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Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,106.4 | $ 1,412.6 | $ 3,506.0 | $ 4,184.7
Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 902.4 | 1,039.8 | 2,573.6 | 2,891.5
Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 215.4 | 369.4 | 829.4 | 1,251.9
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (11.4) | 3.4 | 103.0 | 41.3
Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 687.8 | 769.0 | 1,953.6 | 2,213.5
Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 214.6 | 270.8 | 620.0 | 678.0
Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 215.4 | 369.4 | 829.4 | 1,251.9
Seaborne Thermal Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 249.5 | 305.1 | 720.7 | 773.9
Seaborne Thermal Mining | Operating Segments | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 249.4 | 305.1 | 719.6 | 773.3
Seaborne Thermal Mining | Operating Segments | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Seaborne Thermal Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.1 | 0.0 | 1.1 | 0.6
Seaborne Thermal Mining | Operating Segments | Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34.8 | 37.4 | 110.9 | 112.0
Seaborne Thermal Mining | Operating Segments | Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 214.6 | 267.7 | 608.7 | 661.3
Seaborne Thermal Mining | Operating Segments | Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 216.3 | 370.3 | 831.7 | 1,254.0
Seaborne Metallurgical Mining | Operating Segments | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 215.4 | 369.4 | 829.4 | 1,251.9
Seaborne Metallurgical Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.9 | 0.9 | 2.3 | 2.1
Seaborne Metallurgical Mining | Operating Segments | Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 215.4 | 369.4 | 829.4 | 1,251.9
Powder River Basin Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 333.6 | 373.7 | 903.5 | 1,084.5
Powder River Basin Mining | Operating Segments | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 333.6 | 373.7 | 903.4 | 1,084.4
Powder River Basin Mining | Operating Segments | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Powder River Basin Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.1 | 0.1
Powder River Basin Mining | Operating Segments | Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 333.6 | 373.7 | 903.4 | 1,084.4
Powder River Basin Mining | Operating Segments | Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Powder River Basin Mining | Operating Segments | Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Midwestern U.S. Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 176.0 | 208.5 | 522.6 | 607.7
Midwestern U.S. Mining | Operating Segments | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 175.8 | 208.4 | 522.3 | 607.5
Midwestern U.S. Mining | Operating Segments | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Midwestern U.S. Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.2 | 0.1 | 0.3 | 0.2
Midwestern U.S. Mining | Operating Segments | Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 175.8 | 208.4 | 522.3 | 606.2
Midwestern U.S. Mining | Operating Segments | Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 1.3
Midwestern U.S. Mining | Operating Segments | Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Western U.S. Mining | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 150.4 | 156.1 | 448.2 | 439.4
Western U.S. Mining | Operating Segments | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 143.6 | 152.6 | 428.3 | 426.3
Western U.S. Mining | Operating Segments | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Western U.S. Mining | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6.8 | 3.5 | 19.9 | 13.1
Western U.S. Mining | Operating Segments | Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 143.6 | 149.5 | 417.0 | 410.9
Western U.S. Mining | Operating Segments | Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 3.1 | 11.3 | 15.4
Western U.S. Mining | Operating Segments | Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (19.4) | (1.1) | 79.3 | 25.2
Corporate and Other | Corporate, Non-Segment | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Metallurgical coal |  |  |  |
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 | (19.4) | (1.1) | 79.3 | 25.2
Corporate and Other | Corporate, Non-Segment | Domestic | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Export | Thermal coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Corporate, Non-Segment | Export | Metallurgical coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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