REVENUE RECOGNITION (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jul. 01, 2018	Jun. 30, 2018
ASSETS
Property and equipment, net	$ 1,609.2		$ 1,609.2		$ 1,674.6	$ 1,680.8
Deferred income taxes	183.3		183.3		108.0	107.4
Other noncurrent assets	151.5		151.5		306.4	299.5
Current liabilities:
Accrued expenses and other current liabilities	1,488.0		1,488.0		1,865.1	1,844.4
Deferred income taxes	836.0		836.0		841.3	842.5
Accumulated deficit	(1,741.8)		(1,741.8)		$ (644.4)	(626.2)
Net revenues	1,990.6	$ 2,222.7	6,533.1	$ 7,098.6
Selling, general and administrative expenses	1,070.5	1,251.6	3,476.8	3,761.9
Net (loss) income	(4.0)	(60.1)	(970.1)	42.4
Net (loss) income attributable to Coty Inc.	$ (12.1)	$ (77.0)	$ (984.8)	$ 12.5
Net (loss) income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ (0.02)	$ (0.10)	$ (1.31)	$ 0.02
Diluted (in dollars per share)	$ (0.02)	$ (0.10)	$ (1.31)	$ 0.02
Calculated under Revenue Guidance in Effect before Topic 606
ASSETS
Property and equipment, net						1,680.8
Deferred income taxes						107.4
Other noncurrent assets						299.5
Current liabilities:
Accrued expenses and other current liabilities						1,844.4
Deferred income taxes						842.5
Accumulated deficit						(626.2)
Net revenues	$ 2,016.2		$ 6,542.0
Selling, general and administrative expenses	1,071.5		3,479.1
Net (loss) income	14.4		(965.1)
Net (loss) income attributable to Coty Inc.	$ 6.5		$ (979.8)
Net (loss) income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ 0.01		$ (1.30)
Diluted (in dollars per share)	$ 0.01		$ (1.30)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
ASSETS
Property and equipment, net						(6.2)
Deferred income taxes						0.6
Other noncurrent assets						6.9
Current liabilities:
Accrued expenses and other current liabilities						20.7
Deferred income taxes						(1.2)
Accumulated deficit						$ (18.2)
Net revenues	$ 25.6		$ 8.9
Selling, general and administrative expenses	1.0		2.3
Net (loss) income	18.4		5.0
Net (loss) income attributable to Coty Inc.	$ 18.6		$ 5.0
Net (loss) income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ 0.03		$ 0.01
Diluted (in dollars per share)	$ 0.03		$ 0.01
Furniture and Fixtures | Minimum
Net (loss) income attributable to Coty Inc. per common share:
Property, plant and equipment			3 years
Furniture and Fixtures | Maximum
Net (loss) income attributable to Coty Inc. per common share:
Property, plant and equipment			5 years