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Long-term Debt - Textuals (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 27 Months Ended
Apr. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Oct. 01, 2018
Aug. 09, 2018
USD ($)
Sep. 18, 2017
USD ($)
Apr. 03, 2017
USD ($)
Feb. 15, 2017
USD ($)
subsidiaries
Debt Instrument [Line Items]                        
Number of Subsidiaries | subsidiaries                       1
Debt issuance cost   $ 62,900,000   $ 62,900,000   $ 68,900,000 $ 62,900,000          
Interest expense   $ 36,000,000.0 $ 38,300,000 71,800,000 $ 74,600,000              
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security       $ 17,500,000 63,500,000              
Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Debt Instrument, Covenant, Fixed Charge Coverage Ratio   2.25                    
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%          
Debt Instrument, Restricted Payments, Amount Paid                 $ 10.00      
Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments                 1,000      
Long-term debt   $ 500,000,000.0   $ 500,000,000.0   $ 500,000,000.0 $ 500,000,000.0          
Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period One                        
Debt Instrument [Line Items]                        
Redemption price, percentage   103.00%                    
Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period Two                        
Debt Instrument [Line Items]                        
Redemption price, percentage   101.50%                    
Senior Notes | 6.000% Senior Secured Notes due March 2022 | Effect of Plan                        
Debt Instrument [Line Items]                        
Principal amount                       $ 500,000,000.0
Stated interest rate                       6.00%
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%          
Debt Instrument, Restricted Payments, Amount Paid                 30.00      
Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments                 1,000      
Long-term debt   $ 500,000,000.0   $ 500,000,000.0   $ 500,000,000.0 $ 500,000,000.0          
Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period One                        
Debt Instrument [Line Items]                        
Redemption price, percentage   104.80%                    
Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period Two                        
Debt Instrument [Line Items]                        
Redemption price, percentage   103.20%                    
Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period Three                        
Debt Instrument [Line Items]                        
Redemption price, percentage   101.60%                    
Senior Notes | 6.375% Senior Secured Notes due March 2025 | Effect of Plan                        
Debt Instrument [Line Items]                        
Principal amount                       $ 500,000,000.0
Stated interest rate                       6.375%
Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes                        
Debt Instrument [Line Items]                        
Debt issuance cost   $ 49,500,000   49,500,000     $ 49,500,000          
Interest expense   $ 18,600,000 17,500,000 $ 36,100,000 34,900,000              
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%          
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%          
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%          
Senior Notes | Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Debt Instrument, Restricted Payments Basket                 650,000,000.0      
Debt Instrument, Restricted Payments Basket, Annual Limit                 150,000,000.0      
Aggregate consent payments                 $ 19,800,000      
Other Expenses           1,500,000            
Term Loan | Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Principal amount   $ 400,000,000.0   $ 400,000,000.0     $ 400,000,000.0          
Interest expense   5,700,000 6,600,000 11,400,000 13,400,000              
Debt Instrument, Restricted Payments Basket                   $ 450,000,000.0    
Original issue discount and deferred finance costs   $ 37,300,000   $ 37,300,000     $ 37,300,000          
Debt Instrument, Principal Prepayment, Percent of Principal Amount if Repaid Before October 2018               101.00%        
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)   $ 10,000,000.0   $ 10,000,000.0     $ 10,000,000.0          
Repayments of Debt             555,000,000.0          
Payment for Debt Extinguishment or Debt Prepayment Cost             546,000,000.0          
Restricted payments threshold   $ 450,000,000.0   $ 450,000,000.0     $ 450,000,000.0     $ 50,000,000.0    
Debt Instrument, Covenant, Fixed Charge Coverage Ratio   2.00                    
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security $ 46,000,000.0                      
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%          
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          
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          
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%          
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          
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          
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          
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   $ 25,000,000.0   $ 25,000,000.0     $ 25,000,000.0          
Term Loan | Successor Credit Agreement | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   2.75%                    
Term Loan | Successor Credit Agreement | Effect of Plan                        
Debt Instrument [Line Items]                        
Principal amount                     $ 950,000,000.0  
Term Loan | Senior Secured Term Loan due 2025, net of original issue discount                        
Debt Instrument [Line Items]                        
Secured Debt   $ 950,000,000.0   950,000,000.0     950,000,000.0          
Long-term debt   394,000,000.0   394,000,000.0   $ 395,900,000 394,000,000.0          
Line of Credit | 2017 Revolver | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Long-term debt   350,000,000.0   350,000,000.0     350,000,000.0          
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Interest expense     $ 1,300,000                  
Revolving Credit Facility | 2017 Revolver                        
Debt Instrument [Line Items]                        
Debt issuance cost   4,700,000   4,700,000     4,700,000          
Interest expense   1,500,000   3,100,000 $ 3,100,000              
Line of Credit Facility, Maximum Borrowing Capacity   350,000,000.0   $ 350,000,000.0     $ 350,000,000.0          
Unrestricted Cash Netting Limit   $ 800,000,000.0                    
Revolving Credit Facility, Fee on Unused Borrowings   0.50%   0.50%     0.50%          
Aggregate Letters of Credit, Maximum   $ 70,800,000   $ 70,800,000     $ 70,800,000          
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   2.00     2.00          
Revolving Credit Facility | 2017 Revolver | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 2.75% 3.25%                    
London Interbank Offered Rate (LIBOR) Floor 1.00%                      
Revolving Credit Facility | Letter of Credit                        
Debt Instrument [Line Items]                        
Debt Instrument, Base Interest Rate   3.375%   3.375%     3.375%