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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 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:
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions, except per share amounts)
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
3.9

 
$
17.6

 
$
21.0

 
$
49.0

Preferred stock dividends
2.6

 
2.6

 
7.8

 
7.8

Income available to common shareholders - basic and diluted
$
1.3

 
$
15.0

 
$
13.2

 
$
41.2

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
196.4

 
196.5

 
195.8

 
197.4

Warrants
5.6

 
1.2

 
3.9

 
0.5

Stock-based compensation arrangements
3.6

 
2.9

 
3.3

 
2.5

Weighted average common shares outstanding - diluted
205.6

 
200.6

 
203.0

 
200.4

Basic earnings per common share
$
0.01

 
$
0.08

 
$
0.07

 
$
0.21

Diluted earnings per common share
$
0.01

 
$
0.07

 
$
0.07

 
$
0.21