PENSION AND POST-RETIREMENT BENEFITS - Summary of Unrecognized Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 311.7
Prior service cost	0.9
Accumulated Other Comprehensive Loss, Gross	312.6
Income tax benefit	(51.5)
Portion allocated (to) from Revlon Holdings	(0.6)
Accumulated other comprehensive loss, net	260.5
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	306.6
Prior service cost	0.9
Accumulated Other Comprehensive Loss, Gross	307.5	$ 266.1
Income tax benefit	(50.6)	(48.7)
Portion allocated (to) from Revlon Holdings	(0.8)	(0.8)
Accumulated other comprehensive loss, net	256.1	216.6
Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	5.1
Prior service cost	0.0
Accumulated Other Comprehensive Loss, Gross	5.1	4.0
Income tax benefit	(0.9)	(1.0)
Portion allocated (to) from Revlon Holdings	0.2	0.2
Accumulated other comprehensive loss, net	$ 4.4	$ 3.2

Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax

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Defined Benefit Plan Accumulated Other Comprehensive Income Loss After Tax Portion Attributable To Related Party

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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