PENSION AND POST-RETIREMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Net periodic benefit (income) costs:
Net periodic benefit (income) costs	$ 0.8	$ 0.8	$ 2.0	$ 1.9	$ 1.5
Pension Plans [Member]
Net periodic benefit (income) costs:
Service cost	0.5	0.6	1.5	1.9
Interest cost	4.6	4.9	13.9	14.7
Expected return on plan assets	(6.9)	(7.1)	(20.8)	(21.4)
Amortization of actuarial loss	2.4	2.3	6.9	7.1
Curtailment gain			0.0	(0.8)
Total net periodic benefit costs prior to allocation			1.5	1.5
Portion allocated to Revlon Holdings			(0.1)	(0.1)
Net periodic benefit (income) costs	0.6	0.7	1.4	1.4
Other Post-Retirement Benefit Plans [Member]
Net periodic benefit (income) costs:
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.1	0.1	0.3	0.3
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of actuarial loss	0.1	0.0	0.3	0.2
Curtailment gain			0.0	0.0
Total net periodic benefit costs prior to allocation			0.6	0.5
Portion allocated to Revlon Holdings			0.0	0.0
Net periodic benefit (income) costs	$ 0.2	$ 0.1	$ 0.6	$ 0.5