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Revenue Recognition - Revenues by Contract Duration (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 626.7 | $ 1,149.0 | $ 1,472.9 | $ 2,399.6
One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 481.4 | 953.8 | 1,148.8 | 1,951.6
Less than one year |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 121.7 | 141.4 | 298.2 | 333.6
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 23.6 | 53.8 | 25.9 | 114.4
Seaborne Thermal Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 162.0 | 220.2 | 363.1 | 471.2
Seaborne Thermal Mining | Operating Segments | One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 79.5 | 150.6 | 178.8 | 321.7
Seaborne Thermal Mining | Operating Segments | Less than one year |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 82.3 | 69.3 | 183.2 | 148.5
Seaborne Thermal Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.2 | 0.3 | 1.1 | 1.0
Seaborne Metallurgical Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 91.6 | 290.9 | 284.8 | 615.4
Seaborne Metallurgical Mining | Operating Segments | One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 64.1 | 242.7 | 204.2 | 475.5
Seaborne Metallurgical Mining | Operating Segments | Less than one year |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27.3 | 47.6 | 79.7 | 138.5
Seaborne Metallurgical Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.2 | 0.6 | 0.9 | 1.4
Powder River Basin Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 205.8 | 282.6 | 472.4 | 569.9
Powder River Basin Mining | Operating Segments | One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 195.7 | 269.7 | 439.1 | 549.8
Powder River Basin Mining | Operating Segments | Less than one year |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10.1 | 12.8 | 33.3 | 20.0
Powder River Basin Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.1 | 0.0 | 0.1
Other U.S. Thermal Mining [Member] | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 152.0 | 309.6 | 344.3 | 644.4
Other U.S. Thermal Mining [Member] | Operating Segments | One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 142.1 | 290.8 | 326.7 | 604.6
Other U.S. Thermal Mining [Member] | Operating Segments | Less than one year |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2.0 | 11.7 | 2.0 | 26.6
Other U.S. Thermal Mining [Member] | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7.9 | 7.1 | 15.6 | 13.2
Corporate and Other | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15.3 | 45.7 | 8.3 | 98.7
Corporate and Other | Corporate, Non-Segment | One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Less than one year |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 15.3 | $ 45.7 | $ 8.3 | $ 98.7

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