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						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Loss from continuing operations, net of taxes	$ (44.5)			$ (44.4)			$ (385.2)	$ (185.5)
(Loss) income from discontinued operations, net of taxes	0.0			(0.3)			0.0	2.0
Net (loss) income	$ (44.5)	$ (126.8)	$ (213.9)	$ (44.7)	$ (63.7)	$ (75.1)	$ (385.2)	$ (183.5)
Denominator:
Weighted average common shares outstanding - Basic (in shares)	53,476,354			53,129,004			53,371,986	53,057,154
Effect of dilutive restricted stock (in shares)	0			0			0	0
Weighted average common shares outstanding - Diluted (in shares)	53,476,354			53,129,004			53,371,986	53,057,154
Basic and Diluted (loss) earnings per common share:
Continuing operations (in dollars per share)	$ (0.83)			$ (0.84)			$ (7.22)	$ (3.50)
Discontinued operations (in dollars per share)	0			0			0	0.04
Net loss (in dollars per share)	$ (0.83)			$ (0.84)			$ (7.22)	$ (3.46)
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			314,478			0	406,854