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Segment and Geographic Information Reconciliation of Assets by Segment to Consolidated Total Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Predecessor |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 11,777.7 | $ 10,946.9
Property, Plant and Equipment, Net |  | 8,776.7 | 9,258.5
Predecessor | U.S. Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 4,255.9 | 4,105.8
Property, Plant and Equipment, Net |  | 3,970.6 | 3,854.5
Predecessor | Australian Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 5,402.2 | 5,319.9
Property, Plant and Equipment, Net |  | 3,905.8 | 4,469.6
Predecessor | Trading and Brokerage |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 128.7 | 217.2
Property, Plant and Equipment, Net |  | 0.2 | 0.5
Predecessor | Corporate and Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 1,990.9 | 1,304.0
Property, Plant and Equipment, Net |  | $ 900.1 | $ 933.9
Successor |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 8,181.2 |  |
Property, Plant and Equipment, Net | 5,111.9 |  |
Successor | U.S. Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 3,848.6 |  |
Property, Plant and Equipment, Net | 3,361.0 |  |
Successor | Australian Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 2,656.3 |  |
Property, Plant and Equipment, Net | 1,501.7 |  |
Successor | Trading and Brokerage |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 99.1 |  |
Property, Plant and Equipment, Net | 0.5 |  |
Successor | Corporate and Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,577.2 |  |
Property, Plant and Equipment, Net | $ 248.7 |  |

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