PENSION AND POST-RETIREMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net periodic benefit costs:
Total net periodic benefit costs	$ 4.0	$ 7.2
Pension Plans
Net periodic benefit costs:
Service cost	1.7	1.9
Interest cost	15.0	20.0
Expected return on plan assets	(22.8)	(25.1)
Amortization of actuarial loss	11.0	9.9
Curtailment and Settlement gain	(1.5)	0.0
Total net periodic benefit costs prior to allocation	3.4	6.7
Portion allocated to Revlon Holdings	(0.1)	(0.1)
Total net periodic benefit costs	3.3	6.6
Other Post-Retirement Benefit Plans
Net periodic benefit costs:
Service cost	0.0	0.0
Interest cost	0.3	0.4
Expected return on plan assets	0.0	0.0
Amortization of actuarial loss	0.4	0.2
Curtailment and Settlement gain	0.0	0.0
Total net periodic benefit costs prior to allocation	0.7	0.6
Portion allocated to Revlon Holdings	0.0	0.0
Total net periodic benefit costs	$ 0.7	$ 0.6