STOCK COMPENSATION PLAN - Activity Related to Time-based and Performance-based RSUs and the Grant Date Fair Value (Details) - $ / shares		1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended	13 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Weighted Average Grant Date Fair Value Per RSU
Vesting period	3 years	2 years
TIP Plan | 2019 | TIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			200,600		200,600
Awards granted (in shares)					11,700
Awards vested (in shares)					(27,300)
Awards forfeited/canceled (in shares)					(36,800)
Outstanding, end of period (in shares)				148,200	148,200	148,200
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 15.95	$ 15.95	$ 15.95	$ 16.44
Awards granted, weighted average grant date fair value (in USD per share)					10.24
Awards vested, weighted average grant date fair value (in USD per share)					16.44
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 16.44
LTIP Plan | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			721,500		721,500
Awards granted (in shares)					626,600
Awards vested (in shares)					(295,800)
Awards forfeited/canceled (in shares)					(132,900)
Outstanding, end of period (in shares)				919,400	919,400	919,400
Weighted Average Grant Date Fair Value Per RSU
Vesting period					3 years
LTIP Plan | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			901,200		901,200
Awards granted (in shares)					626,700
Awards vested (in shares)					(14,200)
Awards forfeited/canceled (in shares)					(318,800)
Outstanding, end of period (in shares)				1,194,900	1,194,900	1,194,900
Weighted Average Grant Date Fair Value Per RSU
Vesting period					3 years
LTIP Plan | Restricted Stock
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)					30,992	36,452
LTIP Plan | 2020 | Time-Based LTIP
Restricted Stock Units
Awards granted (in shares)					626,600
Outstanding, end of period (in shares)				626,600	626,600	626,600
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 14.96	$ 14.96	$ 14.96
Awards granted, weighted average grant date fair value (in USD per share)					$ 14.96
LTIP Plan | 2020 | Performance-Based LTIP
Restricted Stock Units
Awards granted (in shares)					626,700
Outstanding, end of period (in shares)				626,700	626,700	626,700
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 14.96	$ 14.96	$ 14.96
Awards granted, weighted average grant date fair value (in USD per share)					$ 14.96
LTIP Plan | 2020 | Time-based and Performance-based RSU Awards
Restricted Stock Units
Awards granted (in shares)			1,300,000	0
LTIP Plan | 2019 | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			425,600		425,600
Awards granted (in shares)					0
Awards vested (in shares)					(133,900)
Awards forfeited/canceled (in shares)					(83,300)
Outstanding, end of period (in shares)				208,400	208,400	208,400
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 22.55	$ 22.55	$ 22.55	22.55
Awards granted, weighted average grant date fair value (in USD per share)					0
Awards vested, weighted average grant date fair value (in USD per share)					22.55
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 22.55
LTIP Plan | 2019 | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			425,600		425,600
Awards granted (in shares)					0
Awards vested (in shares)					0
Awards forfeited/canceled (in shares)					(112,100)
Outstanding, end of period (in shares)				313,500	313,500	313,500
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 22.55	$ 22.55	$ 22.55	22.55
Awards granted, weighted average grant date fair value (in USD per share)					0
Awards vested, weighted average grant date fair value (in USD per share)					0
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 22.55
LTIP Plan | 2018 | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			241,900		241,900
Awards granted (in shares)					0
Awards vested (in shares)					(108,500)
Awards forfeited/canceled (in shares)					(49,000.0)
Outstanding, end of period (in shares)				84,400	84,400	84,400
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 19.43	$ 19.43	$ 19.43	19.00
Awards granted, weighted average grant date fair value (in USD per share)					0
Awards vested, weighted average grant date fair value (in USD per share)					19.32
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 17.56
LTIP Plan | 2018 | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			364,700		364,700
Awards granted (in shares)					0
Awards vested (in shares)					0
Awards forfeited/canceled (in shares)					(110,000.0)
Outstanding, end of period (in shares)				254,700	254,700	254,700
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 19.45	$ 19.45	$ 19.45	19.00
Awards granted, weighted average grant date fair value (in USD per share)					0
Awards vested, weighted average grant date fair value (in USD per share)					0
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 17.97
LTIP Plan | 2017 | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			54,000.0		54,000.0
Awards granted (in shares)					0
Awards vested (in shares)					(53,400)
Awards forfeited/canceled (in shares)					(600)
Outstanding, end of period (in shares)				0	0	0
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 0	$ 0	$ 0	19.70
Awards granted, weighted average grant date fair value (in USD per share)					0
Awards vested, weighted average grant date fair value (in USD per share)					19.70
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 19.70
LTIP Plan | 2017 | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			110,900		110,900
Awards granted (in shares)					0
Awards vested (in shares)					(14,200)
Awards forfeited/canceled (in shares)					(96,700)
Outstanding, end of period (in shares)				0	0	0
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)				$ 0	$ 0	$ 0	$ 19.70
Awards granted, weighted average grant date fair value (in USD per share)					0
Awards vested, weighted average grant date fair value (in USD per share)					19.70
Awards forfeited/canceled, weighted average grant date fair value (in USD per share)					$ 19.70
LTIP Plan | 2017 | Time-based and Performance-based RSU Awards
Weighted Average Grant Date Fair Value Per RSU
Vesting period					2 years
Total LTIP and TIP RSU's | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			922,100		922,100
Outstanding, end of period (in shares)				1,067,600	1,067,600	1,067,600
Total LTIP and TIP RSU's | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)			901,200		901,200
Outstanding, end of period (in shares)				1,194,900	1,194,900	1,194,900
Revlon 2019 Transaction Incentive Program, Tier 1 | Restricted Stock
Restricted Stock Units
Outstanding, end of period (in shares)				148,168	148,168	148,168
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)					27,356	27,356