RESTRUCTURING COSTS - Restructuring Costs By Program (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 11.2	$ 7.4
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	9.8	0.0	$ 364.2
Acquisition Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	3.2
Other Restructuring Programs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1.4	$ 4.2