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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
(in millions, except per share amounts)
2018
 
2017
Numerator:
 
 
 
Net (loss) income
$
(8.3
)
 
$
60.6

Preferred stock dividends
2.6

 
2.6

Net (loss) income applicable to common shareowners - basic and diluted
$
(10.9
)
 
$
58.0

Denominator:
 
 
 
Weighted average common shares outstanding - basic
42.3

 
42.1

Stock-based compensation arrangements
—

 
0.2

Weighted average common shares outstanding - diluted
42.3

 
42.3

Basic net (loss) earnings per common share
$
(0.26
)
 
$
1.38

Diluted net (loss) earnings per common share
$
(0.26
)
 
$
1.37