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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
(in millions, except per share amounts)
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
4.5

 
$
13.5

 
$
17.1

 
$
31.4

Preferred stock dividends
2.6

 
2.6

 
5.2

 
5.2

Income available to common shareholders - basic and diluted
$
1.9

 
$
10.9

 
$
11.9

 
$
26.2

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
195.8

 
198.0

 
195.5

 
197.9

Warrants
3.1

 
0.2

 
3.1

 
0.1

Stock-based compensation arrangements
2.8

 
2.8

 
3.1

 
2.7

Weighted average common shares outstanding - diluted
201.7

 
201.0

 
201.7

 
200.7

Basic earnings per common share
$
0.01

 
$
0.06

 
$
0.06

 
$
0.13

Diluted earnings per common share
$
0.01

 
$
0.05

 
$
0.06

 
$
0.13