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Leases (Tables) | 12 Months Ended
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Dec. 31, 2017
Operating Leased Assets [Line Items] |
Leases And Royalty Future Minimum Payments [Table Text Block] | Future minimum lease and royalty payments as of December 31, 2017 are as follows:
|  | Capital Leases |  | Operating Leases |  | Coal Lease and Royalty Obligations
Year Ending December 31, |  |  |
|  | (Dollars in millions)
2018 |  | $ | 39.9 |  |  | $ | 68.5 |  |  | $ | 6.9 |
2019 |  | 28.1 |  |  | 46.7 |  |  | 6.7 |
2020 |  | 8.1 |  |  | 39.3 |  |  | 6.5 |
2021 |  | 0.5 |  |  | 29.0 |  |  | 6.3 |
2022 |  | 0.5 |  |  | 11.2 |  |  | 6.1 |
2023 and thereafter |  | 9.2 |  |  | 22.9 |  |  | 33.0 |
Total minimum lease payments |  | 86.3 |  |  | $ | 217.6 |  |  | $ | 65.5 |
Less interest |  | 10.3 |  |  |  |  |  |  |
Present value of minimum capital lease payments |  | $ | 76.0 |  |  |  |  |  |  |

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- Definition Leases And Royalty Future Minimum Payments Net Minimum Payments + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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