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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
(Loss) Income from continuing operations, net of taxes	$ (4.5)	$ 7.9	$ 16.9	$ 33.1
Loss from discontinued operations, net of taxes	(0.2)	(1.7)	(2.3)	(1.8)
Net (loss) income	$ (4.7)	$ 6.2	$ 14.6	$ 31.3	[1]
Denominator:
Weighted average common shares outstanding - Basic (shares)	52,498,246	52,440,580	52,498,840	52,422,660
Effect of dilutive restricted stock (shares)	0	163,131	118,900	170,547
Weighted average common shares outstanding - Diluted (shares)	52,498,246	52,603,711	52,617,740	52,593,207
Basic (loss) earnings per common share:
Continuing operations (usd per share)	$ (0.09)	$ 0.15	$ 0.32	$ 0.63
Discontinued operations (usd per share)	0.00	(0.03)	(0.04)	(0.03)
Net income (usd per share)	(0.09)	0.12	0.28	0.60
Diluted (loss) earnings per common share:
Continuing operations (usd per share)	(0.09)	0.15	0.32	0.63
Discontinued operations (usd per share)	0.00	(0.03)	(0.04)	(0.03)
Net income (usd per share)	$ (0.09)	$ 0.12	$ 0.28	$ 0.60

[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2016. See Note 1, "Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements" for details of these adjustments.