CONDENSED CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS - USD ($) shares in Millions, $ in Millions	Total	Total Coty Inc. Stockholders’ Equity	Preferred Stock	Common Stock Common Class A	Common Stock Common Class B	Additional Paid-in Capital	Accumulated Deficit	Total	Treasury Stock	Noncontrolling Interest
BALANCE (in shares) at Jun. 30, 2015			1.9	134.0	262.0				(35.2)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of Class A Common Stock (in shares)									5.5
Purchase of Class A Common Stock	(155.7)	(155.7)							$ (155.7)
Reclassification of Class A Common Stock from liability to APIC	13.8	13.8				13.8
Exercise of employee stock options and restricted stock units and related tax benefits (in shares)				1.1
Exercise of employee stock options and restricted stock units and related tax benefits	9.9	9.9		$ 0.1		9.8
Share-based compensation expense	9.4	9.4				9.4
Dividends	(89.9)	(89.9)				(89.9)
Net income	130.1	125.7					125.7			4.4
Other comprehensive income (loss)	(12.6)	(12.1)						(12.1)		(0.5)
Distribution to noncontrolling interests, net	0.0									0.0
Adjustment of redeemable noncontrolling interests to redemption value	3.6	3.6				3.6
BALANCE (in shares) at Sep. 30, 2015			1.9	135.1	262.0				(40.7)
Balance—September 30, 2016 at Sep. 30, 2015	893.3	874.5	$ 0.0	$ 1.4	$ 2.6	1,991.1	(68.2)	(286.1)	$ (766.3)	18.8
BALANCE at Jun. 30, 2015	86.3
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income	3.0
Other comprehensive income	0.1
Distribution to noncontrolling interests, net	(1.4)
Adjustment of redeemable noncontrolling interests to redemption value	(3.6)
BALANCE at Sep. 30, 2015	84.4
BALANCE (in shares) at Jun. 30, 2016			1.7	138.7	262.0				(63.6)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class B to Class A Common Stock (in shares)				262.0	(262.0)
Conversion of Class B to Class A Common Stock	0.0	0.0		$ 2.6	$ (2.6)
Purchase of Class A Common Stock (in shares)									1.4
Purchase of Class A Common Stock	(36.3)	(36.3)							$ (36.3)
Exercise of employee stock options and restricted stock units and related tax benefits (in shares)				0.7
Exercise of employee stock options and restricted stock units and related tax benefits	6.2	6.2		$ 0.1		6.1
Share-based compensation expense	2.9	2.9				2.9
Dividends	(93.3)	(93.3)				(93.3)
Net income	8.2	0.0					0.0			8.2
Other comprehensive income (loss)	7.8	7.8						7.8
Distribution to noncontrolling interests, net	0.0	0.0
Adjustment of redeemable noncontrolling interests to redemption value	3.5	3.5				3.5
BALANCE (in shares) at Sep. 30, 2016			1.7	401.4	0.0				(65.0)
Balance—September 30, 2016 at Sep. 30, 2016	266.1	$ 251.0	$ 0.0	$ 4.1	$ 0.0	$ 1,957.6	$ (37.0)	$ (231.9)	$ (1,441.8)	$ 15.1
BALANCE at Jun. 30, 2016	73.3
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income	1.6
Distribution to noncontrolling interests, net	(1.1)
Adjustment of redeemable noncontrolling interests to redemption value	(3.5)
BALANCE at Sep. 30, 2016	$ 70.3