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Investments (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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