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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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