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Revenues - Revenues by Contract Duration (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 1,250.6 | $ 1,462.7
One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 997.8 | 1,233.1
Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 192.2 | 162.3
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 60.6 | 67.3
Seaborne Thermal Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 251.0 | 201.4
Seaborne Thermal Mining | Operating Segments | One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 171.1 | 177.3
Seaborne Thermal Mining | Operating Segments | Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 79.2 | 23.7
Seaborne Thermal Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.7 | 0.4
Seaborne Metallurgical Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 324.5 | 466.2
Seaborne Metallurgical Mining | Operating Segments | One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 232.8 | 397.5
Seaborne Metallurgical Mining | Operating Segments | Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 90.9 | 67.8
Seaborne Metallurgical Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.8 | 0.9
Powder River Basin Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 287.3 | 389.3
Powder River Basin Mining | Operating Segments | One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 280.1 | 343.4
Powder River Basin Mining | Operating Segments | Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7.2 | 45.8
Powder River Basin Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.1
Midwestern U.S. Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 179.1 | 201.7
Midwestern U.S. Mining | Operating Segments | One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 167.8 | 187.6
Midwestern U.S. Mining | Operating Segments | Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 11.2 | 14.0
Midwestern U.S. Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.1 | 0.1
Western U.S. Mining | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 155.7 | 143.7
Western U.S. Mining | Operating Segments | One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 146.0 | 127.3
Western U.S. Mining | Operating Segments | Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3.7 | 11.0
Western U.S. Mining | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 6.0 | 5.4
Corporate and Other | Corporate, Non-Segment |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 53.0 | 60.4
Corporate and Other | Corporate, Non-Segment | One year or longer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Less than one year |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 53.0 | $ 60.4

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