RESTRUCTURING COSTS - Restructuring Costs By Program (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 21.7	$ 15.8	$ 32.9	$ 23.2
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	27.1	13.6	36.9	13.6	$ 364.2
Acquisition Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(3.3)	1.4	(3.3)	4.6
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (2.1)	$ 0.8	$ (0.7)	$ 5.0