(Loss) Earnings per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Net loss	$ (12.0)	$ (12.5)	$ (24.2)	$ (19.7)
Weighted average number of common shares outstanding during period	37.7	37.8	37.6	37.9
Dilutive effect of stock-based compensation plans (in shares)	0	0	0	0
Weighted average number of diluted shares outstanding during the period	37.7	37.8	37.6	37.9
(Loss) earnings per common share - basic (dollars per share)	$ (0.32)	$ (0.33)	$ (0.64)	$ (0.52)
(Loss) earnings per common share - diluted (dollars per share)	$ (0.32)	$ (0.33)	$ (0.64)	$ (0.52)
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options excluded from calculation (in shares)	6.4	5.3	6.2	4.4