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Intangible Contract Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Intangible Contract Assets and Liabilities Disclosure [Abstract] |
Schedule Of Intangible Assets And Liabilities [Table Text Block] | The balances, net of accumulated amortization, and respective balance sheet classifications at December 31, 2019 and 2018, are set forth in the following tables:
| 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 | )
| December 31, 2018
| Assets |  | Liabilities |  | Net Total
| (Dollars in millions)
Coal supply agreements | $ | 70.9 |  |  | $ | (32.9 | ) |  | $ | 38.0 |
Take-or-pay contracts | — |  |  | (57.1 | ) |  | (57.1 | )
Total | $ | 70.9 |  |  | $ | (90.0 | ) |  | $ | (19.1 | )
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 70.9 |  |  | $ | — |  |  | $ | 70.9 |
Accounts payable and accrued expenses | — |  |  | (20.3 | ) |  | (20.3 | )
Other noncurrent liabilities | — |  |  | (69.7 | ) |  | (69.7 | )
Total | $ | 70.9 |  |  | $ | (90.0 | ) |  | $ | (19.1 | )

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