EMPLOYEE BENEFIT PLANS - Reconciliation of the projected benefit obligations, plan assets, funded status (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	$ 791.4	$ 333.4
Service cost	40.2	36.7	$ 7.6
Interest cost	15.3	10.0	8.9
Plan participants’ contributions	7.3	15.2
Benefits paid	(32.5)	(14.1)
Premiums paid	(2.7)	(2.9)
Pension curtailment	(10.1)	(2.2)
Pension settlements	(1.0)	(83.2)
Actuarial (gain) loss	(9.5)	(84.5)
Acquired obligations	0.0	572.8
Effect of exchange rates	4.9	10.2
Other	0.0	0.0
Benefit obligation - ending balance	803.3	791.4	333.4
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	234.6	95.6
Actual return on plan assets	18.8	9.8
Employer contributions	39.8	41.7
Plan participants’ contributions	7.3	15.2
Benefits paid	(32.1)	(14.1)
Premiums paid	(2.7)	(2.9)
Plan settlements	(1.0)	(83.2)
Acquired plan assets	0.0	168.7
Effect of exchange rates	(2.5)	3.6
Other	0.0	(0.2)
Fair value of plan assets - ending balance	262.2	234.6	95.6
Funded status	(541.1)	(556.8)
Other Post-Employment Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	63.8	47.7
Service cost	1.4	1.9	1.1
Interest cost	2.0	1.8	1.9
Plan participants’ contributions	0.2	0.2
Benefits paid	(1.6)	(2.0)
Premiums paid	0.0	0.0
Pension curtailment	(10.4)	0.0
Pension settlements	0.0	0.0
Actuarial (gain) loss	(2.5)	(1.4)
Acquired obligations	0.0	15.4
Effect of exchange rates	0.3	0.1
Other	0.0	0.1
Benefit obligation - ending balance	53.2	63.8	47.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	0.4	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	1.4	1.8
Plan participants’ contributions	0.2	0.2
Benefits paid	(1.6)	(2.0)
Premiums paid	0.0	0.0
Plan settlements	0.0	0.0
Acquired plan assets	0.0	0.4
Effect of exchange rates	0.0	0.0
Other	0.0	0.0
Fair value of plan assets - ending balance	0.4	0.4	0.0
Funded status	(52.8)	(63.4)
U.S. Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	18.8	82.1
Service cost	0.0	0.0	0.0
Interest cost	0.7	1.6	3.4
Plan participants’ contributions	0.0	0.0
Benefits paid	(1.3)	(2.5)
Premiums paid	0.0	0.0
Pension curtailment	0.0	0.0
Pension settlements	0.0	(60.2)
Actuarial (gain) loss	(0.7)	(2.2)
Acquired obligations	0.0	0.0
Effect of exchange rates	0.0	0.0
Other	0.0	0.0
Benefit obligation - ending balance	17.5	18.8	82.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	0.0	53.2
Actual return on plan assets	0.0	(0.8)
Employer contributions	1.3	10.1
Plan participants’ contributions	0.0	0.0
Benefits paid	(1.3)	(2.5)
Premiums paid	0.0	0.0
Plan settlements	0.0	(60.2)
Acquired plan assets	0.0	0.0
Effect of exchange rates	0.0	0.0
Other	0.0	(0.2)
Fair value of plan assets - ending balance	0.0	0.0	53.2
Funded status	(17.5)	(18.8)
International Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance	708.8	203.6
Service cost	38.8	34.8	6.5
Interest cost	12.6	6.6	3.6
Plan participants’ contributions	7.1	15.0
Benefits paid	(29.6)	(9.6)
Premiums paid	(2.7)	(2.9)
Pension curtailment	0.3	(2.2)
Pension settlements	(1.0)	(23.0)
Actuarial (gain) loss	(6.3)	(80.9)
Acquired obligations	0.0	557.4
Effect of exchange rates	4.6	10.1
Other	0.0	(0.1)
Benefit obligation - ending balance	732.6	708.8	203.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance	234.2	42.4
Actual return on plan assets	18.8	10.6
Employer contributions	37.1	29.8
Plan participants’ contributions	7.1	15.0
Benefits paid	(29.2)	(9.6)
Premiums paid	(2.7)	(2.9)
Plan settlements	(1.0)	(23.0)
Acquired plan assets	0.0	168.3
Effect of exchange rates	(2.5)	3.6
Other	0.0	0.0
Fair value of plan assets - ending balance	261.8	234.2	$ 42.4
Funded status	$ (470.8)	$ (474.6)