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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
(Loss) income from continuing operations, net of taxes	$ (37.1)	$ 10.8	$ (74.8)	$ 21.4
Income from discontinued operations, net of taxes	0.6	(2.5)	0.9	(2.1)
Net (loss) income	$ (36.5)	$ 8.3	$ (73.9)	$ 19.3
Denominator:
Weighted average common shares outstanding - Basic (shares)	53,096,935	52,515,869	52,569,473	52,499,141
Effect of dilutive restricted stock (shares)	0	76,499	0	121,925
Weighted average common shares outstanding - Diluted (shares)	53,096,935	52,592,368	52,569,473	52,621,066
Basic (loss) earnings per common share:
Continuing operations (usd per share)	$ (0.70)	$ 0.21	$ (1.42)	$ 0.41
Discontinued operations (usd per share)	0.00	(0.05)	0.01	(0.04)
Net (loss) income (usd per share)	(0.70)	0.16	(1.41)	0.37
Diluted (loss) earnings per common share:
Continuing operations (usd per share)	(0.70)	0.21	(1.42)	0.41
Discontinued operations (usd per share)	0.00	(0.05)	0.01	(0.04)
Net (loss) income (usd per share)	$ (0.70)	$ 0.16	$ (1.41)	$ 0.37
Restricted Stock
Diluted (loss) earnings per common share:
Unvested restricted stock awards under the Stock Plan	0	0	43,120	0