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Summary of Significant Accounting Policies (Details) - USD ($)
 1 Months Ended 2 Months Ended 12 Months Ended
Jan. 29, 2021
Dec. 31, 2019
Aug. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 06, 2020
Feb. 15, 2017
Summary of Significant Accounting Policies Textuals                
Contribution amount to co-issuers     $ 100,000,000.0          
Contribution to co-issuers, period with capital needs     12 months          
Capitalized debt issuance costs related to Refinancing Transactions       $ 7,000,000.0        
Gain on the settlement of claims           $ 12,800,000    
Income tax provision       $ 8,000,000.0 $ 46,000,000.0 18,400,000    
Accounts receivable, payment term       30 days        
Interest costs capitalized       $ 0 0 0    
Royalty Expense       $ 214,700,000 388,600,000 474,300,000    
Lease term       10 years        
Minimum annual production of federal coal mining leases on original amount       1.00%        
Monthly federal royalties payable from sale using surface mining methods       12.50%        
Monthly federal royalties payable of production using underground mining methods       8.00%        
Equity method investment       $ 0 0 0    
Impairment of investment in equity security       0 9,000,000.0 0    
Restructuring charges for voluntary and involuntary workforce reductions       37,900,000 24,300,000 1,200,000    
Restructuring charges       2,400,000        
Asset impairment charges related to long-lived assets       1,487,400,000 261,200,000 0    
Foreign currency remeasurement gain (loss)       (4,000,000.0) (2,700,000) 1,400,000    
Foreign currency translation adjustment       6,100,000 200,000 $ (5,900,000)    
Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Payment for debt exchange $ 9,400,000              
Payment for debt exchange early tender premiums 4,000,000.0              
Debt exchange offer, required purchase amount (up to) $ 22,500,000              
Debt exchange offer, required purchase, percentage of accreted value 80.00%              
Surety Bond                
Summary of Significant Accounting Policies Textuals                
Debt principal amount       $ 1,633,600,000        
Pro Forma                
Summary of Significant Accounting Policies Textuals                
Income tax provision   $ 38,000,000            
Surety Bond                
Summary of Significant Accounting Policies Textuals                
Transaction support agreements, additional collateral demands             $ 800,000,000  
Transaction support agreements, percentage of Participating Sureties             99.00%  
Transaction support agreements, additional collateral to be posted             $ 75,000,000.0  
Debt instrument, transaction support agreements, fair value of second liens on mining equipment             200,000,000.0  
Transaction support agreements, additional collateral to be posted per year through 2024             25,000,000.0  
Transaction support agreements, additional collateral term, free cash flow in any twelve-month period             100,000,000.0  
Transaction support agreements, additional collateral term, sale of assets benchmark (in excess of)             $ 10,000,000.0  
Senior Notes | 6.000% Senior Secured Notes due March 2022                
Summary of Significant Accounting Policies Textuals                
Stated interest rate       6.00%        
Debt principal amount               $ 500,000,000.0
Long-term debt   $ 459,000,000.0   $ 459,000,000.0 $ 459,000,000.0      
Senior Notes | 6.000% Senior Secured Notes due March 2022 | Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Aggregate principal amount of debt exchanged $ 398,700,000              
Long-term debt $ 60,300,000              
Senior Notes | 10.00% Senior Secured Notes Due 2024 (New Co-Issuer Notes) | Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Stated interest rate 10.00%              
Debt principal amount $ 193,900,000              
Senior Notes | 8.500% Senior Secured Notes due 2024 (New Peabody Notes) | Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Stated interest rate 8.50%              
Debt principal amount $ 195,100,000              
Senior Notes | New Co-Issuer Term Loans | Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Stated interest rate 10.00%              
Debt amount incurred $ 206,000,000.0              
Line of Credit | Revolving Credit Facility | Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Repayments of lines of credit 10,000,000.0              
Line of Credit | Letter of Credit | Subsequent Event                
Summary of Significant Accounting Policies Textuals                
Debt amount incurred $ 324,000,000.0              
Revolving credit facility, fee on unused borrowings 6.00%              
Commitment fee percentage 0.50%              
Debt covenant, aggregate liquidity at the end of each quarter $ 125,000,000.0              
Middlemount                
Summary of Significant Accounting Policies Textuals                
Ownership percentage of equity method investment       50.00%        
Minimum | Machinery and equipment                
Summary of Significant Accounting Policies Textuals                
Useful life       1 year        
Maximum | Buildings and improvements                
Summary of Significant Accounting Policies Textuals                
Useful life       32 years        
Maximum | Machinery and equipment                
Summary of Significant Accounting Policies Textuals                
Useful life       15 years