PENSION AND POST-RETIREMENT BENEFITS - Summary of Unrecognized Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 257.7
Accumulated Other Comprehensive Loss, Gross	257.7
Income tax (benefit) expense	(44.2)
Portion allocated to Revlon Holdings	(1.1)
Accumulated other comprehensive loss, net	212.4
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	253.2
Accumulated Other Comprehensive Loss, Gross	253.2	$ 266.6
Income tax (benefit) expense	(43.3)	(44.3)
Portion allocated to Revlon Holdings	(0.9)	(0.9)
Accumulated other comprehensive loss, net	209.0	221.4
Other Post-Retirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	4.5
Accumulated Other Comprehensive Loss, Gross	4.5	3.6
Income tax (benefit) expense	(0.9)	(0.4)
Portion allocated to Revlon Holdings	(0.2)	(0.2)
Accumulated other comprehensive loss, net	$ 3.4	$ 3.0