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v3.20.1

Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 846.2 | $ 1,250.6
Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 651.4 | 866.3
Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 192.5 | 323.7
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2.3 | 60.6
Domestic | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 487.7 | 647.4
Export | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 163.7 | 218.9
Export | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 192.5 | 323.7
Seaborne Thermal Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 201.1 | 251.0
Seaborne Thermal Mining | Operating Segments | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 200.2 | 250.3
Seaborne Thermal Mining | Operating Segments | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Seaborne Thermal Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.9 | 0.7
Seaborne Thermal Mining | Operating Segments | Domestic | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 36.5 | 38.4
Seaborne Thermal Mining | Operating Segments | Export | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 163.7 | 211.9
Seaborne Thermal Mining | Operating Segments | Export | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 193.2 | 324.5
Seaborne Metallurgical Mining | Operating Segments | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 192.5 | 323.7
Seaborne Metallurgical Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.7 | 0.8
Seaborne Metallurgical Mining | Operating Segments | Domestic | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 192.5 | 323.7
Powder River Basin Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 266.6 | 287.3
Powder River Basin Mining | Operating Segments | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 266.6 | 287.3
Powder River Basin Mining | Operating Segments | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Powder River Basin Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Powder River Basin Mining | Operating Segments | Domestic | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 266.6 | 287.3
Powder River Basin Mining | Operating Segments | Export | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Powder River Basin Mining | Operating Segments | Export | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Other U.S. Thermal Mining [Member] | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 192.3 | 334.8
Other U.S. Thermal Mining [Member] | Operating Segments | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 184.6 | 328.7
Other U.S. Thermal Mining [Member] | Operating Segments | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Other U.S. Thermal Mining [Member] | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7.7 | 6.1
Other U.S. Thermal Mining [Member] | Operating Segments | Domestic | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 184.6 | 321.7
Other U.S. Thermal Mining [Member] | Operating Segments | Export | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 7.0
Other U.S. Thermal Mining [Member] | Operating Segments | Export | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (7.0) | 53.0
Corporate and Other | Corporate, Non-Segment | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (7.0) | 53.0
Corporate and Other | Corporate, Non-Segment | Domestic | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Export | Thermal coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Export | Metallurgical coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0.0 | $ 0.0

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