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Intangible Contract Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Intangible Contract Assets and Liabilities Disclosure [Abstract] |
Schedule Of Intangible Assets And Liabilities [Table Text Block] | The balances and respective balance sheet classifications of such assets and liabilities at December 31, 2017, net of accumulated amortization, are set forth in the following table:
| Successor
| December 31, 2017
| (Dollars in millions)
| Assets |  | Liabilities |  | Net Total
Coal supply agreements | $ | 177.2 |  |  | $ | (42.7 | ) |  | $ | 134.5 |
Take-or-pay contracts | — |  |  | (106.1 | ) |  | (106.1 | )
Total | $ | 177.2 |  |  | $ | (148.8 | ) |  | $ | 28.4 |
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 177.2 |  |  | $ | — |  |  | $ | 177.2 |
Accounts payable and accrued expenses | — |  |  | (42.0 | ) |  | (42.0 | )
Other noncurrent liabilities | — |  |  | (106.8 | ) |  | (106.8 | )
Total | $ | 177.2 |  |  | $ | (148.8 | ) |  | $ | 28.4 |

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- Definition Intangible Contract Assets and Liabilities Disclosure [Abstract] + References No definition available. + Details
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- Definition Schedule Of Intangible Assets And Liabilities [Table Text Block] + References No definition available. + Details
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