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Revenues - Revenues by Contract Duration (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Successor |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 1,462.7 |
Successor | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 488.1 |
Successor | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 745.0 |
Successor | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 162.3 |
Successor | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 67.3 |
Successor | Operating Segments | Powder River Basin Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 389.3 |
Successor | Operating Segments | Powder River Basin Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 211.8 |
Successor | Operating Segments | Powder River Basin Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 131.6 |
Successor | Operating Segments | Powder River Basin Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 45.8 |
Successor | Operating Segments | Powder River Basin Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.1 |
Successor | Operating Segments | Australian Thermal Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 201.4 |
Successor | Operating Segments | Australian Thermal Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 44.6 |
Successor | Operating Segments | Australian Thermal Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 132.7 |
Successor | Operating Segments | Australian Thermal Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 23.7 |
Successor | Operating Segments | Australian Thermal Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.4 |
Successor | Operating Segments | Australian Metallurgical Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 466.2 |
Successor | Operating Segments | Australian Metallurgical Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7.6 |
Successor | Operating Segments | Australian Metallurgical Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 389.9 |
Successor | Operating Segments | Australian Metallurgical Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 67.8 |
Successor | Operating Segments | Australian Metallurgical Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.9 |
Successor | Operating Segments | Western U.S. Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 143.7 |
Successor | Operating Segments | Western U.S. Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 117.7 |
Successor | Operating Segments | Western U.S. Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 9.6 |
Successor | Operating Segments | Western U.S. Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 11.0 |
Successor | Operating Segments | Western U.S. Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5.4 |
Successor | Operating Segments | Midwestern U.S. Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 201.7 |
Successor | Operating Segments | Midwestern U.S. Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 106.4 |
Successor | Operating Segments | Midwestern U.S. Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 81.2 |
Successor | Operating Segments | Midwestern U.S. Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 14.0 |
Successor | Operating Segments | Midwestern U.S. Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.1 |
Successor | Corporate, Non-Segment | Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 40.3 |
Successor | Corporate, Non-Segment | Corporate and Other | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 |
Successor | Corporate, Non-Segment | Corporate and Other | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 |
Successor | Corporate, Non-Segment | Corporate and Other | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 |
Successor | Corporate, Non-Segment | Corporate and Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 40.3 |
Successor | Corporate, Non-Segment | Trading and Brokerage |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 20.1 |
Successor | Corporate, Non-Segment | Trading and Brokerage | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 |
Successor | Corporate, Non-Segment | Trading and Brokerage | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 |
Successor | Corporate, Non-Segment | Trading and Brokerage | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 |
Successor | Corporate, Non-Segment | Trading and Brokerage | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 20.1 |
Predecessor |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | $ 1,326.2
Predecessor | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 526.2
Predecessor | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 528.7
Predecessor | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 215.2
Predecessor | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 56.1
Predecessor | Operating Segments | Powder River Basin Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 394.3
Predecessor | Operating Segments | Powder River Basin Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 238.5
Predecessor | Operating Segments | Powder River Basin Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 119.2
Predecessor | Operating Segments | Powder River Basin Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 36.6
Predecessor | Operating Segments | Powder River Basin Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Operating Segments | Australian Thermal Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 224.8
Predecessor | Operating Segments | Australian Thermal Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 33.4
Predecessor | Operating Segments | Australian Thermal Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 100.7
Predecessor | Operating Segments | Australian Thermal Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 90.4
Predecessor | Operating Segments | Australian Thermal Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.3
Predecessor | Operating Segments | Australian Metallurgical Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 328.9
Predecessor | Operating Segments | Australian Metallurgical Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 4.9
Predecessor | Operating Segments | Australian Metallurgical Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 235.7
Predecessor | Operating Segments | Australian Metallurgical Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 84.0
Predecessor | Operating Segments | Australian Metallurgical Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 4.3
Predecessor | Operating Segments | Western U.S. Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 149.7
Predecessor | Operating Segments | Western U.S. Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 119.4
Predecessor | Operating Segments | Western U.S. Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 9.9
Predecessor | Operating Segments | Western U.S. Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 4.2
Predecessor | Operating Segments | Western U.S. Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 16.2
Predecessor | Operating Segments | Midwestern U.S. Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 193.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 130.0
Predecessor | Operating Segments | Midwestern U.S. Mining | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 63.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Operating Segments | Midwestern U.S. Mining | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 20.3
Predecessor | Corporate, Non-Segment | Corporate and Other | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 20.3
Predecessor | Corporate, Non-Segment | Trading and Brokerage |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 15.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Long-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Short-term contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Spot |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | 0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | $ 15.0

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