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Coal Trading (Tables) - Coal Trading [Member] | 12 Months Ended
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Dec. 31, 2016
Coal Trading [Line Items] |
Trading revenue by type of instrument | Trading revenues recognized during the years ended December 31, 2016, 2015 and 2014 were as follows:
|  | Year Ended December 31,
Trading Revenues by Type of Instrument |  | 2016 |  | 2015 |  | 2014
|  | (Dollars in millions)
Commodity futures, swaps and options |  | $ | (96.5 | ) |  | $ | 107.3 |  |  | $ | 92.3 |
Physical commodity purchase/sale contracts |  | 85.6 |  |  | (64.5 | ) |  | (33.9 | )
Total trading revenues |  | $ | (10.9 | ) |  | $ | 42.8 |  |  | $ | 58.4 |
Fair value of assets and liabilities from coal trading activities and related balance sheet offsetting disclosures | The fair value of assets and liabilities from coal trading activities presented on a gross and net basis as of December 31, 2016 and 2015 is set forth below:
Affected line item in the consolidated balance sheets |  | Gross Amounts of Recognized Assets (Liabilities) |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Variation margin (held) posted (1) |  | Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets
|  | (Dollars in millions)
|  | Fair Value as of December 31, 2016
Assets from coal trading activities, net |  | $ | 191.2 |  |  | $ | (190.5 | ) |  | $ | — |  |  | $ | 0.7 |
Liabilities from coal trading activities, net |  | (249.1 | ) |  | 190.5 |  |  | 57.4 |  |  | (1.2 | )
Total, net |  | $ | (57.9 | ) |  | $ | — |  |  | $ | 57.4 |  |  | $ | (0.5 | )
|  | Fair Value as of December 31, 2015
Assets from coal trading activities, net |  | $ | 128.6 |  |  | $ | (87.3 | ) |  | $ | (17.8 | ) |  | $ | 23.5 |
Liabilities from coal trading activities, net |  | (110.0 | ) |  | 87.3 |  |  | 7.1 |  |  | (15.6 | )
Total, net |  | $ | 18.6 |  |  | $ | — |  |  | $ | (10.7 | ) |  | $ | 7.9 |
(1) | None of the net variation margin (held) posted at December 31, 2016 and 2015, respectively, related to cash flow hedges.
Fair value coal trading net assets (liabilities) measured on recurring basis | The following tables set forth the hierarchy of the Company’s net financial asset (liability) coal trading positions for which fair value is measured on a recurring basis as of December 31, 2016 and 2015:
| December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Commodity futures, swaps and options | $ | — |  |  | $ | (0.1 | ) |  | $ | — |  |  | $ | (0.1 | )
Physical commodity purchase/sale contracts | — |  |  | 0.7 |  |  | (1.1 | ) |  | (0.4 | )
Total net financial assets (liabilities) | $ | — |  |  | $ | 0.6 |  |  | $ | (1.1 | ) |  | $ | (0.5 | )
| December 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (Dollars in millions) |  |
Commodity futures, swaps and options | $ | — |  |  | $ | 3.3 |  |  | $ | — |  |  | $ | 3.3 |
Physical commodity purchase/sale contracts | — |  |  | 20.2 |  |  | (15.6 | ) |  | 4.6 |
Total net financial assets (liabilities) | $ | — |  |  | $ | 23.5 |  |  | $ | (15.6 | ) |  | $ | 7.9 |
Schedule of quantitative unobservable inputs, physical commodity purchase/sale contracts | The following table summarizes the quantitative unobservable inputs utilized in the Company's internally-developed valuation models for physical purchase/sale contracts classified as Level 3 as of December 31, 2016:
|  | Range |  | Weighted
Input |  | Low |  | High |  | Average
Quality adjustments |  | 2 | % |  | 2 | % |  | 2 | %
Credit and non-performance risk |  | 26 | % |  | 26 | % |  | 26 | %
Change in the Company's recurring Level 3 net financial assets | The following table summarizes the changes in the Company’s recurring Level 3 net financial assets:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Beginning of period | $ | (15.6 | ) |  | $ | 2.1 |  |  | $ | 2.1 |
Transfers into Level 3 | 5.3 |  |  | (4.4 | ) |  | — |
Transfers out of Level 3 | (0.4 | ) |  | — |  |  | — |
Total gains realized/unrealized: |  |  |  |  |  |  |  |
Included in earnings | (2.4 | ) |  | (10.1 | ) |  | 6.7 |
Purchases | — |  |  | (0.5 | ) |  | — |
Sales | — |  |  | (0.1 | ) |  | — |
Settlements | 12.0 |  |  | (2.6 | ) |  | (6.7 | )
End of period | $ | (1.1 | ) |  | $ | (15.6 | ) |  | $ | 2.1 |
Changes in unrealized gains (losses) relating to Level 3 net financial assets | The following table summarizes the changes in net unrealized (losses) gains relating to Level 3 net financial assets held both as of the beginning and the end of the period:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Changes in unrealized (losses) gains (1) | $ | — |  |  | $ | (6.2 | ) |  | $ | 2.1 |
(1) | Within the consolidated statements of operations and consolidated statements of comprehensive income for the periods presented, unrealized gains and losses from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods.
Schedule of future realization of the Company's trading portfolio | As of December 31, 2016, the estimated future realization of the value of the Company’s trading portfolio is expected to all be realized in 2017.

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1),(d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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