EMPLOYEE BENEFITS (Components of Net Periodic (Benefit) Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.8	$ 2.7
Interest cost	3.7	2.5
Expected return on plan assets	(5.3)	(3.8)
Amortization of service cost from earlier periods	0.8	0.4
Cost of curtailment	(1.0)
Cost of settlements	0.8	0.2
Net periodic pension benefit cost	1.8	2.0
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1
Interest cost	0.3	0.3
Net periodic pension benefit cost	$ 0.4	$ 0.4