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Coal Trading (Tables) | 3 Months Ended
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Mar. 31, 2018
Coal Trading [Abstract] |
Trading revenues by type of instrument | Trading revenues (losses) recognized during the periods presented below were as follows:
|  | Successor | Predecessor
Trading Revenues by Type of Instrument |  | Three Months Ended March 31, 2018 | Three Months Ended March 31, 2017
|  | (Dollars in millions)
Futures, swaps and options |  | $ | (16.9 | ) | $ | (10.2 | )
Physical purchase/sale contracts |  | 37.0 |  | 25.2 |
Total trading revenues |  | $ | 20.1 |  | $ | 15.0 |
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 March 31, 2018 and December 31, 2017 is set forth below:
Affected Line Item in the Condensed Consolidated Balance Sheets |  | Gross Amounts of Recognized Assets (Liabilities) |  | Gross Amounts Offset in the Condensed Consolidated Balance Sheets |  | Variation Margin Posted (1) |  | Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets
|  | (Dollars in millions)
|  | Fair Value as of March 31, 2018
Assets from coal trading activities, net |  | $ | 53.6 |  |  | $ | (42.4 | ) |  | $ | — |  |  | $ | 11.2 |
Liabilities from coal trading activities, net |  | (57.9 | ) |  | 42.4 |  |  | 6.7 |  |  | (8.8 | )
Total, net |  | $ | (4.3 | ) |  | $ | — |  |  | $ | 6.7 |  |  | $ | 2.4 |
|  | Fair Value as of December 31, 2017
Assets from coal trading activities, net |  | $ | 77.1 |  |  | $ | (74.5 | ) |  | $ | — |  |  | $ | 2.6 |
Liabilities from coal trading activities, net |  | (122.0 | ) |  | 74.5 |  |  | 35.8 |  |  | (11.7 | )
Total, net |  | $ | (44.9 | ) |  | $ | — |  |  | $ | 35.8 |  |  | $ | (9.1 | )
(1) | None of the net variation margin posted at March 31, 2018 and December 31, 2017 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 March 31, 2018 and December 31, 2017:
| March 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Futures, swaps and options | $ | 0.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.2 |
Physical purchase/sale contracts | — |  |  | 2.2 |  |  | — |  |  | 2.2 |
Total net financial assets | $ | 0.2 |  |  | $ | 2.2 |  |  | $ | — |  |  | $ | 2.4 |
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Futures, swaps and options | $ | (3.0 | ) |  | $ | (4.2 | ) |  | $ | — |  |  | $ | (7.2 | )
Physical purchase/sale contracts | — |  |  | (1.9 | ) |  | — |  |  | (1.9 | )
Total net financial liabilities | $ | (3.0 | ) |  | $ | (6.1 | ) |  | $ | — |  |  | $ | (9.1 | )
Schedule Of Future Realization Of Trading Portfolio | As of March 31, 2018, the timing of the estimated future realization of the value of the Company’s trading portfolio was as follows:
|  | Percentage of
Year of Expiration |  | Portfolio Total
2018 |  | 83 | %
2019 |  | 25 | %
2020 |  | (8 | )%
|  | 100 | %

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- Definition Coal Trading. + References No definition available. + Details
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- Definition Schedule Of Future Realization Of Trading Portfolio. + References No definition available. + Details
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- Definition Trading Revenue by Type of Instrument. + References No definition available. + 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=84234895&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=84234895&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=84234895&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=84234895&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=84234895&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=84234895&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=84234895&loc=SL5624171-113959 Reference 8: 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=84234895&loc=SL5579240-113959 Reference 9: 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=84234895&loc=d3e41620-113959 Reference 10: 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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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