(Loss) Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
(Loss) Earnings Per Share
Net (loss) income	$ (1.8)	$ 8.5	$ (83.4)	$ 21.9
Preferred stock dividends	(1.0)		(2.6)
Net (loss) income less preferred stock dividends	(2.8)	8.5	(86.0)	21.9
Net (loss) income available to common stockholders	$ (2.8)	$ 8.5	$ (86.0)	$ 21.9
Basic weighted average number of common shares outstanding	74.5	46.2	70.8	46.1
Assuming exercise of stock options and restricted shares		0.3		0.2
Diluted weighted average number of common shares outstanding	74.5	46.5	70.8	46.3
(Loss) earnings per share:
Basic (in dollars per share)	$ (0.04)	$ 0.18	$ (1.21)	$ 0.48
Diluted (in dollars per share)	$ (0.04)	$ 0.18	$ (1.21)	$ 0.47
Securities excluded in the computation of diluted income per share (in shares)	7.2	4.4	7.7	4.7