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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions, except per share amounts)
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net (loss) income
$
(17.7
)
 
$
(11.0
)
 
$
(39.8
)
 
$
51.9

Preferred stock dividends
2.6

 
2.6

 
7.8

 
7.8

Net (loss) income applicable to common shareowners - basic and diluted
$
(20.3
)
 
$
(13.6
)
 
$
(47.6
)
 
$
44.1

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
50.1

 
42.2

 
45.0

 
42.1

Stock-based compensation arrangements
—

 
—

 
—

 
0.2

Weighted average common shares outstanding - diluted
50.1

 
42.2

 
45.0

 
42.3

Basic net (loss) earnings per common share
$
(0.41
)
 
$
(0.32
)
 
$
(1.06
)
 
$
1.05

Diluted net (loss) earnings per common share
$
(0.41
)
 
$
(0.32
)
 
$
(1.06
)
 
$
1.04