CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (350.2)	$ 109.4	$ 523.2
Other comprehensive income (loss):
Foreign currency translation adjustment	58.6	(128.3)	49.4
Net unrealized derivative (loss) gain on cash flow hedges, net of taxes of $1.4, $(1.1) and $1.4, respectively	(3.2)	1.4	(3.6)
Pension and other post-employment benefits, net of taxes of $(3.8), $2.7 and $(4.9), respectively	6.4	(5.8)	10.1
Total other comprehensive income (loss), net of tax	61.8	(132.7)	55.9
Comprehensive (loss) income	(288.4)	(23.3)	579.1
Comprehensive (loss) attributable to noncontrolling interests:
Net income (loss)	5.3	5.3	(1.8)
Foreign currency translation adjustment	(0.1)	0.0	0.3
Total comprehensive income (loss) attributable to noncontrolling interests	5.2	5.3	(1.5)
Comprehensive income (loss) attributable to redeemable noncontrolling interests:
Net income	12.4	14.7	16.8
Foreign currency translation adjustment	0.2	0.0	0.1
Total comprehensive income attributable to redeemable noncontrolling interests	12.6	14.7	16.9
Comprehensive (loss) income attributable to Coty Inc.	$ (306.2)	$ (43.3)	$ 563.7