EMPLOYEE BENEFIT PLANS - Pre-tax amounts recognized in AOCI (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	$ 52.2	$ 31.6
Prior service (cost) credit	14.3	19.9
Total recognized in AOC(L)/I	66.5	51.5
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	3.8	1.7
Prior service (cost) credit	16.3	22.2
Total recognized in AOC(L)/I	20.1	23.9
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	1.7	2.5
Prior service (cost) credit	0.0	0.0
Total recognized in AOC(L)/I	1.7	2.5
International Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	46.7	27.4
Prior service (cost) credit	(2.0)	(2.3)
Total recognized in AOC(L)/I	$ 44.7	$ 25.1