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Discontinued Operations Textuals (Details)
AUD in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Apr. 01, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
AUD
Oct. 31, 2007
USD ($)
Predecessor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Potential exposure from Patriot bankruptcy                   $ 150.0
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net   $ 0.0         $ 0.0 $ 0.0    
Estimated fund obligation                   $ 40.0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax   $ (16.2)         (57.6) (182.2)    
Amount paid to the Combined Benefit Fund   0.6                
Combined Benefit Fund Lower Estimate           $ 2.0        
Combined Benefit Fund Future Estimate           $ 3.0        
Liability related to Combined Benefit Fund           20.2        
Payment to the VEBA based on the construct of the negotiated settlement               75.0    
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest   $ (16.2) $ 13.1 $ 38.1     (57.6) (175.0)    
Successor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Liability recorded related to Patriot Bankruptcy         134.0          
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net $ 45.2       $ (45.2)          
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax         $ (19.8)          
Amount paid to the Combined Benefit Fund         1.7          
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest         $ (19.8)          
Wilkie Creek [Member] | Predecessor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Loss Contingency, Loss in Period               9.7    
Settlement charges total       $ 9.9         AUD 13.0  
Combined benefit fund [Member] | Predecessor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax   $ 0.2         $ 1.2 $ 24.6    
Combined benefit fund [Member] | Successor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax         0.6          
Patriot Coal Corporation [Member] | Successor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net         7.9          
United Mine Workers of America [Member] | Predecessor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest     $ 54.3              
United Mine Workers of America [Member] | Successor                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest         $ 46.0