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, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Other long-term assets	$ 121.1	$ 130.8
Accrued expenses and other	(414.9)	(430.9)
Pension and other post-retirement benefit liabilities	(181.2)	(169.0)
Accumulated other comprehensive loss, gross	270.1
Income tax benefit	(49.7)
Portion allocated to Revlon Holdings	(0.6)
Accumulated other comprehensive loss, net	219.8
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Other long-term assets	3.6	4.8
Accrued expenses and other	(2.7)	(5.9)
Pension and other post-retirement benefit liabilities	(168.2)	(157.5)
Funded (unfunded) status of plan	(167.3)	(158.6)
Accumulated other comprehensive loss, gross	266.1	252.6
Income tax benefit	(48.7)	(44.4)
Portion allocated to Revlon Holdings	(0.8)	(0.8)
Accumulated other comprehensive loss, net	216.6	207.4
Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Other long-term assets	0.0	0.0
Accrued expenses and other	(0.4)	(0.7)
Pension and other post-retirement benefit liabilities	(13.0)	(11.5)
Funded (unfunded) status of plan	(13.4)	(12.2)
Accumulated other comprehensive loss, gross	4.0	2.7
Income tax benefit	(1.0)	(0.6)
Portion allocated to Revlon Holdings	0.2	0.0
Accumulated other comprehensive loss, net	$ 3.2	$ 2.1