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Segment Information Segment Results (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reportable segment results |  |  |  |
Revenues | $ 1,106.4 | $ 1,412.6 | $ 3,506.0 | $ 4,184.7
Total Adjusted EBITDA | 150.3 | 372.1 | 632.2 | 1,105.6
Net gain on disposals | 1.1 | 20.8 | 2.8 | 49.8
Stanmore Coal Limited [Member] |  |  |  |
Reportable segment results |  |  |  |
Net gain on disposals |  | 20.5 |  | 20.5
Iffley Land Transaction |  |  |  |
Reportable segment results |  |  |  |
Net gain on disposals |  |  |  | 20.6
Red Mountain Joint Venture |  |  |  |
Reportable segment results |  |  |  |
Net gain on disposals |  |  |  | 7.1
Seaborne Thermal Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 249.5 | 305.1 | 720.7 | 773.9
Total Adjusted EBITDA | 76.8 | 145.3 | 245.9 | 314.5
Seaborne Metallurgical Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 216.3 | 370.3 | 831.7 | 1,254.0
Total Adjusted EBITDA | (16.2) | 90.7 | 127.0 | 415.6
Powder River Basin Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 333.6 | 373.7 | 903.5 | 1,084.5
Total Adjusted EBITDA | 70.7 | 88.2 | 147.3 | 224.7
Midwestern U.S. Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 176.0 | 208.5 | 522.6 | 607.7
Total Adjusted EBITDA | 36.0 | 38.7 | 100.0 | 111.9
Western U.S. Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 150.4 | 156.1 | 448.2 | 439.4
Total Adjusted EBITDA | 46.3 | 28.5 | 141.3 | 94.4
Corporate and Other | Corporate, Non-Segment |  |  |  |
Reportable segment results |  |  |  |
Revenues | (19.4) | (1.1) | 79.3 | 25.2
Total Adjusted EBITDA | $ (63.3) | $ (19.3) | $ (129.3) | $ (55.5)

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