(Loss) Earnings per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Loss from continuing operations	$ (1.8)	$ (9.5)	$ (17.4)	$ (18.7)
Loss from operations of discontinued business, net of income taxes	(3.3)	(2.5)	(8.8)	(5.5)
Net loss	$ (5.1)	$ (12.0)	$ (26.2)	$ (24.2)
Weighted average number of common shares outstanding during period	40.5	37.7	40.5	37.6
Dilutive effect of stock-based compensation plans (in shares)	0	0	0	0
Weighted average number of diluted shares outstanding during the period	40.5	37.7	40.5	37.6
(Loss) earnings per common share — basic
Continuing operations	$ (0.04)	$ (0.25)	$ (0.43)	$ (0.50)
Discontinued operations	$ (0.08)	$ (0.07)	$ (0.22)	$ (0.15)
Net loss - basic (dollars per share)	$ (0.13)	$ (0.32)	$ (0.65)	$ (0.64)
(Loss) earnings per common share — diluted
Continuing operations	$ (0.04)	$ (0.25)	$ (0.43)	$ (0.50)
Discontinued operations	$ (0.08)	$ (0.07)	$ (0.22)	$ (0.15)
Net loss - diluted (dollars per share)	$ (0.13)	$ (0.32)	$ (0.65)	$ (0.64)
Anti-dilutive shares excluded from calculation (in shares)	6.2	6.4	6.5	6.2