Aggregate Principle Amount, Notes Outstanding

No definition available.

Name:	btu_AggregatePrincipleAmountNotesOutstanding
Namespace Prefix:	btu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash Collateral Posted

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Common Stock, Excess of the Conversion Price, Percentage

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Conversion Price Premium, Percent

+ References

No definition available.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Convertible, Conversion Ratio

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Aggregate Liquidity At End Of Each Quarter

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Liquidity Attributable To Co-Issuers

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Exchange Offer, Percent of Accreted Value

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No definition available.

+ Details

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Namespace Prefix:	btu_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

- Definition

Debt Instrument, Exchange Offer, Required Purchase Amount

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Exchange Offer, Required Purchase, Percentage Of Accreted Value

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument Exchanged, Aggregate Principal Amount

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Debt Instrument, Secured Liens Term, Percentage Of Capital Stock

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No definition available.

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Period Type:	instant

- Definition

Debt Repurchase, Aggregate Cost

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No definition available.

+ Details

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Balance Type:	credit
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- Definition

Debt repurchase, amount

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No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Debt Repurchase, mandatory prepayment, aggregate cost

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Financial Assurance Instruments

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payment For Debt Exchange

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Principle Amount, Percentage

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No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Restructuring Of Debt

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No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Retirement of Debt

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No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Revolving Loans

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

+ Details

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Period Type:	instant

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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

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Period Type:	instant

- 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

+ Details

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Balance Type:	na
Period Type:	instant

- 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

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- 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

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Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

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Balance Type:	debit
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Period Type:	instant

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Balance Type:	debit
Period Type:	duration

- 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.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) of the credit facility.

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- 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

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- 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.

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- 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.

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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.

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The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

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The cash inflow from the additional capital contribution to the entity.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

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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.

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Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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Per share or per unit amount of equity securities issued.

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No definition available.

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Long-term Debt - Textual (Details) - USD ($)				3 Months Ended	9 Months Ended	12 Months Ended			24 Months Ended
Long-term Debt - Textual (Details) - USD ($)	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)