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Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions
Apr. 01, 2017
Dec. 31, 2017
Jun. 30, 2017
Apr. 03, 2017
Mar. 31, 2017
Feb. 15, 2017
Dec. 31, 2016
Dec. 31, 2015
Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Common stock, shares issued (in shares)   130.7            
Assets held-for-sale         $ 228,500,000      
Write off of mine development costs $ 89,500,000              
Write off of prepaid assets $ 15,000,000              
Successor                
Fresh-Start Adjustment [Line Items]                
Common stock, shares outstanding (in shares) 70.9 105.2            
Postconfirmation, preferred stock $ 1,305,400,000              
Postconfirmation, total stockholders' equity 3,131,900,000              
Postconfirmation, long-term debt 1,853,700,000              
Debt issuance cost   $ 59,400,000         $ 70,800,000  
Successor | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Final equity value $ 3,081,000,000              
Postconfirmation, common stock, share price (in dollars per share) $ 22.03              
Common stock, shares issued (in shares) 70.9              
Common stock, par value per share (in dollars per share) $ 0.01              
Postconfirmation, preferred stock $ 750,000,000              
Discount percent of common stock value 35.00%              
Postconfirmation, common stock, initial share price estimate $ 25.00              
Dividends, common stock, paid in kind, guaranteed period 3 years              
Dividends, common stock, paid in kind, annual stated rate 8.50%              
Convertible preferred stock, shares issued upon conversion 46.2              
Equity ownership percent 42.00%              
Postconfirmation, total stockholders' equity $ 3,105,000,000              
Convertible preferred stock, converted shares, fair value $ 1,305,400,000              
Discount rate 4.10%           4.15%  
Remeasurement reduction in pension liabilities $ 9,200,000              
Predecessor                
Fresh-Start Adjustment [Line Items]                
Credit adjusted risk free interest rates               50.83%
2017 Incentive Plan | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Common stock reserved for future issuance 14.0              
Incentive plan expiration period 10 years              
Common stock, shares issued (in shares)   3.5            
2017 Incentive Plan | Predecessor | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Common stock reserved for future issuance 14.0              
Minimum | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Final equity value $ 4,200,000,000              
Discounted cash flow, estimated weighed average cost of capital, percent 11.00%              
Maximum | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Final equity value $ 4,900,000,000              
Discounted cash flow, estimated weighed average cost of capital, percent 14.50%              
Restricted Stock | 2017 Incentive Plan | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Fair value of stock granted $ 80,000,000              
Paid In Kind | Successor | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Convertible preferred stock, shares issued upon conversion 13.1              
Successor Credit Agreement | Term Loan | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Principal amount       $ 950,000,000        
Successor Credit Agreement | Term Loan | Successor                
Fresh-Start Adjustment [Line Items]                
Principal amount     $ 450,000,000          
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Principal amount           $ 500,000,000.0    
6.375% Senior Secured Notes due March 2025 | Senior Notes | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Principal amount           $ 500,000,000.0    
Senior Secured Term Loan | Term Loan | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Postconfirmation, long-term debt $ 950,000,000              
Debt issuance cost 37,300,000              
Successor Notes | Senior Notes | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Debt issuance cost 49,500,000              
Principal amount 1,000,000,000.0              
Coal supply agreements | Successor | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Finite-lived intangible assets, fair value $ 314,900,000              
Useful life 3 years              
Finite-lived intangible assets, fair value, noncurrent $ 58,700,000              
Port And Rail Take Or Pay Contracts | Successor | Effect of Plan                
Fresh-Start Adjustment [Line Items]                
Finite-lived intangible assets, fair value 32,600,000              
Liabilities, held-for-sale         $ 15,700,000      
Finite-lived intangible assets, fair value, noncurrent $ 83,600,000              
U.S. Obligations [Member] | Successor                
Fresh-Start Adjustment [Line Items]                
Credit adjusted risk free interest rates   9.71%            
U.S. Obligations [Member] | Predecessor                
Fresh-Start Adjustment [Line Items]                
Credit adjusted risk free interest rates 9.36%           13.45%  
Australian Operations [Member] | Successor                
Fresh-Start Adjustment [Line Items]                
Credit adjusted risk free interest rates   4.65%            
Australian Operations [Member] | Predecessor                
Fresh-Start Adjustment [Line Items]                
Credit adjusted risk free interest rates 4.36%           4.92%