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Net Financial Asset (Liability) Coal Trading Position Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - Coal Trading [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Predecessor |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure |  | $ (0.1)
Physical Commodity Purchase Sale Contracts Fair Value Disclosure |  | (0.4)
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure |  | (0.5)
Predecessor | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure |  | 0.0
Physical Commodity Purchase Sale Contracts Fair Value Disclosure |  | 0.0
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure |  | 0.0
Predecessor | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure |  | (0.1)
Physical Commodity Purchase Sale Contracts Fair Value Disclosure |  | 0.7
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure |  | 0.6
Predecessor | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure |  | 0.0
Physical Commodity Purchase Sale Contracts Fair Value Disclosure |  | (1.1)
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure |  | $ (1.1)
Successor |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure | $ (7.2) |
Physical Commodity Purchase Sale Contracts Fair Value Disclosure | (1.9) |
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure | (9.1) |
Successor | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure | (3.0) |
Physical Commodity Purchase Sale Contracts Fair Value Disclosure | 0.0 |
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure | (3.0) |
Successor | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure | (4.2) |
Physical Commodity Purchase Sale Contracts Fair Value Disclosure | (1.9) |
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure | (6.1) |
Successor | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Commodity Swaps And Options Fair Value Disclosure | 0.0 |
Physical Commodity Purchase Sale Contracts Fair Value Disclosure | 0.0 |
Coal Trading Assets and Liabilities, Net, Fair Value Disclosure | $ 0.0 |

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