EMPLOYEE BENEFIT PLANS - Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	$ 29.2	$ (79.5)
Amortization of prior service (credit) cost	(6.7)	(5.7)
Curtailment recognition of prior service credit (cost)	(3.3)	0.0
Recognized net actuarial (gain) loss	(0.5)	(1.3)
Prior service credit (cost)	0.0	10.3
Effect of exchange rates	0.2	(0.4)
Total recognized in OCI/(L)	18.9	(76.6)
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	5.2	(4.1)
Amortization of prior service (credit) cost	(5.9)	(5.9)
Curtailment recognition of prior service credit (cost)	(0.4)	0.0
Recognized net actuarial (gain) loss	(0.6)	(0.1)
Prior service credit (cost)	0.0	0.0
Effect of exchange rates	0.0	0.0
Total recognized in OCI/(L)	(1.7)	(10.1)
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	(1.6)	(0.8)
Amortization of prior service (credit) cost	0.0	0.0
Curtailment recognition of prior service credit (cost)	0.0	0.0
Recognized net actuarial (gain) loss	0.7	(0.7)
Prior service credit (cost)	0.0	0.0
Effect of exchange rates	0.0	0.0
Total recognized in OCI/(L)	(0.9)	(1.5)
International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	25.6	(74.6)
Amortization of prior service (credit) cost	(0.8)	0.2
Curtailment recognition of prior service credit (cost)	(2.9)	0.0
Recognized net actuarial (gain) loss	(0.6)	(0.5)
Prior service credit (cost)	0.0	10.3
Effect of exchange rates	0.2	(0.4)
Total recognized in OCI/(L)	$ 21.5	$ (65.0)