RESTRUCTURING COSTS - Restructuring Costs By Program (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 21.5	$ 21.7	$ 37.0	$ 32.9
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	22.2	15.1	28.7	24.9	$ 106.5	$ 364.2
2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(0.3)	10.8	8.8	11.9
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (0.4)	$ (4.2)	$ (0.5)	$ (3.9)