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Long-term Debt - Schedule of Debt (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2023 USD ($) buyer $ / shares shares	Mar. 31, 2022 USD ($) shares	Dec. 31, 2023 USD ($) buyer $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Mar. 01, 2025 USD ($)	Mar. 07, 2022 USD ($)	Mar. 01, 2022 USD ($)
Debt Instrument [Line Items]
Finance Lease, Liability	$ 22,300,000		$ 22,300,000	$ 23,600,000
Less: Debt issuance costs	(8,100,000)		(8,100,000)	(9,800,000)
Debt and Lease Obligation, Net	334,200,000		334,200,000	333,800,000
Less: Current portion of long-term debt	13,500,000		13,500,000	13,200,000
Long-Term Debt and Lease Obligation, Total	$ 320,700,000		320,700,000	320,600,000
Interest expense			59,800,000	140,300,000	$ 183,400,000
Financial Assurance Instruments			38,200,000	53,300,000	51,100,000
Interest Paid, Capitalized, Investing Activities			$ 61,900,000	$ 118,500,000	174,900,000
Common Stock, shares authorized (in shares) | shares	450,000,000.0		450,000,000.0	450,000,000.0
Proceeds from common stock issuances, net of costs			$ 0	$ 222,000,000.0	269,800,000
Common Stock, shares issued (in shares) | shares	188,600,000		188,600,000	187,100,000
Net loss (gain) on early debt extinguishment			$ (8,800,000)	$ (57,900,000)	33,200,000
Noncash interest expense, net			$ 4,600,000	$ 17,700,000	$ 21,300,000
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
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
Debt for Equity Exchange
Debt Instrument [Line Items]
Common Stock, shares issued (in shares) | shares	0		0	0	10,000,000.0
3.250% Convertible Senior Notes due March 2028
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | buyer	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days | buyer	30
Indebtedness
Debt Instrument [Line Items]
Interest expense			$ 21,600,000	$ 87,000,000.0	$ 132,300,000
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
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
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
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
Senior Notes | 8.500% Senior Secured Notes due 2024 (New Peabody Notes)
Debt Instrument [Line Items]
Debt repurchase, amount		62,600,000		62,500,000
Senior Notes | 3.250% Convertible Senior Notes due March 2028
Debt Instrument [Line Items]
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 principal amount								$ 320,000,000
Debt Issuance Costs, Gross		$ 11,200,000
Common Stock, Excess of the Conversion Price, Percentage	130.00%		130.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days | buyer			30
Debt Instrument, Principle Amount	$ 1,000		$ 1,000
Principle Amount, Percentage	98.00%		98.00%
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 19.85		$ 19.85
Senior Notes | 3.250% Convertible Senior Notes due March 2028 | Minimum
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Consecutive Trading Days | buyer	20
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
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 | 10.00% Revolving Credit Facility maturing 2025
Debt Instrument [Line Items]
Stated interest rate							10.00%
Exit facility, maximum borrowing capacity							$ 150,000,000
Term Loan | Senior Secured Term Loan Due 2024
Debt Instrument [Line Items]
Payment for debt extinguishment or debt prepayment cost				2,900,000
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

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