RESTRUCTURING COSTS - Summary of Global Initiative Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	$ 42.7	$ 155.8	$ 75.6	$ 179.0
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	21.3	$ 156.5	58.2	$ 170.1	$ 364.2
Restructuring costs incurred to date	422.4		422.4
Severance and Employee Benefits | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred			38.2		333.9
Restructuring costs incurred to date	372.1		372.1
Third-Party Contract Terminations | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred			15.8		22.4
Restructuring costs incurred to date	38.2		38.2
Fixed Asset Write-offs | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred			0.9		4.6
Restructuring costs incurred to date	5.5		5.5
Other Exit Costs | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred			3.3		$ 3.3
Restructuring costs incurred to date	$ 6.6		$ 6.6