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						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Loss from continuing operations, net of taxes	$ (44.4)			$ (10.7)			$ (185.5)	$ (223.8)
(Loss) income from discontinued operations, net of taxes	(0.3)			(0.4)			2.0	(0.1)
Net (loss) income	$ (44.7)	$ (63.7)	$ (75.1)	$ (11.1)	$ (122.5)	$ (90.3)	$ (183.5)	$ (223.9)
Denominator:
Weighted average common shares outstanding - Basic (shares)	53,129,004			52,834,879			53,057,154	52,777,883
Effect of dilutive restricted stock (shares)	0			0			0	0
Weighted average common shares outstanding - Diluted (shares)	53,129,004			52,834,879			53,057,154	52,777,883
Basic loss per common share:
Continuing operations (usd per share)	$ (0.84)			$ (0.20)			$ (3.50)	$ (4.24)
Discontinued operations (usd per share)	0.00			(0.01)			0.04	0.00
Net loss (usd per share)	(0.84)			(0.21)			(3.46)	(4.24)
Diluted loss per common share:
Continuing operations (usd per share)	(0.84)			(0.20)			(3.50)	(4.24)
Discontinued operations (usd per share)	0.00			(0.01)			0.04	0.00
Net loss (usd per share)	$ (0.84)			$ (0.21)			$ (3.46)	$ (4.24)
Restricted Stock and Restricted Stock Units
Diluted loss per common share:
Unvested restricted stock and RSUs under the Stock Plan (in shares)	314,478			197,667			406,854	165,961