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Long-term Debt - Textuals (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 18 Months Ended |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |

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- Definition Amount represents the maximum face amount of all letters of credit issued under the L/C Facility and the Bonding L/C Facility without DIP Lender consent. + References No definition available. + Details
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- Definition Debt Instrument, Restricted Payments Basket, Annual Limit + References No definition available. + Details
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- Definition Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments + References No definition available. + Details
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