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Quarterly Results of Operations (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations (unaudited) [Table Text Block]
 
 
2016
 
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
 
(millions, except per-share amounts)
Net sales
 
$
880.7

 
$
1,043.8

 
$
1,067.2

 
$
919.5

Income (loss) from operations
 
$
13.4

 
$
37.9

 
$
31.3

 
$
(3.0
)
Net income
 
$
5.0

 
$
19.2

 
$
10.0

 
$
4.1

Net income per common share – Basic
 
$
0.13

 
$
0.50

 
$
0.26

 
$
0.11

Net income per common share – Diluted
 
$
0.13

 
$
0.49

 
$
0.26

 
$
0.11


 
 
2015
 
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
 
(millions, except per-share amounts)
Net sales
 
$
809.9

 
$
955.4

 
$
991.6

 
$
876.5

Income from operations
 
$
17.7

 
$
37.4

 
$
40.4

 
$
7.7

Net income
 
$
7.6

 
$
20.2

 
$
22.0

 
$
2.3

Net income per common share – Basic and Diluted
 
$
0.19

 
$
0.51

 
$
0.56

 
$
0.06