RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2024	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	$ 28.4	$ (1.2)
2024 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related costs	30.0
Restructuring costs incurred to date	29.9
Restructuring expense (income)	28.6	0.0
Restructuring reserve	29.9					$ 0.0
2024 Restructuring Actions | Forecast
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			$ 6.8	$ 13.8	$ 9.3
Transformation Plan and Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	215.3
Restructuring expense (income)	(0.2)	$ (1.2)
Restructuring reserve	$ 7.5					$ 10.0
Restructuring and related activities, plan term (in years)	4 years
Transformation Plan and Other | Forecast
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			$ 6.1	$ 0.1	$ 1.3