EMPLOYEE BENEFIT PLANS - Reconciliations of Level 3 plan assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	$ 234.6	$ 95.6
Plan assets from acquisitions	0.0	168.7
Return on plan assets	18.8	9.8
Effect of exchange rates	2.5	(3.6)
Fair value of plan assets - ending balance	262.2	234.6
Insurance contracts and other | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	130.2	42.4
Plan assets from acquisitions	0.0	75.7
Return on plan assets	14.0	4.7
Purchases, sales and settlements, net	3.9	5.3
Effect of exchange rates	(4.4)	2.1
Fair value of plan assets - ending balance	$ 143.7	$ 130.2