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v3.20.4

Segment and Geographic Information - Segment Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 2,881.1 | $ 4,623.4 | $ 5,581.8
Adjusted EBITDA | 258.8 | 883.0 | 1,387.9
Additions to property, plant, equipment and mine development | 191.4 | 285.4 | 301.0
Federal Coal Lease Expenditures |  |  | 0.5
Loss (income) from equity affiliates | 60.1 | (3.4) | (68.1)
Seaborne Thermal Mining |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 711.8 | 971.7 | 1,099.2
Adjusted EBITDA | 163.2 | 329.4 | 452.0
Additions to property, plant, equipment and mine development | 100.7 | 42.1 | 66.6
Federal Coal Lease Expenditures |  |  | 0.0
Loss (income) from equity affiliates | 0.0 | 0.0 | 0.0
Seaborne Metallurgical Mining |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 486.5 | 1,033.1 | 1,553.0
Adjusted EBITDA | (130.2) | 140.2 | 441.4
Additions to property, plant, equipment and mine development | 50.8 | 143.4 | 88.7
Federal Coal Lease Expenditures |  |  | 0.0
Loss (income) from equity affiliates | 0.0 | 0.0 | 0.0
Powder River Basin Mining |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 991.1 | 1,228.7 | 1,424.8
Adjusted EBITDA | 194.8 | 221.2 | 284.5
Additions to property, plant, equipment and mine development | 13.2 | 42.8 | 81.0
Federal Coal Lease Expenditures |  |  | 0.0
Loss (income) from equity affiliates | 0.0 | 0.0 | 0.0
Other U.S. Thermal Mining |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 707.3 | 1,309.4 | 1,393.0
Adjusted EBITDA | 168.4 | 361.4 | 290.6
Additions to property, plant, equipment and mine development | 23.3 | 54.0 | 60.5
Federal Coal Lease Expenditures |  |  | 0.5
Loss (income) from equity affiliates | 0.0 | 0.0 | 0.0
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (15.6) | 80.5 | 111.8
Adjusted EBITDA | (137.4) | (169.2) | (80.6)
Additions to property, plant, equipment and mine development | 3.4 | 3.1 | 4.2
Federal Coal Lease Expenditures |  |  | 0.0
Loss (income) from equity affiliates | $ 60.1 | $ (3.4) | $ (68.1)

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