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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2014
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)
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
Net income (loss)
$
75.6

 
$
(54.7
)
 
$
11.2

Preferred stock dividends
10.4

 
10.4

 
10.4

Net income (loss) applicable to common shareowners - basic and diluted
$
65.2

 
$
(65.1
)
 
$
0.8

Denominator:
 
 
 
 
 
Weighted-average common shares outstanding - basic
208.5

 
205.9

 
197.0

Warrants
—

 
—

 
4.5

Stock-based compensation arrangements
1.1

 
—

 
3.2

Weighted-average common shares outstanding - diluted
209.6

 
205.9

 
204.7

Basic and diluted earnings (loss) per common share
$
0.31

 
$
(0.32
)
 
$
0.00