CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (60.1)	$ (159.4)	$ 42.4	$ (97.5)
Other comprehensive income:
Foreign currency translation adjustment	247.4	87.1	518.5	(9.2)
Net unrealized derivative gains on cash flow hedges, net of taxes of $1.5 and $(1.8), and $(2.5) and $(10.5) during the three and nine months ended, respectively	6.9	3.0	14.2	44.9
Pension and other post-employment benefits adjustment, net of tax of $(0.7) and nil, and $(0.7) and $(5.8) during the three and nine months ended, respectively	(2.3)	0.0	(0.7)	10.1
Total other comprehensive income (loss), net of tax	252.0	90.1	532.0	45.8
Comprehensive income (loss)	191.9	(69.3)	574.4	(51.7)
Comprehensive income (loss) attributable to noncontrolling interests:
Net income (loss)	1.1	3.5	(3.0)	14.2
Foreign currency translation adjustment	(0.2)	0.3	0.3	(0.2)
Total comprehensive income (loss) attributable to noncontrolling interests	0.9	3.8	(2.7)	14.0
Comprehensive income attributable to redeemable noncontrolling interests:
Net income	15.8	1.3	32.9	5.7
Foreign currency translation adjustment	0.0	0.0	0.0	0.0
Total comprehensive income attributable to redeemable noncontrolling interests	15.8	1.3	32.9	5.7
Comprehensive income (loss) attributable to Coty Inc.	$ 175.2	$ (74.4)	$ 544.2	$ (71.4)