EMPLOYEE BENEFIT PLANS - Reconciliations of Level 3 Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	$ 268.9	$ 262.2
Return on plan assets	3.4	3.5
Effect of exchange rates	1.9	(0.1)
Fair value of plan assets - ending balance	274.6	268.9
International | Pension Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	268.5	261.8
Return on plan assets	3.4	3.5
Effect of exchange rates	1.9	(0.1)
Fair value of plan assets - ending balance	274.1	268.5
International | Pension Plans | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	143.2	143.7
Return on plan assets	4.3	(0.2)
Purchases, sales and settlements, net	(2.8)	(2.5)
Effect of exchange rates	3.3	2.2
Fair value of plan assets - ending balance	$ 148.0	$ 143.2