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