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Segment and Geographic Information Reconciliation of Assets by Segment to Consolidated Total Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Successor      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets $ 7,423.7 $ 8,181.2  
Property, plant, equipment and mine development, net 5,207.0 5,111.9  
Successor | U.S. Thermal Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 3,481.7 3,846.5  
Property, plant, equipment and mine development, net 3,180.4 3,361.0  
Successor | Seaborne Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 2,044.6 2,339.6  
Property, plant, equipment and mine development, net 1,661.3 1,501.7  
Successor | Corporate and Other      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 1,897.4 1,995.1  
Property, plant, equipment and mine development, net $ 365.3 $ 249.2  
Predecessor      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets     $ 11,777.7
Property, plant, equipment and mine development, net     8,776.7
Predecessor | U.S. Thermal Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets     4,255.9
Property, plant, equipment and mine development, net     3,970.6
Predecessor | Seaborne Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets     5,402.2
Property, plant, equipment and mine development, net     3,905.8
Predecessor | Corporate and Other      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets     2,119.6
Property, plant, equipment and mine development, net     $ 900.3