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Intangible Contract Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue Recognition [Abstract] |
Schedule Of Intangible Assets And Liabilities | The balances and respective balance sheet classifications of such assets and liabilities at March 31, 2018 and December 31, 2017, net of accumulated amortization, are set forth in the following tables:
| March 31, 2018
| (Dollars in millions)
| Assets |  | Liabilities |  | Net Total
Coal supply agreements | $ | 143.8 |  |  | $ | (38.6 | ) |  | $ | 105.2 |
Take-or-pay contracts | — |  |  | (81.1 | ) |  | (81.1 | )
Total | $ | 143.8 |  |  | $ | (119.7 | ) |  | $ | 24.1 |
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 143.8 |  |  | $ | — |  |  | $ | 143.8 |
Accounts payable and accrued expenses | — |  |  | (25.1 | ) |  | (25.1 | )
Other noncurrent liabilities | — |  |  | (94.6 | ) |  | (94.6 | )
Total | $ | 143.8 |  |  | $ | (119.7 | ) |  | $ | 24.1 |
| December 31, 2017
| (Dollars in millions)
| Assets |  | Liabilities |  | Net Total
Coal supply agreements | $ | 177.2 |  |  | $ | (42.7 | ) |  | $ | 134.5 |
Take-or-pay contracts | — |  |  | (90.7 | ) |  | (90.7 | )
Total | $ | 177.2 |  |  | $ | (133.4 | ) |  | $ | 43.8 |
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 177.2 |  |  | $ | — |  |  | $ | 177.2 |
Accounts payable and accrued expenses | — |  |  | (27.6 | ) |  | (27.6 | )
Other noncurrent liabilities | — |  |  | (105.8 | ) |  | (105.8 | )
Total | $ | 177.2 |  |  | $ | (133.4 | ) |  | $ | 43.8 |

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