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Long-term Debt - Textuals (Details)
3 Months Ended 6 Months Ended 9 Months Ended 18 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Apr. 01, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Aug. 09, 2018
USD ($)
Sep. 18, 2017
USD ($)
Jun. 30, 2017
USD ($)
Apr. 03, 2017
USD ($)
Feb. 15, 2017
USD ($)
Senior Notes | 6.000% Senior Secured Notes due March 2022                        
Debt Instrument [Line Items]                        
Debt Instrument, Restricted Payments, Amount Paid               $ 10.00        
Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments               1,000        
Senior Notes | 6.375% Senior Secured Notes due March 2025                        
Debt Instrument [Line Items]                        
Debt Instrument, Restricted Payments, Amount Paid               30.00        
Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments               1,000        
Senior Notes | Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Debt Instrument, Restricted Payments Basket               650,000,000        
Debt Instrument, Restricted Payments Basket, Annual Limit               150,000,000        
Other Expenses $ 1,500,000                      
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               $ 19,800,000 $ 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 71,900,000       71,900,000 $ 59,400,000 71,900,000          
Interest expense 38,200,000 $ 42,400,000   $ 83,800,000 112,800,000              
Capital lease obligations 51,100,000       51,100,000 76,000,000 $ 51,100,000          
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities       332,100,000 73,000,000              
Gain (Loss) on Extinguishment of Debt 0 $ (12,900,000)   (12,900,000) (2,000,000)              
Payments of Debt Issuance Costs       $ 6,100,000 21,200,000              
Successor | Revolving Credit Facility | 2017 Revolver                        
Debt Instrument [Line Items]                        
Debt issuance cost           4,700,000            
Interest expense $ 1,300,000       $ 4,300,000              
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           $ 104,400,000            
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 $ 19,100,000       $ 54,000,000   $ 30,600,000          
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 $ 5,100,000       $ 18,500,000   $ 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             $ 552,000,000          
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 $ 397,000,000       $ 397,000,000 444,200,000 $ 397,000,000          
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     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                  
Payments of Debt Issuance Costs     $ 45,400,000