RESTRUCTURING COSTS - Restructuring Costs by Program (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 6.0	$ 15.5
Turnaround Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	8.7	0.0
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(1.7)	6.5	$ 28.5	$ 106.5	$ 365.0
2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(0.8)	9.1
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (0.2)	$ (0.1)