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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
(Loss) income from continuing operations, net of taxes	$ (32.8)	$ (4.5)	$ (107.6)	$ 16.9
Income (loss) from discontinued operations, net of taxes	0.4	(0.2)	1.3	(2.3)
Net (loss) income	$ (32.4)	$ (4.7)	$ (106.3)	$ 14.6
Denominator:
Weighted average common shares outstanding - Basic (shares)	52,615,412	52,498,246	52,584,954	52,498,840
Effect of dilutive restricted stock (shares)	0	0	0	118,900
Weighted average common shares outstanding - Diluted (shares)	52,615,412	52,498,246	52,584,954	52,617,740
Basic (loss) earnings per common share:
Continuing operations (usd per share)	$ (0.62)	$ (0.09)	$ (2.04)	$ 0.32
Discontinued operations (usd per share)	0.01	0.00	0.02	(0.04)
Net (loss) income (usd per share)	(0.61)	(0.09)	(2.02)	0.28
Diluted (loss) earnings per common share:
Continuing operations (usd per share)	(0.62)	(0.09)	(2.04)	0.32
Discontinued operations (usd per share)	0.01	0.00	0.02	(0.04)
Net (loss) income (usd per share)	$ (0.61)	$ (0.09)	$ (2.02)	$ 0.28
Restricted Stock
Diluted (loss) earnings per common share:
Unvested restricted stock awards under the Stock Plan (shares)	19,506	0	19,486	0