STOCK COMPENSATION PLAN - Awards Granted, Forfeited and Outstanding (Details) - $ / shares		3 Months Ended	8 Months Ended	9 Months Ended
	Aug. 31, 2019	Mar. 31, 2020	Mar. 31, 2020	Sep. 30, 2019	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
Awards granted (in shares)		0
Awards vested (in shares)		(21,100)
Awards forfeited (in shares)		(25,800)
Outstanding, end of period (in shares)		153,700	153,700
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 16.44	$ 16.44		$ 16.44
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)		16.44
Awards forfeited, 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
Awards granted (in shares)		648,400
Awards vested (in shares)		(286,500)
Awards forfeited (in shares)		(113,400)
Outstanding, end of period (in shares)		970,000.0	970,000.0
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)		648,400
Awards vested (in shares)		(14,200)
Awards forfeited (in shares)		(261,500)
Outstanding, end of period (in shares)		1,273,900	1,273,900
Weighted Average Grant Date Fair Value Per RSU
Vesting period		3 years
LTIP Plan | Time-based and Performance-based RSU Awards
Restricted Stock Units
Awards granted (in shares)		1,300,000
LTIP Plan | Restricted Stock
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)		23,888	29,350
LTIP Plan | 2020 | Time-Based LTIP
Restricted Stock Units
Awards granted (in shares)		648,400
Outstanding, end of period (in shares)		648,400	648,400
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 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)		648,400
Outstanding, end of period (in shares)		648,400	648,400
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 14.96	$ 14.96
Awards granted, weighted average grant date fair value (in USD per share)		$ 14.96
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)		(129,300)
Awards forfeited (in shares)		(68,400)
Outstanding, end of period (in shares)		227,900	227,900
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
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, 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
Awards granted (in shares)		0
Awards vested (in shares)		0
Awards forfeited (in shares)		(82,800)
Outstanding, end of period (in shares)		342,800	342,800
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
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, 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
Awards granted (in shares)		0
Awards vested (in shares)		(103,800)
Awards forfeited (in shares)		(44,400)
Outstanding, end of period (in shares)		93,700	93,700
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 19.45	$ 19.45		19.00
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)		19.30
Awards forfeited, weighted average grant date fair value (in USD per share)		$ 17.33
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 (in shares)		(82,000.0)
Outstanding, end of period (in shares)		282,700	282,700
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 19.46	$ 19.46		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, weighted average grant date fair value (in USD per share)		$ 17.44
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 (in shares)		(600)
Outstanding, end of period (in shares)		0	0
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 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, 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
Awards granted (in shares)		0
Awards vested (in shares)		(14,200)
Awards forfeited (in shares)		(96,700)
Outstanding, end of period (in shares)		0	0
Weighted Average Grant Date Fair Value Per RSU
Awards outstanding, weighted average grant date fair value (in USD per share)		$ 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, 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
Outstanding, end of period (in shares)		1,123,700	1,123,700
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)		1,273,900	1,273,900
Revlon 2019 Transaction Incentive Program, Tier 1 | Restricted Stock
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)		21,077	21,077