RESTRUCTURING COSTS - Restructuring Costs by Program (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (6.7)	$ 6.7	$ 134.2	$ 43.7
Turnaround Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6.0	0.0	152.6	0.0
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(11.8)	2.6	(16.2)	31.3	$ 28.5	$ 106.5	$ 365.0
2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(0.9)	4.5	(1.9)	13.3
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ (0.4)	$ (0.3)	$ (0.9)