EMPLOYEE BENEFIT PLANS - Pre-tax Amounts Recognized in AOCI (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	$ (24.9)	$ 0.7
Prior service credit (cost)	1.7	8.0
Total recognized in AOC(L)/I	(23.2)	8.7
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	6.9	4.2
Prior service credit (cost)	0.8	4.1
Total recognized in AOC(L)/I	7.7	8.3
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	0.3	(0.7)
Prior service credit (cost)	0.0	0.0
Total recognized in AOC(L)/I	0.3	(0.7)
International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	(32.1)	(2.8)
Prior service credit (cost)	0.9	3.9
Total recognized in AOC(L)/I	$ (31.2)	$ 1.1