EMPLOYEE BENEFIT PLANS - Amounts in AOCI to be amortized (Details) $ in Millions	Jun. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Prior service (cost) credit	$ 5.7
Net gain (loss)	0.4
Total	6.1
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service (cost) credit	5.9
Net gain (loss)	0.1
Total	6.0
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service (cost) credit	0.0
Net gain (loss)	0.7
Total	0.7
International Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service (cost) credit	(0.2)
Net gain (loss)	(0.4)
Total	$ (0.6)