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Segment Information Segment Results (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reportable segment results |  |  |  |
Revenues | $ 1,149.0 | $ 1,309.4 | $ 2,399.6 | $ 2,772.1
Total Adjusted EBITDA | 228.0 | 369.6 | 481.9 | 733.5
Net gain on disposals | 0.2 | (1.6) | 1.7 | 29.0
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 | 220.2 | 267.4 | 471.2 | 468.8
Total Adjusted EBITDA | 74.4 | 107.6 | 169.1 | 169.2
Seaborne Metallurgical Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 290.9 | 417.5 | 615.4 | 883.7
Total Adjusted EBITDA | 57.4 | 158.5 | 143.2 | 324.9
Powder River Basin Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 282.6 | 321.5 | 569.9 | 710.8
Total Adjusted EBITDA | 40.2 | 62.0 | 76.6 | 136.5
Midwestern U.S. Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 167.5 | 197.5 | 346.6 | 399.2
Total Adjusted EBITDA | 30.7 | 42.0 | 64.0 | 73.2
Western U.S. Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 142.1 | 139.6 | 297.8 | 283.3
Total Adjusted EBITDA | 52.4 | 33.9 | 95.0 | 65.9
Corporate and Other | Corporate, Non-Segment |  |  |  |
Reportable segment results |  |  |  |
Revenues | 45.7 | (34.1) | 98.7 | 26.3
Total Adjusted EBITDA | $ (27.1) | $ (34.4) | $ (66.0) | $ (36.2)

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