REVLON, INC. BASIC AND DILUTED EARNINGS (LOSS) PER COMMON SHARE - Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (67.7)	$ (96.0)	$ (126.8)	$ (213.9)	$ (163.7)	$ (340.7)
Denominator:
Weighted-average common shares outstanding - Basic (in shares)	54,015,794		53,471,004		53,835,622	53,319,228
Effect of dilutive restricted stock and RSUs (in shares)	0		0		0	0
Weighted-average common shares outstanding - Diluted (in shares)	54,015,794		53,471,004		53,835,622	53,319,228
Basic and Diluted (loss) earnings per common share:
Basic net loss per common share (in dollars per share)	$ (1.25)		$ (2.37)		$ (3.04)	$ (6.39)
Diluted net loss per common share (in dollars per share)	$ (1.25)		$ (2.37)		$ (3.04)	$ (6.39)
Restricted Stock and Restricted Stock Units
Basic and Diluted (loss) earnings per common share:
Unvested restricted stock and RSUs under the Stock Plan (in shares)	667,978		0		504,499	56,058