PENSION AND POST-RETIREMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Net periodic benefit (income) costs:
Net periodic benefit (income) costs	$ 0.6	$ (0.1)	$ 1.5
Pension Plans [Member]
Net periodic benefit (income) costs:
Service cost	0.5	0.5
Interest cost	4.6	4.8
Expected return on plan assets	(7.0)	(7.1)
Amortization of actuarial loss	2.3	2.4
Curtailment gain	0.0	(0.8)
Net periodic benefit (income) costs, before allocation	0.4	(0.2)
Portion allocated to Revlon Holdings	0.0	(0.1)
Net periodic benefit (income) costs	0.4	(0.3)
Other Post-Retirement Benefit Plans [Member]
Net periodic benefit (income) costs:
Service cost	0.0	0.0
Interest cost	0.1	0.1
Expected return on plan assets	0.0	0.0
Amortization of actuarial loss	0.1	0.1
Curtailment gain	0.0	0.0
Net periodic benefit (income) costs, before allocation	0.2	0.2
Portion allocated to Revlon Holdings	0.0	0.0
Net periodic benefit (income) costs	$ 0.2	$ 0.2