EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 159.1	$ 274.6	$ 268.9
International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	159.1	274.1	268.5
International | Pension Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	75.2	148.0	$ 143.2
International | Pension Plans | Recurring
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	159.1	274.6
International | Pension Plans | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	83.9	126.6
International | Pension Plans | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	75.2	148.0
International | Pension Plans | Recurring | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	50.7	67.5
International | Pension Plans | Recurring | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	50.7	67.5
International | Pension Plans | Recurring | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Corporate securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	33.0	58.6
International | Pension Plans | Recurring | Corporate securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	33.0	58.6
International | Pension Plans | Recurring | Corporate securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Corporate securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.2	0.5
International | Pension Plans | Recurring | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.2	0.5
International | Pension Plans | Recurring | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		0.0
International | Pension Plans | Recurring | Insurance contracts and other
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	75.2	148.0
International | Pension Plans | Recurring | Insurance contracts and other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Insurance contracts and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Insurance contracts and other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 75.2	$ 148.0