EMPLOYEE BENEFIT PLANS - Fair value of Plan Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 95.6	$ 88.8	$ 83.4
Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	42.4	36.6	$ 37.5
Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	95.9	88.8
Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	10.3	33.1
Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	43.2	19.1
Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	42.4	36.6
Recurring | Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	15.8
Recurring | Domestic equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	15.8
Recurring | Domestic equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Domestic equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | International equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	4.4
Recurring | International equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	4.4
Recurring | International equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | International equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | U.S. Government and government agencies
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	18.9	17.2
Recurring | U.S. Government and government agencies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	5.8	4.9
Recurring | U.S. Government and government agencies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	13.1	12.3
Recurring | U.S. Government and government agencies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Corporate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	6.8	6.8
Recurring | Corporate securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Corporate securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	6.8	6.8
Recurring | Corporate securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Commingled bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	23.3	0.0
Recurring | Commingled bond fund | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Commingled bond fund | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	23.3	0.0
Recurring | Commingled bond fund | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	4.5	8.0
Recurring | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	4.5	8.0
Recurring | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	42.4	36.6
Recurring | Insurance contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Insurance contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	0.0	0.0
Recurring | Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 42.4	$ 36.6