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Coal Trading - Trading Revenues and Offsetting (Details) - Coal Trading - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Apr. 01, 2017 | Jun. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2016
Coal trading derivative instruments and balance sheet offsetting disclosures: |  |  |  |  |
Net variation margin (held) posted | $ 16,000,000 |  |  |  | $ 57,400,000
Cash Flow Hedging |  |  |  |  |
Coal trading derivative instruments and balance sheet offsetting disclosures: |  |  |  |  |
Net variation margin (held) posted | 0 |  |  |  | 0
Successor |  |  |  |  |
Trading Revenues by Type of Instrument [Line Items] |  |  |  |  |
Total trading revenues (losses) | 5,200,000 |  |  |  |
Coal trading derivative instruments and balance sheet offsetting disclosures: |  |  |  |  |
Assets from coal trading activities, gross amounts of recognized assets | 145,500,000 |  |  |  |
Liabilities from coal trading activities, gross amounts of recognized liabilities | (162,100,000) |  |  |  |
Assets and (liabilities) from coal trading activities, net amounts recognized before the application of variation margin | (16,600,000) |  |  |  |
Gross amounts of coal trading liabilities offset against associated coal trading assets | (144,900,000) |  |  |  |
Gross amounts of coal trading assets offset against associated coal trading liabilities | 144,900,000 |  |  |  |
Net coal trading (liabilities) assets offset against associated assets (liabilities) | 0 |  |  |  |
Variation margin held offset against assets from coal trading activities | 0 |  |  |  |
Variation margin posted offset against liabilities from coal trading activities | 16,000,000 |  |  |  |
Net variation margin (held) posted | 16,000,000 |  |  |  |
Assets from coal trading activities, net | 600,000 |  |  |  |
Liabilities from coal trading activities, net | (1,200,000) |  |  |  |
Net assets (liabilities) from coal trading activities | (600,000) |  |  |  |
Predecessor |  |  |  |  |
Trading Revenues by Type of Instrument [Line Items] |  |  |  |  |
Total trading revenues (losses) |  | $ 15,000,000 | $ 17,500,000 | $ 13,800,000 |
Coal trading derivative instruments and balance sheet offsetting disclosures: |  |  |  |  |
Assets from coal trading activities, gross amounts of recognized assets |  |  |  |  | 191,200,000
Liabilities from coal trading activities, gross amounts of recognized liabilities |  |  |  |  | (249,100,000)
Assets and (liabilities) from coal trading activities, net amounts recognized before the application of variation margin |  |  |  |  | (57,900,000)
Gross amounts of coal trading liabilities offset against associated coal trading assets |  |  |  |  | (190,500,000)
Gross amounts of coal trading assets offset against associated coal trading liabilities |  |  |  |  | 190,500,000
Net coal trading (liabilities) assets offset against associated assets (liabilities) |  |  |  |  | 0
Variation margin held offset against assets from coal trading activities |  |  |  |  | 0
Variation margin posted offset against liabilities from coal trading activities |  |  |  |  | 57,400,000
Net variation margin (held) posted |  |  |  |  | 57,400,000
Assets from coal trading activities, net |  |  |  |  | 700,000
Liabilities from coal trading activities, net |  |  |  |  | (1,200,000)
Net assets (liabilities) from coal trading activities |  |  |  |  | $ (500,000)
Futures, swaps and options | Successor |  |  |  |  |
Trading Revenues by Type of Instrument [Line Items] |  |  |  |  |
Total trading revenues (losses) | (7,300,000) |  |  |  |
Futures, swaps and options | Predecessor |  |  |  |  |
Trading Revenues by Type of Instrument [Line Items] |  |  |  |  |
Total trading revenues (losses) |  | (10,200,000) | (19,300,000) | (23,100,000) |
Physical purchase/sale contracts | Successor |  |  |  |  |
Trading Revenues by Type of Instrument [Line Items] |  |  |  |  |
Total trading revenues (losses) | $ 12,500,000 |  |  |  |
Physical purchase/sale contracts | Predecessor |  |  |  |  |
Trading Revenues by Type of Instrument [Line Items] |  |  |  |  |
Total trading revenues (losses) |  | $ 25,200,000 | $ 36,800,000 | $ 36,900,000 |

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