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Segment and Geographic Information Reconciliation of Assets by Segment to Consolidated Total Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 6,542.8 | $ 7,423.7 | $ 8,181.2
Property, plant, equipment and mine development, net | 4,679.1 | 5,207.0 | 5,111.9
Operating lease right-of-use assets | 82.4 | 0.0 |
Seaborne Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 2,001.3 | 2,044.6 | 2,339.6
Property, plant, equipment and mine development, net | 1,610.9 | 1,661.3 | 1,501.7
Operating lease right-of-use assets | 32.1 |  |
U.S. Thermal Mining |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 3,044.8 | 3,481.7 | 3,846.5
Property, plant, equipment and mine development, net | 2,776.9 | 3,180.4 | 3,361.0
Operating lease right-of-use assets | 30.3 |  |
Corporate and Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,496.7 | 1,897.4 | 1,995.1
Property, plant, equipment and mine development, net | 291.3 | $ 365.3 | $ 249.2
Operating lease right-of-use assets | $ 20.0 |  |

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