RESTRUCTURING COSTS - Restructuring Costs by Program (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 30.1	$ 4.8
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	31.2	7.6	$ 156.6
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (1.1)	$ (2.8)