RESTRUCTURING COSTS - Restructuring Costs by Type (Details) - USD ($) $ in Millions	12 Months Ended					60 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 36.7	$ (6.5)	$ (6.5)
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(2.5)	(6.5)	(6.5)	$ 73.2	$ 156.6	$ 214.3
Severance and Employee Benefits | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(2.5)	(6.5)	(6.2)	73.4	151.2	209.4
Fixed Asset Write-offs | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.0	0.0	(0.5)	(1.1)	(1.6)
Other Exit Costs | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ 0.0	$ (0.3)	$ 0.3	$ 6.5	$ 6.5