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
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss	$ (96.0)	$ (213.9)
Denominator:
Weighted-average common shares outstanding - Basic (in shares)	53,653,449	53,167,453
Effect of dilutive restricted stock and RSUs (in shares)	0	0
Weighted-average common shares outstanding - Diluted (in shares)	53,653,449	53,167,453
Basic and Diluted (loss) earnings per common share:
Net loss (in dollars per share)	$ (1.79)	$ (4.02)
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)	376,812	300,787