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, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Loss from continuing operations, net of taxes	$ (126.8)		$ (65.3)		$ (340.7)	$ (141.1)
Income from discontinued operations, net of taxes	0.0		1.6		0.0	2.3
Net (loss) income	$ (126.8)	$ (213.9)	$ (63.7)	$ (75.1)	$ (340.7)	$ (138.8)
Denominator:
Weighted average common shares outstanding - Basic (in shares)	53,471,004		53,126,700		53,319,228	53,020,633
Effect of dilutive restricted stock (in shares)	0		0		0	0
Weighted average common shares outstanding - Diluted (in shares)	53,471,004		53,126,700		53,319,228	53,020,633
Basic and Diluted (loss) earnings per common share:
Continuing operations (in dollars per share)	$ (2.37)		$ (1.23)		$ (6.39)	$ (2.66)
Discontinued operations (in dollars per share)	0		0.03		0	0.04
Net loss (in dollars per share)	$ (2.37)		$ (1.20)		$ (6.39)	$ (2.62)
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		304,608		56,058	445,525