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Coal Trading Textuals (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Jun. 30, 2017 | Dec. 31, 2016 USD ($)
Successor |  |  |
Coal Trading [Line Items] |  |  |
Number of major credit rating agencies that adjusted corporate credit rating | 1 | 2 |
Coal Trading [Member] |  |  |
Coal Trading [Line Items] |  |  |
Receivables from Brokers-Dealers and Clearing Organizations |  |  | $ 2.0
Coal Trading [Member] | Predecessor |  |  |
Coal Trading [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  | 57.4
Derivative, Collateral, Right to Reclaim Cash |  |  | 16.2
Potential collateralization that may be requested by counterparties due to a material adverse event |  |  | 2.0
Margin posted to counterparties related to credit rating |  |  | $ 1.0
Coal Trading [Member] | Successor |  |  |
Coal Trading [Line Items] |  |  |
Additional potential collateral requirements for a credit downgrade | $ 0.0 |  |
Receivables from Brokers-Dealers and Clearing Organizations | 1.8 |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | 35.8 |  |
Derivative, Collateral, Right to Reclaim Cash | 18.8 |  |
Potential collateralization that may be requested by counterparties due to a material adverse event | 7.0 |  |
Margin Posted To Counterparties Related To Material Adverse Event | 0.4 |  |
Margin posted to counterparties related to credit rating | $ 0.0 |  |
External Credit Rating, Investment Grade [Member] | Coal Trading [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Successor |  |  |
Coal Trading [Line Items] |  |  |
Credit Exposure Related to Coal Trading Activities | 71.00% |  |
Non Rated [Member] | Coal Trading [Member] | Credit Concentration Risk [Member] | Coal Trading Positions [Member] | Successor |  |  |
Coal Trading [Line Items] |  |  |
Credit Exposure Related to Coal Trading Activities | 29.00% |  |

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