based compensation expense	20.0			20.0					20.0
Dividends	(375.0)			(375.0)					(375.0)
Net income (loss)	(406.8)			(422.2)							(422.2)			15.4
Other comprehensive income (loss)	244.0			244.1								244.1		(0.1)
Proceeds from redeemable noncontrolling interests	10.0													10.0
Reclassification of noncontrolling interest to mandatory redeemable financial interest	(49.9)			(40.7)					(40.7)					(9.2)
Exercise of employee stock options and restricted stock units and related tax benefits	(86.8)			(86.8)					(86.8)
BALANCE at Jun. 30, 2017	9,317.7			9,314.7		$ 0.0	$ 8.1	$ 0.0	11,203.2		(459.2)	4.4	$ (1,441.8)	3.0
BALANCE (shares) at Jun. 30, 2017						4.2	812.9	0.0					65.0
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Reclassification of common stock/stock options to liability	8.3
Reclassification of Class A Common Stock from liability to APIC	0.0
Proceeds from redeemable noncontrolling interests	(32.3)
Redeemable noncontrolling interest due to business combination	415.9
Adjustment of redeemable noncontrolling interests to redemption value	86.8
Adjustment to repurchase of redeemable noncontrolling interests	(0.9)
BALANCE at Jun. 30, 2017	551.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE as adjusted—July 1, 2017	9,326.0			9,323.0		$ 0.0	$ 8.1		11,203.2		(450.9)	4.4	$ (1,441.8)	3.0
Cumulative effect of new accounting principle in period of adoption	8.3			8.3							8.3
Issuance of Class A Common Stock for acquisition	0.0			0.0
Cancellation of Preferred Stock (in shares)						(0.2)
Stock Issued During Period, Value, New Issues						$ 0.0
Issuance of Preferred Stock (shares)						1.0
Purchase of Class A Common Stock	(3.6)	$ 0.0
Purchase of Class A Common Stock (shares)		0.0
Exercise of employee stock options	$ 22.6			22.6					22.6
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net				(3.6)					(3.6)
Exercise of employee stock options (shares)	2.3						2.9
Cancellation of Preferred Stock	$ 0.0			0.0
Share-based compensation expense	31.5			31.5					31.5
Dividends ($0.500 per Common Share)	(377.6)			(377.6)					(377.6)
Share-based compensation expense	(166.8)
Net income (loss)				(168.8)							(168.8)			2.0
Other comprehensive income (loss)	148.4			147.9								147.9		0.5
Temporary equity, stock issued during period, value, new issues	7.4
Proceeds from redeemable noncontrolling interests	(54.3)
Exercise of employee stock options and restricted stock units and related tax benefits	(134.9)			(134.9)					(134.9)
BALANCE at Jun. 30, 2018	8,855.2			8,849.7		$ 0.0	$ 8.1		10,750.8		(626.2)	158.8	$ (1,441.8)	$ 5.5
BALANCE (shares) at Jun. 30, 2018						5.0	815.8						65.0
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Reclassification of common stock/stock options to liability	39.0
Reclassification of Class A Common Stock from liability to APIC	(17.0)
Proceeds from redeemable noncontrolling interests	0.2
Adjustment of redeemable noncontrolling interests to redemption value	134.9
Adjustment of redeemable noncontrolling interests to redemption value	(7.4)			(7.4)					(7.4)
BALANCE at Jun. 30, 2018	661.3
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Reclassifications of Temporary to Permanent Equity	$ 17.0			$ 17.0					$ 17.0
Cumulative effect of new accounting principle in period of adoption											$ (6.5)	$ 6.5