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Leases Leases (Tables) | 12 Months Ended
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Dec. 31, 2016
Operating Leased Assets [Line Items] |
Leases And Royalty Future Minimum Payments [Table Text Block] | Future minimum lease and royalty payments as of December 31, 2016 are as follows:
|  | Capital Leases |  | Operating Leases |  | Coal Lease and Royalty Obligations
Year Ending December 31, |  |  |
|  | (Dollars in millions)
2017 |  | $ | 7.3 |  |  | $ | 148.7 |  |  | $ | 6.1 |
2018 |  | 8.9 |  |  | 100.4 |  |  | 5.7 |
2019 |  | 0.5 |  |  | 60.2 |  |  | 5.2 |
2020 |  | 0.5 |  |  | 26.4 |  |  | 4.9 |
2021 |  | 0.5 |  |  | 10.6 |  |  | 5.3 |
2022 and thereafter |  | 9.6 |  |  | 26.6 |  |  | 26.6 |
Total minimum lease payments |  | 27.3 |  |  | $ | 372.9 |  |  | $ | 53.8 |
Less interest |  | 7.6 |  |  |  |  |  |  |
Present value of minimum capital lease payments |  | $ | 19.7 |  |  |  |  |  |  |

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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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