BASIC AND DILUTED EARNINGS 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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Loss from continuing operations, net of taxes	$ (65.3)		$ (121.4)		$ (141.1)	$ (213.1)
Income (loss) from discontinued operations, net of taxes	1.6		(1.1)		2.3	0.3
Net (loss) income	$ (63.7)	$ (75.1)	$ (122.5)	$ (90.3)	$ (138.8)	$ (212.8)
Denominator:
Weighted average common shares outstanding - Basic (shares)	53,126,700		52,823,326		53,020,633	52,748,913
Effect of dilutive restricted stock (shares)	0		0		0	0
Weighted average common shares outstanding - Diluted (shares)	53,126,700		52,823,326		53,020,633	52,748,913
Basic loss per common share:
Continuing operations (usd per share)	$ (1.23)		$ (2.30)		$ (2.66)	$ (4.04)
Discontinued operations (usd per share)	0.03		(0.02)		0.04	0.01
Net loss (usd per share)	(1.20)		(2.32)		(2.62)	(4.03)
Diluted loss per common share:
Continuing operations (usd per share)	(1.23)		(2.30)		(2.66)	(4.04)
Discontinued operations (usd per share)	0.03		(0.02)		0.04	0.01
Net loss (usd per share)	$ (1.20)		$ (2.32)		$ (2.62)	$ (4.03)
Restricted Stock and Restricted Stock Units
Diluted loss per common share:
Unvested restricted stock and RSUs under the Stock Plan (in shares)	304,608		10,733		445,525	53,981