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Long-term Debt - Textuals (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 39 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Sep. 30, 2023 | Nov. 30, 2020 | Sep. 30, 2019 | Oct. 01, 2018 | Aug. 09, 2018 | Dec. 31, 2017 | Sep. 18, 2017 | Apr. 03, 2017 | Feb. 15, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost | $ 49,100,000 | $ 55,500,000 |  |  | $ 49,100,000 |  |  | $ 49,100,000 |  |  |  |  |  |  |  |  |
Interest expense | 34,300,000 |  | $ 36,000,000.0 |  | 67,400,000 | $ 71,800,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit | 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 77,600,000 | 543,600,000 |  |  | 77,600,000 |  |  | $ 77,600,000 |  |  |  |  |  |  |  |  |
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security |  |  |  |  | $ 9,900,000 | 17,500,000 |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 459,000,000.0 | $ 459,000,000.0 |  |  | $ 459,000,000.0 |  |  | $ 459,000,000.0 |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  | 41,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Repurchase Amount, excluding interest |  | 39,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage | 103.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 | Debt Instrument, Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Interest expense | $ 17,500,000 |  | 18,600,000 |  | $ 35,000,000.0 | 36,100,000 |  |  |  |  |  |  |  |  |  |  |
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 | $ 3,800,000 |  | 5,700,000 |  | $ 8,700,000 | 11,400,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Restricted Payments Basket |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |  |
Basis spread on variable rate |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Floor Interest Rate | 1.00% |  |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  |  |  |  |
Original issue discount and deferred finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  | $ 46,000,000.0 |  |  |  | 559,000,000.0 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 2.92% |  |  |  |  |  |  |  |  |  |  |  |
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 |
Long-term debt | 390,100,000 | 392,100,000 |  |  | $ 390,100,000 |  |  | 390,100,000 |  |  |  |  |  |  |  |  |
Line of Credit | 2017 Revolver | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 300,000,000.0 | $ 0 |  |  | 300,000,000.0 |  |  | 300,000,000.0 |  |  |  |  |  |  | $ 350,000,000.0 |  |
Revolving Credit Facility | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  | $ 5,700,000 |  |  | $ 4,700,000 |  |  |
Interest expense | 4,000,000.0 |  | $ 1,500,000 |  | 5,700,000 | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit | 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 67,100,000 |  |  |  | 67,100,000 |  |  | 67,100,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 565,000,000.0 |  |  |  | 565,000,000.0 |  |  | 565,000,000.0 |  |  |  |  |  | $ 350,000,000.0 |  |  |
2019 Revolver commitments, matures 2023 | 540,000,000.0 |  |  |  | $ 540,000,000.0 |  |  | $ 540,000,000.0 |  |  |  |  |  |  |  |  |
Unrestricted Cash Netting Limit | $ 800,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Base Interest Rate | 3.125% |  |  |  | 3.125% |  |  | 3.125% |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Fee on Unused Borrowings | 0.40% |  |  |  | 0.40% |  |  | 0.40% |  |  |  |  |  |  |  |  |
Aggregate Letters of Credit, Maximum | $ 197,900,000 |  |  |  | $ 197,900,000 |  |  | $ 197,900,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Revolving Credit Facility | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Revolver commitments, matures 2023 |  |  |  |  |  |  |  |  | $ 540,000,000.0 |  |  |  |  |  |  |  |
2019 Revolver commitments, matures 2020 |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |

X
- Definition Portion of the 2019 Revolver commitments which matures in 2020 + References No definition available. + Details
Name: | btu_A2019Revolvercommitmentsmatures2020
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Portion of the 2019 Revolver commitments which matures in 2023 + References No definition available. + Details
Name: | btu_A2019Revolvercommitmentsmatures2023
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | btu_AggregateLettersofCreditMaximum
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate consent payments + References No definition available. + Details
Name: | btu_Aggregateconsentpayments
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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