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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
The following table shows the computation of basic and diluted EPS:
 
Year Ended December 31,
(in millions, except per share amounts)
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
Net income
$
11.2

 
$
18.6

 
$
28.3

Preferred stock dividends
10.4

 
10.4

 
10.4

Income applicable to common shareowners - basic and diluted
$
0.8

 
$
8.2

 
$
17.9

Denominator:
 
 
 
 
 
Weighted-average common shares outstanding - basic
197.0

 
196.8

 
201.0

Warrants
4.5

 
0.4

 
0.6

Stock-based compensation arrangements
3.2

 
2.8

 
2.4

Weighted-average common shares outstanding - diluted
204.7

 
200.0

 
204.0

Basic earnings per common share
$
0.00

 
$
0.04

 
$
0.09

Diluted earnings per common share
$
0.00

 
$
0.04

 
$
0.09