(Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings per share:
Net (loss) income	$ (2.2)	$ 8.6
Preferred stock dividends	(1.0)	(1.0)
Net (loss) income less preferred stock dividends	(3.2)	7.6
Income allocated to participating securities		(0.3)
Net (loss) income available to common stockholders	$ (3.2)	$ 7.3
Basic weighted average number of common shares outstanding	61.7	64.9
Assuming exercise of stock options and restricted shares		0.2
Diluted weighted average number of common shares outstanding	61.7	65.1
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.05)	$ 0.11
Diluted (in dollars per share)	$ (0.05)	$ 0.11
Number of options and non-vested restricted stock awards assumed to be repurchased under the treasury stock method		2.6
Convertible Preferred Stock
Earnings (loss) per share:
Securities excluded in the computation of diluted income per share (in shares)	3.1	3.1