DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Debt Instrument [Line Items]
Short-term debt	$ 0.0	$ 0.0
Long-term debt	3,998.4
Finance lease obligations & other long term debt	3.8	4.3
Total debt	4,002.2	3,913.7
Less: Short-term debt and current portion of long-term debt	(3.3)	(3.0)
Total Long-term debt	3,998.9	3,910.7
Less: Unamortized financing fees and discounts on long-term debt	(64.5)	(68.9)
Total Long-term debt, net	3,934.4	3,841.8
Senior Secured Notes | 2026 Dollar Senior Secured Notes due April 2026
Debt Instrument [Line Items]
Long-term debt	650.0	650.0
Senior Secured Notes | 2026 Euro Senior Secured Notes due April 2026
Debt Instrument [Line Items]
Long-term debt	781.2	748.1
Senior Secured Notes | 2027 Euro Senior Secured Notes due May 2027
Debt Instrument [Line Items]
Long-term debt	558.0	534.3
Senior Secured Notes | 2028 Euro Senior Secured Notes due September 2028
Debt Instrument [Line Items]
Long-term debt	558.0	534.3
Senior Secured Notes | 2029 Dollar Senior Secured Notes due January 2029
Debt Instrument [Line Items]
Long-term debt	500.0	500.0
Senior Secured Notes | 2030 Dollar Senior Secured Notes due July 2030
Debt Instrument [Line Items]
Long-term debt	750.0	750.0
Line of Credit | Coty Revolving Credit Facility due July 2028 | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0.0	0.0
Line of Credit | 2026 Euro Notes due April 2026 | Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 201.2	$ 192.7