PENSION AND POST-RETIREMENT BENEFITS - Summary of Amounts Recognized in Respect to Pension Plans and Other Post-retirement Benefit Plans (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Other Assets	$ 118.4	$ 103.5	[1]
Accrued expenses and other	(412.8)	(382.9)	[1]
Pension and other post-retirement benefit liabilities	(172.8)	(184.1)	[1]
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]
Other Assets	1.5	0.0
Accrued expenses and other	(6.2)	(6.1)
Pension and other post-retirement benefit liabilities	(159.5)	(170.4)
Total liability	(164.2)	(176.5)
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]
Other Assets	0.0	0.0
Accrued expenses and other	(0.7)	(0.8)
Pension and other post-retirement benefit liabilities	(13.3)	(12.6)
Total liability	(14.0)	(13.4)
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

[1] Adjusted as a result of the adoption of certain accounting pronouncements as of December 31, 2017. See Note 1, "Description of Business and Summaryof Significant Accounting Policies - Recently Adopted Accounting Pronouncements," for details of these adjustments.