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Leases (Tables) | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Leases And Royalty Future Minimum Payments [Table Text Block] | Future minimum lease and royalty payments as of December 31, 2018 are as follows:
|  | Capital Leases |  | Operating Leases |  | Coal Lease and Royalty Obligations
Year Ending December 31, |  |  |
|  | (Dollars in millions)
2019 |  | $ | 28.2 |  |  | $ | 47.6 |  |  | $ | 5.4 |
2020 |  | 8.0 |  |  | 27.6 |  |  | 5.5 |
2021 |  | 0.4 |  |  | 15.9 |  |  | 5.6 |
2022 |  | 0.4 |  |  | 11.8 |  |  | 5.4 |
2023 |  | 0.5 |  |  | 12.1 |  |  | 5.5 |
2024 and thereafter |  | 8.8 |  |  | 12.1 |  |  | 36.2 |
Total minimum lease payments |  | 46.3 |  |  | $ | 127.1 |  |  | $ | 63.6 |
Less interest |  | 6.3 |  |  |  |  |  |  |
Present value of minimum capital lease payments |  | $ | 40.0 |  |  |  |  |  |  |

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