Net Earnings (Loss) Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings (loss) per share:
Net (loss) income	$ (4.9)	$ 0.4
Preferred stock dividends	(1.0)	(1.0)
Net income less preferred stock dividends	$ (5.9)	$ (0.6)
Basic weighted average number of common shares outstanding	72.4	75.0
Diluted weighted average number of common shares outstanding	72.4	75.0
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.08)	$ (0.01)
Diluted (in dollars per share)	$ (0.08)	$ (0.01)
Number of options and non-vested restricted stock awards assumed to be repurchased under the treasury stock method	2.8	2.9
Convertible Preferred Stock
Earnings (loss) per share:
Securities excluded in the computation of diluted income per share (in shares)	3.1	3.1