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Long-term Debt - Textuals (Details)
3 Months Ended 6 Months Ended 9 Months Ended 15 Months Ended
Apr. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Apr. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Sep. 18, 2017
USD ($)
Apr. 03, 2017
USD ($)
Feb. 15, 2017
USD ($)
Debt Instrument [Line Items]                    
Gain (Loss) on Extinguishment of Debt $ 0                  
Senior Notes | Effect of Plan | 6.000% Senior Secured Notes due March 2022                    
Debt Instrument [Line Items]                    
Principal amount                   $ 500,000,000.0
Senior Notes | Effect of Plan | 6.375% Senior Secured Notes due March 2025                    
Debt Instrument [Line Items]                    
Principal amount                   $ 500,000,000.0
Term Loan | Successor Credit Agreement                    
Debt Instrument [Line Items]                    
Restricted payments threshold           $ 450,000,000.0   $ 50,000,000.0    
Debt Instrument, Restricted Payments Basket               $ 450,000,000    
Debt Instrument, Covenant, Fixed Charge Coverage Ratio         2.25 2.00        
Term Loan | Successor Credit Agreement | Total Leverage Ration Less Or Equal 2.00 to 1.00                    
Debt Instrument [Line Items]                    
Total Leverage Ratio   2.00     2.00   2.00      
Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal 1.25 to 1.00                    
Debt Instrument [Line Items]                    
Total Leverage Ratio   1.25     1.25   1.25      
Dividend payment and stock purchase payment threshold   $ 25,000,000     $ 25,000,000   $ 25,000,000      
Term Loan | Effect of Plan | Successor Credit Agreement                    
Debt Instrument [Line Items]                    
Principal amount                 $ 950,000,000  
Successor                    
Debt Instrument [Line Items]                    
Debt issuance cost   54,400,000     54,400,000 $ 59,400,000 54,400,000      
Interest expense   38,300,000 $ 41,400,000   74,600,000          
Capital lease obligations   59,500,000     59,500,000 76,000,000 $ 59,500,000      
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities     23,800,000   63,500,000          
Gain (Loss) on Extinguishment of Debt   (2,000,000) 0   (2,000,000)          
Payments of Debt Issuance Costs     0   1,400,000          
Successor | Revolving Credit Facility | 2017 Revolver                    
Debt Instrument [Line Items]                    
Debt issuance cost           4,700,000        
Interest expense   $ 1,300,000     $ 3,100,000          
Line of Credit Facility, Maximum Borrowing Capacity           350,000,000        
Unrestricted Cash Netting Limit           800,000,000        
Revolving Credit Facility, Fee on Unused Borrowings   0.50%     0.50%   0.50%      
Aggregate Letters of Credit, Maximum           $ 129,800,000        
Successor | Revolving Credit Facility | 2017 Revolver | Total Leverage Ration Less Or Equal 2.00 to 1.00                    
Debt Instrument [Line Items]                    
Total Leverage Ratio           2.00        
Successor | Revolving Credit Facility | 2017 Revolver | London Interbank Offered Rate (LIBOR)                    
Debt Instrument [Line Items]                    
Basis spread on variable rate         2.75% 3.25%        
Successor | Revolving Credit Facility | Letter of Credit                    
Debt Instrument [Line Items]                    
Debt Instrument, Base Interest Rate           3.375%        
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022                    
Debt Instrument [Line Items]                    
Stated interest rate   6.00%     6.00% 6.00% 6.00%      
Long-term debt   $ 500,000,000     $ 500,000,000 $ 500,000,000 $ 500,000,000      
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period One                    
Debt Instrument [Line Items]                    
Redemption price, percentage         103.00%          
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period Two                    
Debt Instrument [Line Items]                    
Redemption price, percentage         101.50%          
Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025                    
Debt Instrument [Line Items]                    
Stated interest rate   6.375%     6.375% 6.375% 6.375%      
Long-term debt   $ 500,000,000     $ 500,000,000 $ 500,000,000 $ 500,000,000      
Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period One                    
Debt Instrument [Line Items]                    
Redemption price, percentage         104.80%          
Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period Two                    
Debt Instrument [Line Items]                    
Redemption price, percentage         103.20%          
Successor | Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period Three                    
Debt Instrument [Line Items]                    
Redemption price, percentage         101.60%          
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes                    
Debt Instrument [Line Items]                    
Debt issuance cost     49,500,000              
Interest expense   $ 17,500,000     $ 34,900,000   $ 15,100,000      
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes | Domestic                    
Debt Instrument [Line Items]                    
Collateral, capital stock, percent   100.00%     100.00%   100.00%      
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes | Export                    
Debt Instrument [Line Items]                    
Collateral, non-voting capital stock, percent   100.00%     100.00%   100.00%      
Collateral, voting capital stock, percent   65.00%     65.00%   65.00%      
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes | Peabody Investments (Gibraltar) Limited                    
Debt Instrument [Line Items]                    
Collateral, non-voting capital stock, percent   100.00%     100.00%   100.00%      
Collateral, voting capital stock, percent   65.00%     65.00%   65.00%      
Successor | Term Loan | Successor Credit Agreement                    
Debt Instrument [Line Items]                    
Interest expense   $ 6,600,000     $ 13,400,000   $ 13,100,000      
Principal amount     400,000,000              
Original issue discount and deferred finance costs     $ 37,300,000              
Mandatory principal prepayment, percent of excess cash flow   75.00%     75.00%   75.00%      
Mandatory principal prepayment, if required, period payable, threshold         100 days          
Excess proceeds from sales of assets, threshold ($10 million or greater)   $ 10,000,000     $ 10,000,000   $ 10,000,000      
Payment for Debt Extinguishment or Debt Prepayment Cost             $ 546,000,000      
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities   46,000,000                
Gain (Loss) on Extinguishment of Debt   (2,000,000)                
Payments of Debt Issuance Costs   1,000,000                
Other Expenses   $ 900,000                
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00                    
Debt Instrument [Line Items]                    
Mandatory principal prepayment, percent of excess cash flow   50.00%     50.00%   50.00%      
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Maximum                    
Debt Instrument [Line Items]                    
Total Leverage Ratio   2.00     2.00   2.00      
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Minimum                    
Debt Instrument [Line Items]                    
Total Leverage Ratio   1.50     1.50   1.50      
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00                    
Debt Instrument [Line Items]                    
Mandatory principal prepayment, percent of excess cash flow   25.00%     25.00%   25.00%      
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Maximum                    
Debt Instrument [Line Items]                    
Total Leverage Ratio   1.50     1.50   1.50      
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Minimum                    
Debt Instrument [Line Items]                    
Total Leverage Ratio   1.00     1.00   1.00      
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.00 to 1.00                    
Debt Instrument [Line Items]                    
Mandatory principal prepayment, percent of excess cash flow   0.00%     0.00%   0.00%      
Total Leverage Ratio   1.00     1.00   1.00      
Successor | Term Loan | Successor Credit Agreement | London Interbank Offered Rate (LIBOR)                    
Debt Instrument [Line Items]                    
Basis spread on variable rate         2.75%          
Successor | Term Loan | Senior Secured Term Loan due 2025, net of original issue discount                    
Debt Instrument [Line Items]                    
Long-term debt   $ 397,900,000     $ 397,900,000 444,200,000 $ 397,900,000      
Secured Debt           950,000,000.0        
Successor | Line of Credit | 2017 Revolver | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Long-term debt           $ 350,000,000        
Predecessor                    
Debt Instrument [Line Items]                    
Interest expense, adequate protection payments       $ 29,800,000            
Contractual interest expense       92,900,000            
Interest expense 0     32,900,000            
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities       2,100,000            
Gain (Loss) on Extinguishment of Debt $ 0     0            
Payments of Debt Issuance Costs       $ 45,400,000