EMPLOYEE BENEFITS (Amounts in AOCI not Recognized as Components of Net Periodic Benefit Cost) (Details) $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Total plans, at the beginning of period	$ (0.8)
Total plans - Deferrals	(10.8)
Total plans - Net Change in AOCL	(10.8)
Total plans, at the end of period	(11.6)
Post-retirement benefit plans
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial (loss)/gain, at the beginning of period	(1.2)
Deferred income tax benefit/(expense), at the beginning of period	(0.4)
Total plans, at the beginning of period	(0.8)
Net actuarial/(loss) gain - Deferrals	(0.4)
Total plans - Deferrals	(0.4)
Net actuarial/(loss) gain - Net Change in AOCL	(0.4)
Total plans - Net Change in AOCL	(0.4)
Net actuarial/(loss) gain, at the end of period	(1.6)
Deferred income tax benefit/(expense), at the end of period	0.4
Total plans, at the end of period	(1.2)
Pension plans
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial/(loss) gain - Deferrals	(6.0)
Prior service benefit/(cost) - Deferrals	(8.1)
Deferred income tax benefit/(expense) - Deferrals	3.7
Total plans - Deferrals	(10.4)
Net actuarial/(loss) gain - Net Change in AOCL	(6.0)
Prior service benefit/(cost) - Net Change in AOCL	(8.1)
Deferred income tax benefit/(expense) - Net Change in AOCL	3.7
Total plans - Net Change in AOCL	10.4
Net actuarial/(loss) gain, at the end of period	(6.0)
Prior service benefit/(cost), at the end of period	(8.1)
Deferred income tax benefit/(expense), at the end of period	3.7
Total plans, at the end of period	$ (10.4)