PENSION AND POST-RETIREMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net periodic benefit (income) costs:
Curtailment gain	$ 20.7
Net periodic benefit (income) costs		$ 1.5	$ (0.6)	$ 18.8
Pension Plans [Member]
Net periodic benefit (income) costs:
Service cost		3.0	0.5	0.7
Interest cost		19.6	20.7	28.6
Expected return on plan assets		(28.6)	(31.0)	(40.3)
Amortization of actuarial loss		9.5	8.8	8.4
Lump sum settlement charge		0.0	0.0	20.7
Curtailment gain		(2.6)	0.0	0.0
Other pension settlements charge		0.0	0.0	0.3
Net periodic benefit (income) costs, before allocation		0.9	(1.0)	18.4
Portion allocated to Revlon Holdings		(0.1)	(0.1)	(0.1)
Net periodic benefit (income) costs		0.8	(1.1)	18.3
Other Post-Retirement Benefit Plans [Member]
Net periodic benefit (income) costs:
Service cost		0.0	0.0	0.0
Interest cost		0.4	0.4	0.5
Expected return on plan assets		0.0	0.0	0.0
Amortization of actuarial loss		0.3	0.2	0.1
Lump sum settlement charge		0.0	0.0	0.0
Curtailment gain		0.0	0.0	0.0
Other pension settlements charge		0.0	0.0	0.0
Net periodic benefit (income) costs, before allocation		0.7	0.6	0.6
Portion allocated to Revlon Holdings		0.0	(0.1)	(0.1)
Net periodic benefit (income) costs		$ 0.7	$ 0.5	$ 0.5