DEBT - Schedule of Debt (Details) € in Millions, $ in Millions	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Dec. 06, 2024 USD ($)	Dec. 06, 2024 EUR (€)	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Short-term debt	$ 0.0				$ 0.0
Long term debt	3,998.7
Finance lease obligations & other long term debt	9.7				4.3
Total debt	4,008.4				3,913.7
Less: Short-term debt and current portion of long-term debt	(3.5)				(3.0)
Total Long-term debt	4,004.9				3,910.7
Less: Unamortized financing fees and discounts on long-term debt	(49.4)				(68.9)
Total Long-term debt, net	$ 3,955.5				$ 3,841.8
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt, net	Long-term debt, net			Long-term debt, net
Senior Notes | 2026 Dollar Senior Secured Notes due April 2026
Debt Instrument [Line Items]
Long term debt	$ 350.0				$ 650.0
Senior Notes | 2026 Euro Senior Secured Notes due April 2026
Debt Instrument [Line Items]
Long term debt	820.0	€ 700.0			748.1
Senior Notes | 2027 Euro Senior Secured Notes due May 2027
Debt Instrument [Line Items]
Long term debt	585.7				534.3
Senior Notes | 2028 Euro Senior Secured Notes due September 2028
Debt Instrument [Line Items]
Long term debt	585.7				534.3
Senior Notes | 2029 Dollar Senior Secured Notes due January 2029
Debt Instrument [Line Items]
Long term debt	500.0				500.0
Senior Notes | 2030 Dollar Senior Secured Notes due July 2030
Debt Instrument [Line Items]
Long term debt	750.0				750.0
Senior Notes | 2026 Euro Notes due April 2026
Debt Instrument [Line Items]
Long term debt	300.0		$ 190.6	€ 180.3	250.0
Senior Notes | Term Loan | 2026 Euro Notes due April 2026
Debt Instrument [Line Items]
Long term debt	0.0				192.7
Line of Credit | Revolving credit facility | 2023 Coty Revolving Credit Facility due July 2028
Debt Instrument [Line Items]
Long term debt	$ 407.3				$ 0.0