BUSINESS COMBINATIONS - Narrative (Details) £ in Millions, shares in Millions, $ in Millions					1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 01, 2015 USD ($) shares	Jan. 02, 2014 USD ($)	Jan. 02, 2014 GBP (£)	Jul. 02, 2013 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) Acquisition	Jun. 30, 2014 USD ($) Acquisition	Jun. 30, 2013 USD ($)	Jan. 02, 2014 GBP (£)
Business Acquisition [Line Items]
Number of businesses acquired during period | Acquisition								1	2
Goodwill							$ 1,530.7	$ 1,530.7	$ 1,342.8
Acquisition-related costs								34.1	0.7	$ 8.9
Net revenues								4,395.2	4,551.6	4,649.1
Net loss								259.4	(64.2)	201.9
Color Cosmetics
Business Acquisition [Line Items]
Goodwill							677.3	677.3	538.2
Skin & Body Care
Business Acquisition [Line Items]
Goodwill							132.6	132.6	52.7
Fragrances
Business Acquisition [Line Items]
Goodwill							$ 720.8	$ 720.8	751.9
Bourjois
Business Acquisition [Line Items]
Purchase price	$ 376.8
Percentage of shares acquired	100.00%						100.00%	100.00%
Goodwill	$ 194.8
Net revenues from date of acquisition							$ 46.1
Net loss from date of acquisition							$ (16.1)
Acquisition-related costs								$ 3.9
Bourjois | Acquisition-related costs
Business Acquisition [Line Items]
Acquisition-related costs								3.9
Bourjois | Color Cosmetics
Business Acquisition [Line Items]
Goodwill	148.7
Bourjois | Skin & Body Care
Business Acquisition [Line Items]
Goodwill	11.1
Bourjois | Fragrances
Business Acquisition [Line Items]
Goodwill	$ 35.0
Bourjois | Common Class A
Business Acquisition [Line Items]
Number of shares issued | shares	15.5
Bourjois | Common Class A | Common Stock
Business Acquisition [Line Items]
Number of shares issued | shares	15.5
Fair Value of Coty Inc. Class A Stock	$ 376.8
Fair value of shares of Class A Common Stock	$ 376.8
StarAsia
Business Acquisition [Line Items]
Purchase price				$ 23.5
Percentage of shares acquired				100.00%
Goodwill				$ 11.5
Acquisition-related costs									0.4
Net revenues									24.6
Net loss									(4.4)
StarAsia | Selling, general and administrative
Business Acquisition [Line Items]
Acquisition-related costs								$ 0.0	0.4	$ 1.1
StarAsia | Color Cosmetics
Business Acquisition [Line Items]
Goodwill				0.7
StarAsia | Skin & Body Care
Business Acquisition [Line Items]
Goodwill				7.0
StarAsia | Fragrances
Business Acquisition [Line Items]
Goodwill				$ 3.8
Lena White Limited
Business Acquisition [Line Items]
Purchase price		$ 11.6	£ 7.0
Percentage of shares acquired		100.00%									100.00%
Goodwill		$ 2.0
Acquisition-related costs									0.1
Escrow deposit		0.8	0.5
Contingent consideration payable		$ 1.1	£ 0.7
Contingent consideration payable period		3 years	3 years
Contingent consideration, range of outcomes, low | £											£ 0.0
Contingent consideration, range of outcomes, high		$ 0.9									£ 0.6
Amount paid out for a portion of the contingent consideration					$ (0.8)	£ (0.5)
Net revenues									7.8
Net loss									(1.7)
Lena White Limited | Selling, general and administrative
Business Acquisition [Line Items]
Acquisition-related costs									$ 0.1
Adjustment to contingent consideration					$ (0.6)	£ 0.4
Lena White Limited | Color Cosmetics
Business Acquisition [Line Items]
Purchase price		11.6
Goodwill		$ 2.0