CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net revenues	$ 2,637.6	$ 2,296.7	$ 4,875.9	$ 3,376.9
Cost of sales	1,025.0	892.3	1,899.3	1,337.1
Gross profit	1,612.6	1,404.4	2,976.6	2,039.8
Selling, general and administrative expenses	1,319.9	1,170.2	2,511.7	1,649.1
Amortization expense	89.6	95.2	167.8	116.4
Restructuring costs	21.7	15.8	32.9	23.2
Acquisition-related costs	7.0	135.9	61.1	217.4
Operating income (loss)	174.4	(12.7)	203.1	33.7
Interest expense, net	60.3	57.9	126.7	98.3
Other expense (income), net	3.4	(0.6)	7.1	0.7
Income (loss) before income taxes	110.7	(70.0)	69.3	(65.3)
Benefit for income taxes	(7.9)	(122.1)	(33.2)	(127.2)
Net income	118.6	52.1	102.5	61.9
Net (loss) income attributable to noncontrolling interests	(1.9)	2.5	(4.1)	10.7
Net income attributable to redeemable noncontrolling interests	11.3	2.8	17.1	4.4
Net income attributable to Coty Inc.	$ 109.2	$ 46.8	$ 89.5	$ 46.8
Net income attributable to Coty Inc. per common share:
Basic (in dollars per share)	$ 0.15	$ 0.06	$ 0.12	$ 0.09
Diluted (in dollars per share)	$ 0.15	$ 0.06	$ 0.12	$ 0.09
Weighted-average common shares outstanding:
Basic (in shares)	749.6	746.6	749.1	539.8
Diluted (in shares)	752.7	752.4	752.5	545.8