STOCK COMPENSATION PLAN - Activity Related to Time-based and Performance-based RSUs and the Grant Date Fair Value (Details) - $ / shares	12 Months Ended		16 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020
Restricted Stock Units
Restricted Stock Units
Awards granted (in shares)	1,065,319	1,096,324
TIP Plan | 2019 | TIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	200,600
Awards granted (in shares)	11,700
Awards vested (in shares)	(97,700)
Awards forfeited/canceled (in shares)	(55,800)
Outstanding, end of period (in shares)	58,800	200,600	58,800
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 15.95	$ 16.44	$ 15.95
Awards granted, weighted average grant date fair value (in dollars per share)	10.24
Awards vested, weighted average grant date fair value (in dollars per share)	16.12
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 16.44
LTIP Plan | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	721,500
Awards granted (in shares)	577,300
Awards vested (in shares)	(308,900)
Awards forfeited/canceled (in shares)	(257,700)
Outstanding, end of period (in shares)	732,200	721,500	732,200
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
Awards granted (in shares)	476,300
Awards vested (in shares)	(14,200)
Awards forfeited/canceled (in shares)	(429,200)
Outstanding, end of period (in shares)	934,100	901,200	934,100
Weighted Average Grant Date Fair Value Per RSU
Vesting period	3 years
LTIP Plan | Restricted Stock Units
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)	44,182		49,642
LTIP Plan | 2020 | Time-Based LTIP
Restricted Stock Units
Awards granted (in shares)	577,300
Awards forfeited/canceled (in shares)	(80,800)
Outstanding, end of period (in shares)	496,500		496,500
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 14.96		$ 14.96
Awards granted, weighted average grant date fair value (in dollars per share)	14.96
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 14.96
LTIP Plan | 2020 | Performance-Based LTIP
Restricted Stock Units
Awards granted (in shares)	476,300
Awards forfeited/canceled (in shares)	(13,400)
Outstanding, end of period (in shares)	462,900		462,900
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 14.96		$ 14.96
Awards granted, weighted average grant date fair value (in dollars per share)	14.96
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 14.96
LTIP Plan | 2020 | Restricted Stock Units
Restricted Stock Units
Awards granted (in shares)	1,100,000
LTIP Plan | 2019 | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	425,600
Awards granted (in shares)	0
Awards vested (in shares)	(141,800)
Awards forfeited/canceled (in shares)	(114,500)
Outstanding, end of period (in shares)	169,300	425,600	169,300
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 22.55	$ 22.55	$ 22.55
Awards granted, weighted average grant date fair value (in dollars per share)	0
Awards vested, weighted average grant date fair value (in dollars per share)	22.55
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 22.55
LTIP Plan | 2019 | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	425,600
Awards granted (in shares)	0
Awards vested (in shares)	0
Awards forfeited/canceled (in shares)	(170,300)
Outstanding, end of period (in shares)	255,300	425,600	255,300
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 22.55	$ 22.55	$ 22.55
Awards granted, weighted average grant date fair value (in dollars per share)	0
Awards vested, weighted average grant date fair value (in dollars per share)	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 22.55
LTIP Plan | 2018 | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	241,900
Awards granted (in shares)	0
Awards vested (in shares)	(113,700)
Awards forfeited/canceled (in shares)	(61,800)
Outstanding, end of period (in shares)	66,400	241,900	66,400
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 19.40	$ 19.00	$ 19.40
Awards granted, weighted average grant date fair value (in dollars per share)	0
Awards vested, weighted average grant date fair value (in dollars per share)	19.32
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 17.98
LTIP Plan | 2018 | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	364,700
Awards granted (in shares)	0
Awards vested (in shares)	0
Awards forfeited/canceled (in shares)	(148,800)
Outstanding, end of period (in shares)	215,900	364,700	215,900
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 19.42	$ 19.00	$ 19.42
Awards granted, weighted average grant date fair value (in dollars per share)	0
Awards vested, weighted average grant date fair value (in dollars per share)	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 18.44
LTIP Plan | 2017 | Time-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	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	54,000.0	0
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 0	$ 19.70	$ 0
Awards granted, weighted average grant date fair value (in dollars per share)	0
Awards vested, weighted average grant date fair value (in dollars per share)	19.70
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 19.70
LTIP Plan | 2017 | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	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	110,900	0
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in dollars per share)	$ 0	$ 19.70	$ 0
Awards granted, weighted average grant date fair value (in dollars per share)	0
Awards vested, weighted average grant date fair value (in dollars per share)	19.70
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	$ 19.70
LTIP Plan | 2017 | Restricted Stock Units
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
Outstanding, end of period (in shares)	791,000.0	922,100	791,000.0
Total LTIP and TIP RSU's | Performance-Based LTIP
Restricted Stock Units
Outstanding, beginning of period (in shares)	901,200
Outstanding, end of period (in shares)	934,100	901,200	934,100
Revlon 2019 Transaction Incentive Program, Tier 1 | Time-Based LTIP
Restricted Stock Units
Outstanding, end of period (in shares)	58,773		58,773
Revlon 2019 Transaction Incentive Program, Tier 1 | Restricted Stock Units
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)	41,203		41,203