XML 126 R79.htm IDEA: XBRL DOCUMENT
v3.22.4

Long-term Debt - Textual (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2023 | Mar. 07, 2022 | Jan. 29, 2021 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Mar. 01, 2025 | Mar. 31, 2022 | Mar. 01, 2022 | Feb. 24, 2022 | Jan. 31, 2022 | Mar. 31, 2021 | Apr. 03, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  | $ 9,800,000 |  | $ 9,800,000 | $ 34,800,000 |  | $ 9,800,000 |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 140,300,000 | 183,400,000 | $ 139,800,000 |  |  |  |  |  |  |  |
Financial Assurance Instruments |  |  |  |  |  | 53,300,000 | 51,100,000 | 35,400,000 |  |  |  |  |  |  |  |
Net loss (gain) on early debt extinguishment |  |  |  |  |  | $ (57,900,000) | $ 33,200,000 | 0 |  |  |  |  |  |  |  |
Common Stock, shares authorized (in shares) |  |  |  | 450,000,000.0 |  | 450,000,000.0 | 450,000,000.0 |  | 450,000,000.0 |  |  |  |  |  |  |
Common Stock, shares issued (in shares) |  |  |  | 187,100,000 |  | 187,100,000 | 176,300,000 |  | 187,100,000 |  |  |  |  |  |  |
Payment for debt exchange |  |  | $ 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  |  |  | $ 222,000,000.0 | $ 269,800,000 | $ 0 |  |  |  |  |  |  |  |
Revolving Loans |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized (in shares) |  |  |  | 450,000,000 |  | 450,000,000 |  |  | 450,000,000 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.98 |  |  |
At Market Issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized (in shares) |  |  |  |  |  |  | 32,500,000 |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  |  |  | 24,800,000 |  |  |  |  |  |  |  |  |
Common Stock, shares issued (in shares) |  |  |  | 10,100,000 |  | 10,100,000 | 24,800,000 | 0 | 10,100,000 |  |  |  |  |  |  |
At Market Issuance | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
At Market Issuance | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  |  |  |  | $ 269,800,000 |  |  |  |  |  |  |  |  |
Open Market Purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  |  | $ 232,400,000 |  |  |  |  |  |  |  |  |
Debt for Equity Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares issued (in shares) |  |  |  | 0 |  | 0 | 10,000,000 | 0 | 0 |  |  |  |  |  |  |
6.375% Senior Secured Notes due March 2025 (2025 Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Exchange Offer, Percent of Accreted Value |  |  |  |  | 98.00% | 101.59% |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  | $ 7,000,000 |  | $ 7,000,000 |  |  | $ 7,000,000 |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  | $ 250,000,000
Accounts Receivable Securitization Program, April 3, 2020 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
10.00% Revolving Credit Facility maturing 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 225,000,000 |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  |  | $ 222,000,000 |  |  |  |  |  |  |  |  |  |
10.00% Revolving Credit Facility maturing 2025 | At Market Issuance | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  |  | 10,100,000 |  |  |  |  |  |  |  |  |  |
LC Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Exchange Offer, Percent of Accreted Value |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |
Cash Collateral Posted |  |  |  |  |  | $ 40,100,000 |  |  |  |  |  |  |  |  |  |
10.000% Senior Secured Notes due December 2024 and Senior Secured Term Loan due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |
Debt covenant, liquidity attributable to co-issuers limit (minimum) |  |  |  | 60,000,000 |  | 60,000,000 |  |  | 60,000,000 |  |  |  |  |  |  |
Debt Repurchase, Aggregate Cost |  |  |  |  |  | 32,800,000 |  |  |  |  |  |  |  |  |  |
3.250% Convertible Senior Notes due March 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, If-converted Value in Excess of Principal |  |  |  | 105,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes and Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) on early debt extinguishment |  |  |  |  |  | 34,900,000 |  |  |  |  |  |  |  |  |  |
8.500% Senior Secured Notes due December 2024 and 6.375% Senior Secured Notes due March 2025 [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) on early debt extinguishment |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.000% Senior Secured Notes due March 2022 (2022 Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  | $ 0 | $ 23,100,000 |  | $ 0 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.00% |  | 6.00% |  |  | 6.00% |  |  |  |  |  |  |
Aggregate principal amount of debt exchanged |  |  | 398,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchase, amount |  |  |  |  |  | $ 23,100,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.000% Senior Secured Notes due March 2022 (2022 Notes) | Debt for Equity Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  |  |  |  | 37,300,000 |  |  |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  | $ 0 | 334,900,000 |  | $ 0 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.375% |  | 6.375% |  |  | 6.375% |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  | $ 66,100,000 |  |  |  |  |  |  |  |  |  |
Debt repurchase, amount |  |  |  |  |  | 257,400,000 |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  | $ 11,400,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes) | Open Market Purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of Debt |  |  |  |  |  |  | 117,800,000 |  |  |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes) | Debt for Equity Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  |  |  |  | 47,200,000 |  |  |  |  |  |  |  |  |
Senior Notes | 10.00% Senior Secured Notes Due 2024 (New Co-Issuer Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  | 193,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 10.00% |  | 10.00% |  |  | 10.00% |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  | $ 0 | 193,900,000 |  | $ 0 |  |  |  |  |  |  |
Debt exchange offer, required purchase amount (up to) |  |  |  | $ 147,300,000 |  | 147,300,000 |  |  | $ 147,300,000 |  |  |  |  |  |  |
Debt Repurchase, Aggregate Cost |  |  |  |  |  | 154,100,000 |  |  |  |  |  |  |  |  |  |
Debt Repurchase, mandatory prepayment, aggregate cost |  |  |  |  |  | $ 19,200,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 8.500% Senior Secured Notes due 2024 (New Peabody Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  | 195,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 8.50% |  | 8.50% |  |  | 8.50% |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  | $ 0 | 62,600,000 |  | $ 0 |  |  |  |  |  |  |
Debt exchange offer, required purchase amount (up to) |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  | $ 22,400,000 |
Debt exchange offer, required purchase, percentage of accreted value |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  | 80.00% |
Debt repurchase, amount |  |  |  |  |  | $ 62,500,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 8.500% Senior Secured Notes due 2024 (New Peabody Notes) | Open Market Purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of Debt |  |  |  |  |  |  | 91,400,000 |  |  |  |  |  |  |  |  |
Senior Notes | 8.500% Senior Secured Notes due 2024 (New Peabody Notes) | Debt for Equity Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  |  |  |  | 21,600,000 |  |  |  |  |  |  |  |  |
Senior Notes | 10.00% Revolving Credit Facility maturing 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 10.00% |  | 10.00% |  |  | 10.00% |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | LC Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchase, amount |  |  |  |  |  | $ 42,200,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 10.000% Senior Secured Notes due December 2024 and Senior Secured Term Loan due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  | $ 28,100,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 3.250% Convertible Senior Notes due March 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  | $ 320,000,000 | $ 320,000,000 |  |  |  |
Stated interest rate |  |  |  | 3.25% |  | 3.25% |  |  | 3.25% |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 320,000,000.0 |  | $ 320,000,000.0 | 0 |  | $ 320,000,000.0 |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  | $ 11,200,000 |  | $ 11,200,000 |  |  | $ 11,200,000 |  |  |  |  |  |  |
Common Stock, Excess of the Conversion Price, Percentage |  |  |  | 130.00% |  | 130.00% |  |  | 130.00% |  |  |  |  |  |  |
Principle Amount, Percentage |  |  |  | 98.00% |  | 98.00% |  |  | 98.00% |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  | 50.3816 |  | 50.3816 |  |  | 50.3816 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  | $ 19.85 |  | $ 19.85 |  |  | $ 19.85 |  |  |  |  |  |  |
Conversion Price Premium, Percent |  |  |  |  |  |  |  |  |  |  |  |  | 32.50% |  |  |
Senior Notes | 3.250% Convertible Senior Notes due March 2028 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle Amount, Percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Aggregate Principle Amount, Notes Outstanding |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  |  |
Term Loan | Senior Secured Term Loan Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amount incurred |  |  | 206,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  | 0 | 206,000,000.0 |  | $ 0 |  |  |  |  |  |  |
Debt exchange offer, required purchase amount (up to) |  |  |  | $ 185,900,000 |  | 185,900,000 |  |  | $ 185,900,000 |  |  |  |  |  |  |
Debt Repurchase, Aggregate Cost |  |  |  |  |  | 195,800,000 |  |  |  |  |  |  |  |  |  |
Debt Repurchase, mandatory prepayment, aggregate cost |  |  |  |  |  | 17,200,000 |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Term Loan Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  | 276,200,000 |  |  |  |  |  |  |  |  |  |
Debt repurchase, amount |  |  |  |  |  | 44,100,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |
Debt Repurchase, Aggregate Cost |  |  |  |  |  | $ 42,100,000 |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Term Loan Due 2025 | Open Market Purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of Debt |  |  |  |  |  |  | 61,700,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Of Debt |  |  |  |  |  |  | $ 216,000,000 |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt secured liens term, percentage of capital stock |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.75% |  | 0.75% |  |  | 0.75% |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  | $ 250,000,000 |  |  |  |  |  |  |
Letter of Credit | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amount incurred |  |  | 324,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 125,000,000 |  | $ 125,000,000 |  |  | $ 125,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net |  |  |  |  |  | (22,000,000) |  |  |  |  |  |  |  |  |  |
Payments to Acquire Restricted Investments |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |
Letter of Credit | Line of Credit | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net | $ (65,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Minimum | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net |  |  |  |  |  | $ (10,000,000) |  |  |  |  |  |  |  |  |  |

X
- Definition Aggregate Principle Amount, Notes Outstanding + References No definition available. + Details
Name: | btu_AggregatePrincipleAmountNotesOutstanding
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash Collateral Posted + References No definition available. + Details
Name: | btu_CashCollateralPosted
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Common Stock, Excess of the Conversion Price, Percentage + References No definition available. + Details
Name: | btu_CommonStockExcessOfTheConversionPricePercentage
Namespace Prefix: | btu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Conversion Price Premium, Percent + References No definition available. + Details
Name: | btu_ConversionPricePremiumPercent
Namespace Prefix: | btu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Convertible, Conversion Ratio + References No definition available. + Details
Name: | btu_DebtInstrumentConvertibleConversionRatio
Namespace Prefix: | btu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Aggregate Liquidity At End Of Each Quarter + References No definition available. + Details
Name: | btu_DebtInstrumentCovenantAggregateLiquidityAtEndOfEachQuarter
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Liquidity Attributable To Co-Issuers + References No definition available. + Details
Name: | btu_DebtInstrumentCovenantLiquidityAttributableToCoIssuers
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Instrument, Exchange Offer, Percent of Accreted Value + References No definition available. + Details
Name: | btu_DebtInstrumentExchangeOfferPercentOfAccretedValue
Namespace Prefix: | btu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Exchange Offer, Required Purchase Amount + References No definition available. + Details
Name: | btu_DebtInstrumentExchangeOfferRequiredPurchaseAmount
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Exchange Offer, Required Purchase, Percentage Of Accreted Value + References No definition available. + Details
Name: | btu_DebtInstrumentExchangeOfferRequiredPurchasePercentageOfAccretedValue
Namespace Prefix: | btu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument Exchanged, Aggregate Principal Amount + References No definition available. + Details
Name: | btu_DebtInstrumentExchangedAggregatePrincipalAmount
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Secured Liens Term, Percentage Of Capital Stock + References No definition available. + Details
Name: | btu_DebtInstrumentSecuredLiensTermPercentageOfCapitalStock
Namespace Prefix: | btu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Repurchase, Aggregate Cost + References No definition available. + Details
Name: | btu_DebtRepurchaseAggregateCost
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt repurchase, amount + References No definition available. + Details
Name: | btu_DebtRepurchaseAmount
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Debt Repurchase, mandatory prepayment, aggregate cost + References No definition available. + Details
Name: | btu_DebtRepurchaseMandatoryPrepaymentAggregateCost
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financial Assurance Instruments + References No definition available. + Details
Name: | btu_FinancialAssuranceInstruments
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payment For Debt Exchange + References No definition available. + Details
Name: | btu_PaymentForDebtExchange
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Principle Amount, Percentage + References No definition available. + Details
Name: | btu_PrincipleAmountPercentage
Namespace Prefix: | btu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Restructuring Of Debt + References No definition available. + Details
Name: | btu_RestructuringOfDebt
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Retirement of Debt + References No definition available. + Details
Name: | btu_RetirementOfDebt
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revolving Loans + References No definition available. + Details
Name: | btu_RevolvingLoans
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireRestrictedInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=btu_AtMarketIssuanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=btu_OpenMarketPurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=btu_DebtForEquityExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A6.375SeniorSecuredNotesDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_AccountsReceivableSecuritizationProgramApril32020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A1000RevolvingCreditFacilityMaturing2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_LCAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A10000SeniorSecuredNotesDueDecember2024AndSeniorSecuredTermLoanDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A3250ConvertibleSeniorNotesDueMarch2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_SeniorNotesAndTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A8500SeniorSecuredNotesDueDecember2024And6375SeniorSecuredNotesDueMarch2025Domain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A6.000SeniorSecuredNotesDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A1000SeniorSecuredNotesDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_A8500SeniorSecuredNotesDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=btu_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_SeniorSecuredTermLoanDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=btu_SeniorSecuredTermLoanDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |