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Long-term Debt - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 07, 2022 USD ($) | Mar. 31, 2022 USD ($) d $ / shares shares | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) shares | Mar. 01, 2025 | Mar. 01, 2022 USD ($) | Feb. 24, 2022 $ / shares | Jan. 29, 2021 USD ($) | Nov. 06, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance cost |  | $ 31,200,000 |  | $ 34,800,000 |  |  |  |  |
Interest expense |  | 39,400,000 | $ 52,400,000 |  |  |  |  |  |
Net loss (gain) on early debt extinguishment |  | 23,500,000 | (3,500,000) |  |  |  |  |  |
Total finance lease liabilities |  | 27,600,000 |  | $ 29,300,000 |  |  |  |  |
Letters of credit outstanding, amount |  | 469,100,000 |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  | 222,000,000.0 | 0 |  |  |  |  |  |
Proceeds from (Payments for) Deposits Applied to Debt Retirements |  | 270,900,000 |  |  |  |  |  |  |
Payments for Deposits Applied to Debt Retirements |  | 232,400,000 |  |  |  |  |  |  |
Interest Paid, Capitalized, Investing Activities |  | 37,200,000 | 56,300,000 |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  | $ 23,000,000 |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 0.75% |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 250,000,000 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  | 187,000,000.0 |  | 176,300,000 |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  | 450,000,000.0 |  | 450,000,000.0 |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | shares |  | 10,000,000 |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  |  |  |  | $ 14.98 |  |
At Market Issuance |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | shares |  |  |  | 24,800,000 |  |  |  |  |
At Market Issuance | Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Sale of Stock, Description of Transaction | 225.0 million |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  | $ 106,100,000 |  |  |  |  |  |  |
Common Stock | At Market Issuance |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from common stock issuances, net of costs |  |  |  | $ 269,800,000 |  |  |  |  |
3.250% Convertible Senior Notes due March 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  | $ 1,000,000 |  |  |  |  |  |  |
10.00% Revolving Credit Facility maturing 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Description |  | 225.0 million |  |  |  |  |  |  |
Proceeds from lines of credit |  | $ 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 |  |  |  |  |  |  |
Surety Bond | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  | $ 13,500,000 | $ 10,900,000 |  |  |  |  |  |
Senior Notes | 6.000% Senior Secured Notes due March 2022 (2022 Notes) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.00% |  |  |  |  |  |  |
Long-term debt |  | $ 0 |  | 23,100,000 |  |  |  |  |
Payments for Deposits Applied to Debt Retirements |  | $ 23,100,000 |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.375% |  |  |  |  |  |  |
Long-term debt |  | $ 77,500,000 |  | 334,900,000 |  |  |  |  |
Debt Instrument, Debt Default, Amount |  | $ 257,400,000 |  |  |  |  |  |  |
Senior Notes | 8.500% Senior Secured Notes due December 2024 (2024 Peabody Notes) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 8.50% |  |  |  |  |  |  |
Long-term debt |  | $ 0 |  | 62,600,000 |  |  |  |  |
Debt Instrument, Exchange Offer, Required Purchase Amount |  |  |  | $ 38,600,000 |  |  |  |  |
Debt Instrument, Exchange Offer, Required Purchase, Percentage Of Accreted Value |  | 0.25 |  | 0.94940 |  |  |  |  |
Debt Instrument Exchanged, Aggregate Principal Amount |  | $ 30,000,000 |  | $ 100,000 |  |  |  |  |
Cash collateral or restricted cash requirement |  | $ 28,500,000 |  |  |  |  |  |  |
Senior Notes | 10.000% Senior Secured Notes due December 2024 (2024 Co-Issuer Notes) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 10.00% |  |  |  |  |  |  |
Net loss (gain) on early debt extinguishment |  | $ (500,000) |  |  |  |  |  |  |
Long-term debt |  | 193,600,000 |  | 193,900,000 |  |  |  |  |
Debt Instrument, Covenant, Liquidity Attributable To Co-Issuers |  |  |  |  |  |  |  | $ 60,000,000 |
Mandatory principal prepayment, if required, period payable, threshold |  | $ 105,600,000 |  |  |  |  |  |  |
Senior Notes | 3.250% Convertible Senior Notes due March 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.25% |  |  |  |  |  |  |
Long-term debt |  | $ 320,000,000.0 |  | 0 |  |  |  |  |
Principal amount |  |  |  |  |  | $ 320,000,000 |  |  |
Debt Issuance Costs, Gross |  | $ 11,200,000 |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | d |  | 30 |  |  |  |  |  |  |
Debt Instrument, Principle Amount |  | $ 1,000 |  |  |  |  |  |  |
Common Stock, Excess of the Conversion Price, Percentage |  | 1.30 |  |  |  |  |  |  |
Principle Amount, Percentage |  | 0.98 |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | shares |  | 50.3816 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  | $ 19.85 |  |  |  |  |  |  |
Conversion Price Premium, Percent |  |  |  |  |  |  | 0.325 |  |
Aggregate Principle Amount, Notes Outstanding |  | $ 75,000,000 |  |  |  |  |  |  |
Senior Notes | 3.250% Convertible Senior Notes due March 2028 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principle Amount, Percentage |  |  |  |  | 1 |  |  |  |
Senior Notes | 10.00% Revolving Credit Facility maturing 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 10.00% |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 150,000,000 |  |  |  |  |  |  |  |
Senior Notes | Peabody Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Debt Default, Amount |  | $ 62,600,000 |  |  |  |  |  |  |
Senior Notes | New Co-Issuer Term Note |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, if required, period payable, threshold |  | 300,000 |  |  |  |  |  |  |
Term Loan | Senior Secured Term Loan due 2024 (Co-Issuer Term Loans) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 188,800,000 |  | 206,000,000.0 |  |  |  |  |
Term Loan | Senior Secured Term Loan due 2025, net of original issue discount (Senior Secured Term Loan) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 321,800,000 |  | $ 322,800,000 |  |  |  |  |
Term Loan | Successor Credit Agreement | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  |  |  |  |
Line of credit | Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Aggregate Liquidity At End Of Each Quarter |  | $ 125,000,000 |  |  |  |  |  |  |
Surety Bond |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Transaction support agreements, additional collateral to be posted |  |  |  |  |  |  |  |  | $ 75,000,000
Loans | New Co-Issuer Term Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, if required, period payable, threshold |  | $ 17,200,000 |  |  |  |  |  |  |

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