CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (4.0)	$ (60.1)	$ (970.1)	$ 42.4
Other comprehensive (loss) income:
Foreign currency translation adjustment	(18.6)	247.4	(127.5)	518.5
Net unrealized derivative (loss) gain on cash flow hedges, net of taxes of $3.4 and $1.5, and $8.9 and $(2.5) during the three and nine months ended, respectively	(11.0)	6.9	(28.7)	14.2
Pension and other post-employment benefits adjustment, net of tax of $2.0 and $(0.7), and $0.6 and $(0.7) during the three and nine months ended, respectively	(5.6)	(2.3)	(4.0)	(0.7)
Total other comprehensive (loss) income, net of tax	(35.2)	252.0	(160.2)	532.0
Comprehensive (loss) income	(39.2)	191.9	(1,130.3)	574.4
Comprehensive income (loss) attributable to noncontrolling interests:
Net income (loss)	2.3	1.1	4.1	(3.0)
Foreign currency translation adjustment	(0.1)	(0.2)	0.1	0.3
Total comprehensive income (loss) attributable to noncontrolling interests	2.2	0.9	4.2	(2.7)
Comprehensive income attributable to redeemable noncontrolling interests:
Net income attributable to redeemable noncontrolling interests	5.8	15.8	10.6	32.9
Comprehensive (loss) income attributable to Coty Inc.	$ (47.2)	$ 175.2	$ (1,145.1)	$ 544.2