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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2016
Income Tax Disclosure [Abstract] |
Schedule of Current and Deferred Tax Assets Table [Table Text Block] | Current and Deferred Income Tax Assets at September 30, 2016 and December 31, 2015 were:
(Dollars in Millions) |  | Sep 30, 2016 |  | Dec 31, 2015
Current Income Tax Assets |  | $ | 28.5 |  |  | $ | 9.5 |
Deferred Income Tax Assets |  | — |  |  | 31.9 |
Current and Deferred Income Tax Assets |  | $ | 28.5 |  |  | $ | 41.4 |
Schedule of Components of Income Tax Liabilities [Table Text Block] | The components of Liabilities for Income Taxes at September 30, 2016 and December 31, 2015 were:
(Dollars in Millions) |  | Sep 30, 2016 |  | Dec 31, 2015
Deferred Income Tax Liabilities |  | $ | 29.5 |  |  | $ | — |
Unrecognized Tax Benefits |  | 3.7 |  |  | 3.8 |
Liabilities for Income Taxes |  | $ | 33.2 |  |  | $ | 3.8 |

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