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Discontinued Operations Textuals (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2007
Successor                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Disposal Group, Including Discontinued Operation, Revenue         $ 0 $ 0      
Patriot Bankruptcy Liability $ 102,700,000 $ 134,000,000     134,000,000 102,700,000      
Net mark-to-market adjustment on actuarially determined liabilities 125,500,000 45,200,000     (45,200,000) (125,500,000)      
Amount contributed to the Combined Benefit Fund         1,700,000 2,200,000      
Combined Benefit Fund Lower Estimate           1,000,000      
Combined Benefit Fund Future Estimate           2,000,000      
Combined Benefit Fund Liability $ 16,400,000 $ 20,200,000     20,200,000 16,400,000      
Income (loss) from discontinued operations, net of income taxes         (19,800,000) 18,100,000      
Successor | Combined benefit fund                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Loss from discontinued operations before income taxes         600,000 700,000      
Successor | Patriot Coal Corporation                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Net mark-to-market adjustment on actuarially determined liabilities         7,900,000 33,700,000      
Successor | United Mine Workers of America                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Income (loss) from discontinued operations, net of income taxes         $ 46,000,000 $ 36,700,000      
Predecessor                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Disposal Group, Including Discontinued Operation, Revenue     $ 0       $ 0    
Potential exposure from Patriot bankruptcy                 $ 150,000,000
Net mark-to-market adjustment on actuarially determined liabilities     0       0    
Estimated fund obligation                 $ 40,000,000
Amount contributed to the Combined Benefit Fund     600,000            
Payment to the VEBA based on the construct of the negotiated settlement               $ 75,000,000  
Income (loss) from discontinued operations, net of income taxes     (16,200,000)       (57,600,000)    
Predecessor | Combined benefit fund                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Loss from discontinued operations before income taxes     $ 200,000       $ 1,200,000    
Predecessor | United Mine Workers of America                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Income (loss) from discontinued operations, net of income taxes       $ 54,300,000