DEBT - Schedule of debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Jun. 30, 2024
Debt Instrument [Line Items]
Short-term debt	$ 5.1	$ 0.0
Long-term debt	3,843.2
Finance lease obligations & other long term debt	10.5	4.3
Total debt	3,858.8	3,913.7
Less: Short-term debt and current portion of long-term debt	(9.4)	(3.0)
Total Long-term debt	3,849.4	3,910.7
Less: Unamortized financing fees and discounts on long-term debt	(53.3)	(68.9)
Total Long-term debt, net	3,796.1	3,841.8
Senior Secured Notes | 2026 Dollar Senior Secured Notes due April 2026
Debt Instrument [Line Items]
Long-term debt	350.0	650.0
Senior Secured Notes | 2026 Euro Senior Secured Notes due April 2026
Debt Instrument [Line Items]
Long-term debt	758.3	748.1
Senior Secured Notes | 2027 Euro Senior Secured Notes due May 2027
Debt Instrument [Line Items]
Long-term debt	541.6	534.3
Senior Secured Notes | 2028 Euro Senior Secured Notes due September 2028
Debt Instrument [Line Items]
Long-term debt	541.6	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	401.7	0.0
Current portion of long-term debt includes swingline loans outstanding	0.0	0.0
Line of Credit | 2026 Euro Notes due April 2026 | Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 192.7