EMPLOYEE BENEFIT PLANS - Reconciliation of the Projected Benefit Obligations, Plan Assets, Funded Status (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance		$ 803.3	$ 791.4
Service cost		34.5	40.2	$ 36.7
Interest cost		15.6	15.3	10.0
Plan participants’ contributions		7.2	7.3
Plan amendments		(10.3)	0.0
Benefits paid		(20.0)	(56.0)
New employees transfers in		16.2	23.5
Premiums paid		(2.5)	(2.7)
Pension curtailment		(5.4)	(10.1)
Pension settlement		(37.4)	(1.0)
Actuarial loss (gain)		74.8	(9.5)
Effect of exchange rates		(10.9)	4.9
Other		0.5	0.0
Benefit obligation - ending balance	$ 865.6	865.6	803.3	791.4
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance		262.2	234.6
Actual return on plan assets		3.5	18.8
Employer contributions		39.3	39.8
Plan participants’ contributions		7.2	7.3
Benefits paid		(20.0)	(55.6)
New employees transfers in		16.2	23.5
Premiums paid		(2.5)	(2.7)
Plan settlements		(37.4)	(1.0)
Effect of exchange rates		(0.1)	(2.5)
Other		(0.5)	0.0
Fair value of plan assets - ending balance	268.9	268.9	262.2	234.6
Funded status	(596.7)	(596.7)	(541.1)
Other Post-Employment Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance		53.2	63.8
Service cost		1.2	1.4	1.9
Interest cost		2.1	2.0	1.8
Plan participants’ contributions		0.2	0.2
Plan amendments		0.0	0.0
Benefits paid		(1.8)	(1.6)
New employees transfers in		0.0	0.0
Premiums paid		0.0	0.0
Pension curtailment		0.0	(10.4)
Pension settlement		0.0	0.0
Actuarial loss (gain)		4.1	(2.5)
Effect of exchange rates		(0.1)	0.3
Other		(1.1)	0.0
Benefit obligation - ending balance	57.8	57.8	53.2	63.8
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		1.6	1.4
Plan participants’ contributions		0.2	0.2
Benefits paid		(1.8)	(1.6)
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	0.4	0.4	0.4	0.4
Funded status	(57.4)	(57.4)	(52.8)
United States | Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance		17.5	18.8
Service cost		0.0	0.0	0.0
Interest cost		0.7	0.7	1.6
Plan participants’ contributions		0.0	0.0
Plan amendments		0.0	0.0
Benefits paid		(1.3)	(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)		0.8	(0.7)
Effect of exchange rates		0.0	0.0
Other		0.0	0.0
Benefit obligation - ending balance	17.7	17.7	17.5	18.8
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	0.0
Funded status	(17.7)	(17.7)	(17.5)
International | Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance		732.6	708.8
Service cost		33.3	38.8	34.8
Interest cost		12.8	12.6	6.6
Plan participants’ contributions		7.0	7.1
Plan amendments	(10.3)	(10.3)	0.0
Benefits paid		(16.9)	(53.1)
New employees transfers in		16.2	23.5
Premiums paid		(2.5)	(2.7)
Pension curtailment		(5.4)	0.3
Pension settlement		(37.4)	(1.0)
Actuarial loss (gain)		69.9	(6.3)
Effect of exchange rates		(10.8)	4.6
Other		1.6	0.0
Benefit obligation - ending balance	790.1	790.1	732.6	708.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance		261.8	234.2
Actual return on plan assets		3.5	18.8
Employer contributions		36.4	37.1
Plan participants’ contributions		7.0	7.1
Benefits paid		(16.9)	(52.7)
New employees transfers in		16.2	23.5
Premiums paid		(2.5)	(2.7)
Plan settlements		(37.4)	(1.0)
Effect of exchange rates		(0.1)	(2.5)
Other		(0.5)	0.0
Fair value of plan assets - ending balance	268.5	268.5	261.8	$ 234.2
Funded status	$ (521.6)	$ (521.6)	$ (470.8)