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Intangible Contract Assets and Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2020
Revenue Recognition [Abstract] |
Schedule Of Intangible Assets And Liabilities | The balances, net of accumulated amortization, and respective balance sheet classifications at June 30, 2020 and December 31, 2019, are set forth in the following tables:
| June 30, 2020 |  |  |  |
| Assets |  | Liabilities |  | Net Total
| (Dollars in millions) |  |  |  |
Coal supply agreements | $ | 10.1 |  |  | $ | (19.0) |  |  | $ | (8.9) |
Take-or-pay contracts | — |  |  | (33.7) |  |  | (33.7) |
Total | $ | 10.1 |  |  | $ | (52.7) |  |  | $ | (42.6) |
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 10.1 |  |  | $ | — |  |  | $ | 10.1 |
Accounts payable and accrued expenses | — |  |  | (4.7) |  |  | (4.7) |
Other noncurrent liabilities | — |  |  | (48.0) |  |  | (48.0) |
Total | $ | 10.1 |  |  | $ | (52.7) |  |  | $ | (42.6) |
| December 31, 2019 |  |  |  |
| Assets |  | Liabilities |  | Net Total
| (Dollars in millions) |  |  |  |
Coal supply agreements | $ | 20.7 |  |  | $ | (21.4) |  |  | $ | (0.7) |
Take-or-pay contracts | — |  |  | (40.0) |  |  | (40.0) |
Total | $ | 20.7 |  |  | $ | (61.4) |  |  | $ | (40.7) |
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 20.7 |  |  | $ | — |  |  | $ | 20.7 |
Accounts payable and accrued expenses | — |  |  | (8.4) |  |  | (8.4) |
Other noncurrent liabilities | — |  |  | (53.0) |  |  | (53.0) |
Total | $ | 20.7 |  |  | $ | (61.4) |  |  | $ | (40.7) |

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