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Commitments and Contingencies (Details) $ in Millions, $ in Millions | 12 Months Ended | 336 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 AUD ($) | Dec. 31, 2042 | Dec. 31, 2018 USD ($) | Sep. 30, 2016 USD ($)
Successor |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Take-or-pay obligations |  |  | $ 1,300.0 |
Take-or-pay Obligations Due In One Year |  |  | 148.2 |
Successor | Capital Additions |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Purchase commitments for capital expenditures |  |  | 110.3 |
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months |  |  | 94.2 |
Successor | Monto Coal Pty Limited |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
LossContingencyDamagesSoughtValueMax | $ 1,100.0 |  |  |
Predecessor | Berenergy |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Loss Contingency Accrual |  |  |  | $ 13.1
Reasonable Value of Oil Reserves |  |  | $ 1.0 |
Scenario, Forecast |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Take-or-pay Arrangement Terms Years (Maximum) |  | 24 |  |

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- Definition Represents the estimated contractual cash spend in the next twelve months after the balance sheet date related to various short term take or pay arrangements in the U.S. and Australia associated with rail and port commitments for the delivery of coal including amounts relating to export facilities. + References No definition available. + Details
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