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Investments (Tables)
 12 Months Ended
Dec. 31, 2014
Investments [Abstract]  
Unrealized Gain (Loss) on Investments [Table Text Block]
The following table summarizes unrealized gains and losses related to these investments as of December 31, 2014 and December 31, 2013:
Dollar amounts in millions
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
December 31, 2014
 
 
 
 
 
 
 
Auction rate securities
$
0.3

 
$
4.3

 
$
—

 
$
4.6

 
 
 
 
 
 
 
 
Total marketable securities
$
0.3

 
$
4.3

 
$
—

 
$
4.6

 
 
 
 
 
 
 
 
December 31, 2013
 
 
 
 
 
 
 
Auction rate securities
$
0.4

 
$
3.3

 
$
—

 
$
3.7

 
 
 
 
 
 
 
 
Total marketable securities
$
0.4

 
$
3.3

 
$
—

 
$
3.7
Investments Classified by Contractual Maturity Date [Table Text Block]
The contractual maturities of debt securities classified as available for sale at December 31, 2014 were as follows: 
Dollar amounts in millions
2014
Amortized
Cost
 
Fair
Value
Due in one year or less
$
—

 
$
—

Due in more than one year
0.3

 
4.6

Total marketable securities
$
0.3

 
$
4.6