Earnings Per Common Share - Computation of EPS (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share Reconciliation [Abstract]
Net income	$ 17.6	$ 14.5	$ 49.0	$ 46.9
Preferred stock dividends	2.6	2.6	7.8	7.8
Net income applicable to common shareowners	15.0	11.9	41.2	39.1
Net income applicable to common shareowners, diluted	$ 15.0	$ 11.9	$ 41.2	$ 39.1
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average common shares outstanding - basic	196.5	201.2	197.4	201.0
Warrants	1.2	0	0.5	0.9
Stock-based compensation arrangements	2.9	3.0	2.5	3.0
Weighted average common shares outstanding - diluted	200.6	204.2	200.4	204.9
Basic earnings per common share	$ 0.08	$ 0.06	$ 0.21	$ 0.19
Diluted earnings per common share	$ 0.07	$ 0.06	$ 0.21	$ 0.19

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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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