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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Loss from continuing operations, net of taxes	$ (619.0)	$ (165.2)
Income from discontinued operations, net of taxes	0.0	7.5
Net (loss) income	$ (619.0)	$ (157.7)
Denominator:
Weighted-average common shares outstanding - Basic (in shares)	53,401,324	53,081,321
Effect of dilutive restricted stock and RSUs (in shares)	0	0
Weighted-average common shares outstanding - Diluted (in shares)	53,401,324	53,081,321
Basic and Diluted (loss) earnings per common share:
Continuing operations (in dollars per share)	$ (11.59)	$ (3.11)
Discontinued operations (in dollars per share)	0	0.14
Net loss (in dollars per share)	$ (11.59)	$ (2.97)
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)	0	478,202