EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service period	90 days
Percent of Company match to plan	100.00%
Percent of employee salary eligible for contribution	6.00%
Curtailment gain	$ 6.9	$ 14.9	$ 5.4
Settlement loss	3.8	(0.2)	(0.8)
Actuarial loss (gain)	33.1	(33.2)
Net periodic benefit cost	17.8	15.9	29.5
Amount recognized in OCI/(L)	(13.4)	18.9
Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	6.2	14.4	12.2
Amount recognized in OCI/(L)	(19.2)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	35.9
Gain on plan assets	18.3
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	0.0	0.8	0.0
Settlement loss	0.0	0.0	0.0
Actuarial loss (gain)	(2.8)	(4.2)
Net periodic benefit cost	(1.1)	(4.0)	(2.7)
Amount recognized in OCI/(L)	(0.3)	(1.7)
Expected contributions	2.6
U.S.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	15.8	20.5	20.4
U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	0.0	0.0	0.0
Settlement loss	0.0	0.0	0.0
Actuarial loss (gain)	0.5	1.6
Accumulated benefit obligation	18.9	18.5
Net periodic benefit cost	2.0	1.3	0.0
Amount recognized in OCI/(L)	1.0	(0.9)
Expected contributions	2.0
International
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	12.0	14.1	12.9
International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	6.9	14.1	5.4
Settlement loss	3.8	(0.2)	(0.8)
Actuarial loss (gain)	35.4	(30.6)
Accumulated benefit obligation	498.4	712.1
Net periodic benefit cost	16.9	18.6	32.2
Amount recognized in OCI/(L)	(14.1)	21.5
Expected contributions	17.8
Transformation Plan | International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	6.9	$ 14.1
Settlement loss related to restructuring activities	3.8
Turnaround Plan, Current Year Restructuring Actions | International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Settlement loss related to restructuring activities	$ 2.3
Global Integration Activities | International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain			$ 5.1