RESTRUCTURING COSTS - Restructuring Costs By Program (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 15.5	$ 11.2
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6.5	9.8	$ 106.5	$ 364.2
2018 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	9.1	1.1
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (0.1)	$ 0.3