(Loss) Earnings per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Loss from continuing operations	$ (15.6)	$ (9.2)
Loss from operations of discontinued business, net of income taxes	(5.5)	(3.0)
Net loss	$ (21.1)	$ (12.2)
Weighted average number of common shares outstanding during period	40.4	37.5
Dilutive effect of stock-based compensation plans (in shares)	0	0
Weighted average number of diluted shares outstanding during the period	40.4	37.5
(Loss) earnings per common share - basic (dollars per share)	$ (0.52)	$ (0.33)
(Loss) earnings per common share — basic
Continuing operations	$ (0.39)	$ (0.25)
Discontinued operations	$ (0.14)	$ (0.08)
(Loss) earnings per common share — diluted
Continuing operations	$ (0.39)	$ (0.25)
Discontinued operations	$ (0.14)	$ (0.08)
Net loss - diluted (dollars per share)	$ (0.52)	$ (0.33)
Anti-dilutive shares excluded from calculation (in shares)	6.5	5.9