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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
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)
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net (loss) income
$
(13.8
)
 
$
2.3

 
$
(22.1
)
 
$
62.9

Preferred stock dividends
2.6

 
2.6

 
5.2

 
5.2

Net (loss) income applicable to common shareowners - basic and diluted
$
(16.4
)
 
$
(0.3
)
 
$
(27.3
)
 
$
57.7

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
42.4

 
42.2

 
42.4

 
42.1

Stock-based compensation arrangements
—

 
—

 
—

 
0.2

Weighted average common shares outstanding - diluted
42.4

 
42.2

 
42.4

 
42.3

Basic net (loss) earnings per common share
$
(0.39
)
 
$
(0.01
)
 
$
(0.64
)
 
$
1.37

Diluted net (loss) earnings per common share
$
(0.39
)
 
$
(0.01
)
 
$
(0.64
)
 
$
1.36