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Commitments and Contingencies (Details) AUD in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 336 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2017 USD ($) | Dec. 31, 2017 AUD | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2042 | Dec. 31, 2017 USD ($) | Mar. 16, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 AUD
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Annual payments on coal reserves 2013 to 2016 | $ 247.9 |  | $ 247.9 |  |  |  |  |  |  |
Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease |  |  | 42.1 | $ 42.1 | $ 42.1 |  |  |  |  |
Annual Coal Reserve Payments Pursuant To Caballo West Lease |  |  | 28.6 | 28.6 | 28.6 |  |  |  |  |
Annual true up payments for the excess of the $1.10 bid price versus $0.95 under the transferred lease |  |  | $ 3.9 | $ 3.9 | $ 3.9 |  |  |  |  |
Predecessor | Berenergy [Member] |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation Settlement Damages Awarded to Plaintiff |  |  |  |  |  |  | $ 0.9 |  |  |
Loss Contingency Accrual |  |  |  |  |  |  |  |  | $ 13.1 |
Predecessor | Wilkie Creek [Member] |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement charges total |  |  |  |  |  |  |  |  | $ 9.9 | AUD 13.0
Predecessor | Debtors vs. Blue Tee [Member] |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Bankruptcy Claims, Amount of Tax Refunds to be Foregone to Settle Claims |  |  |  |  |  |  |  | $ 11.0 |  |
Bankruptcy Claims, Amount to be Transferred to Settle Claims |  |  |  |  |  |  |  | 12.0 |  |
Bankruptcy Claims, Amount to be Paid to Settle Claims |  |  |  |  |  |  |  | $ 20.0 |  |
Successor |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Take-or-pay obligations |  |  |  |  |  |  | 1,336.5 |  |  |
Take-or-pay Obligations Due In One Year |  |  |  |  |  |  | 182.2 |  |  |
Successor | Capital Additions [Member] |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitments for capital expenditures |  |  |  |  |  |  | 159.0 |  |  |
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months |  |  |  |  |  |  | $ 41.9 |  |  |
Successor | Monto Coal Pty Limited [Member] |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | AUD |  | AUD 15.6 |  |  |  |  |  |  |  |
LossContingencyDamagesSoughtValueMax | AUD |  | AUD 1,800.0 |  |  |  |  |  |  |  |
Ownership Percentage In Subsidiaries |  |  |  |  |  |  | 51.00% |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Take-or-pay Arrangement Terms Years (Maximum) |  |  |  |  |  | 25 |  |  |  |

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