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Segment Information Segment Results (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reportable segment results |  |
Revenues | $ 846.2 | $ 1,250.6
Total Adjusted EBITDA | 36.8 | 254.1
Seaborne Thermal Mining | Operating Segments |  |
Reportable segment results |  |
Revenues | 201.1 | 251.0
Total Adjusted EBITDA | 55.1 | 94.7
Seaborne Metallurgical Mining | Operating Segments |  |
Reportable segment results |  |
Revenues | 193.2 | 324.5
Total Adjusted EBITDA | (32.7) | 85.8
Powder River Basin Mining | Operating Segments |  |
Reportable segment results |  |
Revenues | 266.6 | 287.3
Total Adjusted EBITDA | 25.4 | 36.4
Other U.S. Thermal Mining | Operating Segments |  |
Reportable segment results |  |
Revenues | 192.3 | 334.8
Total Adjusted EBITDA | 38.5 | 75.9
Corporate and Other | Corporate, Non-Segment |  |
Reportable segment results |  |
Revenues | (7.0) | 53.0
Total Adjusted EBITDA | $ (49.5) | $ (38.7)

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