PENSION AND POST-RETIREMENT BENEFITS - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 432.4	$ 497.2
United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	358.3	413.6
International Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 74.1	$ 83.6