Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net (loss) income	$ (36.7)	$ 12.6
Preferred stock dividends	2.6	2.6
Net Income (Loss) Available to Common Stockholders, Diluted	$ (39.3)	$ 10.0
Denominator:
Weighted average common shares outstanding - basic	202.8	195.3
Warrants	0	3.1
Stock-based compensation arrangements	0	3.2
Weighted average common shares outstanding - diluted	202.8	201.6
Basic and diluted (loss) earnings per common share	$ (0.19)	$ 0.05
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		7.0
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		4.5

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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