EMPLOYEE BENEFITS (Components of Net Periodic (Benefit) Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.6	$ 0.8
Interest cost	0.9	0.9
Expected return on plan assets	(1.3)	(1.4)
Amortization of service cost from earlier periods	0.2	0.2
Gain on curtailment		(0.4)
Net periodic pension benefit cost	0.4	0.1
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1
Net periodic pension benefit cost	$ 0.1	$ 0.1