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Derivatives and Fair Value Measurements Texuals (Details) T in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2019 T | Sep. 30, 2019 $ / $ | Dec. 31, 2018 USD ($) T | Dec. 31, 2018 AUD ($) T | Dec. 31, 2017 USD ($)
Successor | Coal Trading |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  |  | $ 21.8 |  | $ 35.8
Derivative, Collateral, Right to Reclaim Cash |  |  |  | 16.7 |  | 18.8
Receivables from Brokers-Dealers and Clearing Organizations |  |  |  | 2.2 |  | 1.8
Potential collateralization that may be requested by counterparties due to a material adverse event |  |  |  | $ 1.3 |  | 7.0
Margin posted to counterparties related to credit rating |  |  |  |  |  | $ 0.4
Successor | External Credit Rating, Investment Grade | Coal Trading Positions | Credit Concentration Risk | Coal Trading |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Credit Exposure Related to Coal Trading Activities |  |  |  | 27.00% | 27.00% |
Successor | Non Rated | Coal Trading Positions | Credit Concentration Risk | Coal Trading |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Credit Exposure Related to Coal Trading Activities |  |  |  | 73.00% | 73.00% |
Successor | Foreign currency option contracts |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 875.0 |
Successor | Foreign currency option contracts |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 0.0 |
Successor | Coal |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T |  |  |  | 1.7 | 1.7 |
Successor | Diesel Fuel Hedge Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 0.0 |
Predecessor | Designated as Hedging Instrument |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Loss reclassified from other comprehensive income into income (ineffective portion) | $ (84.4) |  |  |  |  |
Predecessor | Foreign currency option contracts | Designated as Hedging Instrument |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Loss reclassified from other comprehensive income into income (ineffective portion) | (33.7) |  |  |  |  |
Predecessor | Commodity swap contracts and foreign currency forward contracts | Designated as Hedging Instrument | Reorganization items |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Loss reclassified from other comprehensive income into income (ineffective portion) | $ (75.2) |  |  |  |  |
Scenario, Forecast | Foreign currency option contracts | Minimum |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  |  | 0.77 |  |  |
Scenario, Forecast | Foreign currency option contracts | Maximum |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  |  | 0.78 |  |  |
Scenario, Forecast | Coal |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T |  | 0.8 |  |  |  |

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