EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 36.7	$ 7.6	$ 7.4
Interest cost	10.0	8.9	10.3
Expected return on plan assets	(7.2)	(3.7)	(4.2)
Amortization of prior service (credit) cost	(5.7)	(5.7)	(2.8)
Amortization of net loss (gain)	6.6	3.8	5.0
Settlements loss (gain) recognized	15.4	0.1	1.1
Curtailment (gain) loss recognized	(2.2)	(1.8)	(0.6)
Net periodic benefit cost	53.6	9.2	16.2
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.9	1.1	1.9
Interest cost	1.8	1.9	2.7
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service (credit) cost	(5.9)	(5.9)	(3.1)
Amortization of net loss (gain)	0.1	0.0	(0.1)
Settlements loss (gain) recognized	0.0	0.0	(0.1)
Curtailment (gain) loss recognized	0.0	(1.8)	0.0
Net periodic benefit cost	(2.1)	(4.7)	1.3
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0
Interest cost	1.6	3.4	3.3
Expected return on plan assets	(0.9)	(2.6)	(3.0)
Amortization of prior service (credit) cost	0.0	0.0	0.0
Amortization of net loss (gain)	2.3	1.2	2.0
Settlements loss (gain) recognized	15.9	0.0	0.0
Curtailment (gain) loss recognized	0.0	0.0	0.0
Net periodic benefit cost	18.9	2.0	2.3
International Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	34.8	6.5	5.5
Interest cost	6.6	3.6	4.3
Expected return on plan assets	(6.3)	(1.1)	(1.2)
Amortization of prior service (credit) cost	0.2	0.2	0.3
Amortization of net loss (gain)	4.2	2.6	3.1
Settlements loss (gain) recognized	(0.5)	0.1	1.2
Curtailment (gain) loss recognized	(2.2)	0.0	(0.6)
Net periodic benefit cost	$ 36.8	$ 11.9	$ 12.6