Basic and Diluted (Loss) Earnings Per Common Share - Components of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Income (loss) from continuing operations	$ 8.7	$ (4.5)
Loss from discontinued operations	(3.2)	(2.4)
Net income (loss)	$ 5.5	$ (6.9)
Denominator:
Weighted average common shares outstanding - Basic (shares)	52,356,798	52,356,798
Effect of dilutive restricted stock (shares)	11,146	0
Weighted average common shares outstanding - Diluted (shares)	52,367,944	52,356,798
Basic earnings (loss) per common share:
Continuing operations (usd per share)	$ 0.17	$ (0.08)
Discontinued operations (usd per share)	$ (0.06)	$ (0.05)
Basic earnings per share (usd per share)	$ 0.11	$ (0.13)
Diluted earnings (loss) per common share:
Continuing operations (usd per share)	$ 0.17	$ (0.08)
Discontinued operations (usd per share)	$ (0.06)	$ (0.05)
Diluted earnings per share (usd per share)	$ 0.11	$ (0.13)