CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net revenues	$ 2,511.2	$ 2,637.6	$ 4,542.5	$ 4,875.9
Cost of sales	956.7	1,024.9	1,765.8	1,899.1
Gross profit	1,554.5	1,612.7	2,776.7	2,976.8
Selling, general and administrative expenses	1,284.0	1,319.2	2,406.3	2,510.3
Amortization expense	88.5	89.6	181.0	167.8
Restructuring costs	21.5	21.7	37.0	32.9
Acquisition-related costs	0.0	7.0	0.0	61.1
Asset impairment charges	965.1	0.0	977.7	0.0
Operating (loss) income	(804.6)	175.2	(825.3)	204.7
Interest expense, net	68.3	60.3	132.4	126.7
Other expense, net	4.8	4.2	7.5	8.7
(Loss) income before income taxes	(877.7)	110.7	(965.2)	69.3
Provision (benefit) for income taxes	78.3	(7.9)	0.9	(33.2)
Net (loss) income	(956.0)	118.6	(966.1)	102.5
Net income (loss) attributable to noncontrolling interests	0.6	(1.9)	1.8	(4.1)
Net income attributable to redeemable noncontrolling interests	4.0	11.3	4.8	17.1
Net (loss) income attributable to Coty Inc.	$ (960.6)	$ 109.2	$ (972.7)	$ 89.5
Net (loss) income attributable to Coty Inc. per common share:
Basic (in usd per share)	$ (1.28)	$ 0.15	$ (1.30)	$ 0.12
Diluted (in usd per share)	$ (1.28)	$ 0.15	$ (1.30)	$ 0.12
Weighted-average common shares outstanding:
Basic (in shares)	751.1	749.6	751.0	749.1
Diluted (in shares)	751.1	752.7	751.0	752.5