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Segment and Geographic Information Reconciliation of Assets by Segment to Consolidated Total Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Successor |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 7,423.7 | $ 8,181.2 |
Property, plant, equipment and mine development, net | 5,207.0 | 5,111.9 |
Successor | U.S. Thermal Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 3,481.7 | 3,846.5 |
Property, plant, equipment and mine development, net | 3,180.4 | 3,361.0 |
Successor | Seaborne Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 2,044.6 | 2,339.6 |
Property, plant, equipment and mine development, net | 1,661.3 | 1,501.7 |
Successor | Corporate and Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,897.4 | 1,995.1 |
Property, plant, equipment and mine development, net | $ 365.3 | $ 249.2 |
Predecessor |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  |  | $ 11,777.7
Property, plant, equipment and mine development, net |  |  | 8,776.7
Predecessor | U.S. Thermal Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  |  | 4,255.9
Property, plant, equipment and mine development, net |  |  | 3,970.6
Predecessor | Seaborne Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  |  | 5,402.2
Property, plant, equipment and mine development, net |  |  | 3,905.8
Predecessor | Corporate and Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  |  | 2,119.6
Property, plant, equipment and mine development, net |  |  | $ 900.3

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