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Long-term Debt - Textual (Details) |  |  |  | 3 Months Ended | 11 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 21, 2024 | Feb. 03, 2023 | Mar. 07, 2022 USD ($) | Dec. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) shares | Dec. 31, 2024 | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Mar. 01, 2025 USD ($) | Jan. 18, 2024 USD ($) | Mar. 01, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  | $ 8,100,000 |  |  | $ 8,100,000 | $ 9,800,000 |  |  |  |
Interest expense |  |  |  |  |  |  | 59,800,000 | 140,300,000 | $ 183,400,000 |  |  |
Financial Assurance Instruments |  |  |  |  |  |  | 38,200,000 | 53,300,000 | 51,100,000 |  |  |
Net loss (gain) on early debt extinguishment |  |  |  |  |  |  | $ (8,800,000) | $ (57,900,000) | 33,200,000 |  |  |
Common Stock, shares authorized (in shares) | shares |  |  |  | 450,000,000.0 |  |  | 450,000,000.0 | 450,000,000.0 |  |  |  |
Common Stock, shares issued (in shares) | shares |  |  |  | 188,600,000 |  |  | 188,600,000 | 187,100,000 |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  |  |  |  | $ 0 | $ 222,000,000.0 | $ 269,800,000 |  |  |
Revolving Loans |  |  |  | $ 0 |  |  | $ 0 | $ 0 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized (in shares) | shares |  |  |  | 450,000,000 |  |  | 450,000,000 |  |  |  |  |
At Market Issuance |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares issued (in shares) | shares |  |  |  | 0 |  |  | 0 | 10,100,000 | 24,800,000 |  |  |
At Market Issuance | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  | $ 225,000,000 |  |  |  |  |  |  |  |  |
Debt for Equity Exchange |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares issued (in shares) | shares |  |  |  | 0 |  |  | 0 | 0 | 10,000,000.0 |  |  |
6.375% Senior Secured Notes due March 2025 (2025 Notes) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Exchange Offer, Percent of Accreted Value |  |  |  |  |  |  |  | 101.59% |  |  |  |
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 | shares |  |  |  |  | 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 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 |  |  |  | $ 74,700,000 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchase, amount |  |  |  |  | 23,100,000 |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  |  |  | 66,100,000 |  |  |  |
Debt repurchase, amount |  |  |  |  | 257,400,000 |  |  | $ 257,400,000 |  |  |  |
Debt Instrument, Exchange Offer, Percent of Accreted Value |  |  |  |  |  |  |  | 98.00% |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  | $ 11,400,000 |  |  |  |
Senior Notes | 10.00% Senior Secured Notes Due 2024 (New Co-Issuer Notes) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt exchange offer, required purchase amount (up to) |  |  |  |  |  |  |  | 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 exchange offer, required purchase amount (up to) |  |  |  |  | 100,000 |  |  |  |  |  |  |
Debt repurchase, amount |  |  |  |  | 62,600,000 |  |  | 62,500,000 |  |  |  |
Senior Notes | 10.00% Revolving Credit Facility maturing 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 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
Stated interest rate |  |  |  | 3.25% |  |  | 3.25% |  |  |  |  | 3.25%
Long-term debt |  |  |  | $ 320,000,000.0 |  |  | $ 320,000,000.0 | 320,000,000.0 |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  | $ 11,200,000 |  |  |  |  |  |  |
Common Stock, Excess of the Conversion Price, Percentage |  |  |  | 130.00% |  |  | 130.00% |  |  |  |  |
Principle Amount, Percentage |  |  |  | 98.00% |  |  | 98.00% |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  | $ 19.85 |  |  | $ 19.85 |  |  |  |  |
Debt Conversion, Converted Instrument, Rate |  |  |  | 1.00% |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  | 50.3816 |  |  |  |  |  |  |  |
Debt Instrument, Principle Amount |  |  |  | $ 1,000 |  |  | $ 1,000 |  |  |  |  |
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 |  |
Debt Instrument, Convertible, Conversion Ratio, Revised | 51.0440 |  |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Term Loan Due 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  |  |  | 2,900,000 |  |  |  |
Debt exchange offer, required purchase amount (up to) |  |  |  |  |  |  |  | 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 |  |  |  |
Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 3.25% |  |  |  |  |  |
Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.50% |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.75% |  |  | 0.75% |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  | $ 250,000,000 |  |  | $ 250,000,000 |  |  |  |  |
Commitment fee percentage |  | 0.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 320,000,000 |
Revolving Credit Facility | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 4.25% |  |  |  |  |  |
Revolving Credit Facility | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 3.50% |  |  |  |  |  |

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- Definition Common Stock, Excess of the Conversion Price, Percentage + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-5 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-7 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-6 + Details
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- 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 -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-5 + Details
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