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Coal Trading - Fair Value (Details) - Coal Trading - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Successor | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair value coal trading net assets (liabilities) measured on recurring basis: |  |  |  |  |  |
Futures, swaps and options |  |  |  |  | $ 0.2 | $ (7.2)
Physical purchase/sale contracts |  |  |  |  | 2.2 | (1.9)
Total net financial assets (liabilities) |  |  |  |  | 2.4 | (9.1)
Successor | Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair value coal trading net assets (liabilities) measured on recurring basis: |  |  |  |  |  |
Futures, swaps and options |  |  |  |  | 0.2 | (3.0)
Physical purchase/sale contracts |  |  |  |  | 0.0 | 0.0
Total net financial assets (liabilities) |  |  |  |  | 0.2 | (3.0)
Successor | Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair value coal trading net assets (liabilities) measured on recurring basis: |  |  |  |  |  |
Futures, swaps and options |  |  |  |  | 0.0 | (4.2)
Physical purchase/sale contracts |  |  |  |  | 2.2 | (1.9)
Total net financial assets (liabilities) |  |  |  |  | 2.2 | (6.1)
Successor | Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair value coal trading net assets (liabilities) measured on recurring basis: |  |  |  |  |  |
Futures, swaps and options |  |  |  |  | 0.0 | 0.0
Physical purchase/sale contracts |  |  |  |  | 0.0 | 0.0
Total net financial assets (liabilities) |  |  |  |  | $ 0.0 | $ 0.0
Scenario, Forecast | Level 3 |  |  |  |  |  |
Fair value coal trading net assets (liabilities) measured on recurring basis: |  |  |  |  |  |
Estimated Future Realization of Trading Portfolio | 100.00% | (8.00%) | 25.00% | 83.00% |  |

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