EMPLOYEE BENEFIT PLANS - Reconciliation of the Projected Benefit Obligations, Plan Assets, Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	$ 865.6	$ 803.3
Service cost	34.2	34.5	$ 40.2
Interest cost	11.4	15.6	15.3
Plan participants’ contributions	6.4	7.2
Plan amendments	0.0	(10.3)
Benefits paid	(20.3)	(20.0)
New employees transfers in	18.7	16.2
Premiums paid	(2.3)	(2.5)
Pension curtailment	(12.0)	(5.4)
Pension settlement	(39.0)	(37.4)
Actuarial loss (gain)	(33.2)	74.8
Effect of exchange rates	(4.1)	(10.9)
Other	0.0	0.5
Benefit obligation - ending balance	825.4	865.6	803.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	268.9	262.2
Actual return on plan assets	3.4	3.5
Employer contributions	36.4	39.3
Plan participants’ contributions	6.4	7.2
Benefits paid	(19.9)	(20.0)
New employees transfers in	18.7	16.2
Premiums paid	(2.2)	(2.5)
Plan settlements	(39.0)	(37.4)
Effect of exchange rates	1.9	(0.1)
Other	0.0	0.5
Fair value of plan assets - ending balance	274.6	268.9	262.2
Reclassification of net obligation to held for sale liabilities	140.8	145.8
Funded status	(410.0)	(450.9)
Other Post-Employment Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	57.8	53.2
Service cost	1.1	1.2	1.4
Interest cost	1.7	2.1	2.0
Plan participants’ contributions	0.3	0.2
Plan amendments	0.0	0.0
Benefits paid	(2.1)	(1.8)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Pension curtailment	(0.8)	0.0
Pension settlement	0.0	0.0
Actuarial loss (gain)	(4.2)	4.1
Effect of exchange rates	(0.1)	(0.1)
Other	0.0	(1.1)
Benefit obligation - ending balance	53.7	57.8	53.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	0.4	0.4
Actual return on plan assets	0.0	0.0
Employer contributions	1.9	1.6
Plan participants’ contributions	0.3	0.2
Benefits paid	(2.1)	(1.8)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Plan settlements	0.0	0.0
Effect of exchange rates	0.0	0.0
Other	0.0	0.0
Fair value of plan assets - ending balance	0.5	0.4	0.4
Reclassification of net obligation to held for sale liabilities	0.0	0.0
Funded status	(53.2)	(57.4)
United States | Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	17.7	17.5
Service cost	0.0	0.0	0.0
Interest cost	0.6	0.7	0.7
Plan participants’ contributions	0.0	0.0
Plan amendments	0.0	0.0
Benefits paid	(1.4)	(1.3)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Pension curtailment	0.0	0.0
Pension settlement	0.0	0.0
Actuarial loss (gain)	1.6	0.8
Effect of exchange rates	0.0	0.0
Other	0.0	0.0
Benefit obligation - ending balance	18.5	17.7	17.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	1.3	1.3
Plan participants’ contributions	0.0	0.0
Benefits paid	(1.3)	(1.3)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Plan settlements	0.0	0.0
Effect of exchange rates	0.0	0.0
Other	0.0	0.0
Fair value of plan assets - ending balance	0.0	0.0	0.0
Reclassification of net obligation to held for sale liabilities	0.0	0.0
Funded status	(18.5)	(17.7)
International | Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	790.1	732.6
Service cost	33.1	33.3	38.8
Interest cost	9.1	12.8	12.6
Plan participants’ contributions	6.1	7.0
Plan amendments	0.0	(10.3)
Benefits paid	(16.8)	(16.9)
New employees transfers in	18.7	16.2
Premiums paid	(2.3)	(2.5)
Pension curtailment	(11.2)	(5.4)
Pension settlement	(39.0)	(37.4)
Actuarial loss (gain)	(30.6)	69.9
Effect of exchange rates	(4.0)	(10.8)
Other	0.0	1.6
Benefit obligation - ending balance	753.2	790.1	732.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	268.5	261.8
Actual return on plan assets	3.4	3.5
Employer contributions	33.2	36.4
Plan participants’ contributions	6.1	7.0
Benefits paid	(16.5)	(16.9)
New employees transfers in	18.7	16.2
Premiums paid	(2.2)	(2.5)
Plan settlements	(39.0)	(37.4)
Effect of exchange rates	1.9	(0.1)
Other	0.0	0.5
Fair value of plan assets - ending balance	274.1	268.5	$ 261.8
Reclassification of net obligation to held for sale liabilities	140.8	145.8
Funded status	$ (338.3)	$ (375.8)