RESTRUCTURING CHARGES - Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Liability Balance at period start	$ 13.8
Expense, Net	5.4
Foreign Currency Translation	(0.1)
Cash utilized, net	(11.0)
Non-cash utilized, net	0.0
Liability Balance at period end	8.1	$ 13.8
Revlon 2020 Restructuring Plan
Restructuring Reserve [Roll Forward]
Expense, Net	7.3
Revlon 2020 Restructuring Plan | Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	12.6
Expense, Net	5.4
Foreign Currency Translation	0.0
Cash utilized, net	(10.9)	(51.5)
Non-cash utilized, net	0.0
Liability Balance at period end	7.1	12.6
Revlon 2020 Restructuring Plan | Employee severance and other personnel benefits
Restructuring Reserve [Roll Forward]
Liability Balance at period start	12.6
Expense, Net	1.9
Foreign Currency Translation	0.0
Cash utilized, net	(7.6)
Non-cash utilized, net	0.0
Liability Balance at period end	6.9	12.6
Revlon 2020 Restructuring Plan | Other Costs
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.0
Expense, Net	3.5
Foreign Currency Translation	0.0
Cash utilized, net	(3.3)
Non-cash utilized, net	0.0
Liability Balance at period end	0.2	0.0
Other immaterial actions | Employee severance and other personnel benefits
Restructuring Reserve [Roll Forward]
Liability Balance at period start	1.2
Expense, Net	0.0
Foreign Currency Translation	(0.1)
Cash utilized, net	(0.1)
Non-cash utilized, net	0.0
Liability Balance at period end	$ 1.0	$ 1.2