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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
2013
 
First
 
Second
 
Third
 
Fourth
 
 
(dollars in millions, except per common share amounts)
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Total
Revenue
$
325.7

 
$
312.0

 
$
310.8

 
$
308.4

 
$
1,256.9

Operating income
19.2

 
46.8

 
57.7

 
40.1

 
163.8

Net (loss) income
(36.7
)
 
0.8

 
9.3

 
(28.1
)
 
(54.7
)
Basic and diluted (loss) earnings per common share
$
(0.19
)
 
$
(0.01
)
 
$
0.03

 
$
(0.15
)
 
$
(0.32
)
 
 
 
 
 
 
 
 
 
 
 
2012
 
First
 
Second
 
Third
 
Fourth
 
 
(dollars in millions, except per common share amounts)
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Total
Revenue
$
362.8

 
$
368.2

 
$
368.2

 
$
374.7

 
$
1,473.9

Operating income
81.0

 
65.2

 
66.0

 
57.9

 
270.1

Net income (loss)
12.6

 
4.5

 
3.9

 
(9.8
)
 
11.2

Basic and diluted earnings (loss) per common share
$
0.05

 
$
0.01

 
$
0.01

 
$
(0.06
)
 
$
0.00