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Segment Information Segment Results (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reportable segment results |  |  |  |
Revenues | $ 626.7 | $ 1,149.0 | $ 1,472.9 | $ 2,399.6
Adjusted EBITDA | 23.4 | 230.0 | 60.2 | 484.1
Seaborne Thermal Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 162.0 | 220.2 | 363.1 | 471.2
Adjusted EBITDA | 27.7 | 74.4 | 82.8 | 169.1
Seaborne Metallurgical Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 91.6 | 290.9 | 284.8 | 615.4
Adjusted EBITDA | (36.1) | 57.4 | (68.8) | 143.2
Powder River Basin Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 205.8 | 282.6 | 472.4 | 569.9
Adjusted EBITDA | 39.3 | 40.2 | 64.7 | 76.6
Other U.S. Thermal Mining | Operating Segments |  |  |  |
Reportable segment results |  |  |  |
Revenues | 152.0 | 309.6 | 344.3 | 644.4
Adjusted EBITDA | 32.9 | 83.1 | 71.4 | 159.0
Corporate and Other | Corporate, Non-Segment |  |  |  |
Reportable segment results |  |  |  |
Revenues | 15.3 | 45.7 | 8.3 | 98.7
Adjusted EBITDA | $ (40.4) | $ (25.1) | $ (89.9) | $ (63.8)

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