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Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2022 | Nov. 06, 2020 | Apr. 03, 2017
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount | $ 452,600,000 |  |  |  |  |  |
Financial Instrument, Surety Bonds Amount | 1,463,700,000 |  |  |  |  |  |
Asset retirement obligations | 719,800,000 | $ 728,200,000 | $ 752,300,000 |  |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | 1,294,700,000 | 1,451,900,000 |  |  |  |  |
Letters of credit outstanding for reclamation | 323,000,000 |  |  |  |  |  |
Interest expense | 183,400,000 | 139,800,000 | 144,000,000.0 |  |  |  |
Provision for North Goonyella equipment loss | 0 | 0 | 83,200,000 | $ 66,400,000 |  |  |
Surety Bond |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Transaction support agreements, additional collateral to be posted |  |  |  |  |  | $ 75,000,000 |
Debt instrument, transaction support agreements, fair value of second liens on mining equipment |  |  |  |  |  | 200,000,000 |
Transaction support agreements, additional collateral to be posted per year through 2024 |  |  |  |  |  | 25,000,000 |
Transaction support agreements, additional collateral term, free cash flow in any twelve-month period |  |  |  |  |  | 100,000,000 |
Transaction support agreements, additional collateral term, sale of assets benchmark (in excess of) |  |  |  |  |  | $ 10,000,000 |
Obligations |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Restricted cash collateral | 0 | 0 | 0 |  |  |  |
Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 250,000,000
Line of credit facility, remaining borrowing capacity | 26,300,000 |  |  |  |  |  |
Accounts Receivable Securitization Program, April 3, 2020 | Scenario, Forecast |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  | $ 175,000,000 |  |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount | 143,900,000 |  |  |  |  |  |
Long-term debt | 0 |  |  |  |  |  |
Interest expense | $ 2,900,000 | $ 2,600,000 | 3,300,000 |  |  |  |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 | LIBOR |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |
Australian Mining |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  | $ 300,000 |  |  |  |

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- Definition Debt Instrument, Transaction Support Agreements, Additional Collateral Term, Free Cash Flow In Any Twelve-Month Period + References No definition available. + Details
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- Definition Debt Instrument, Transaction Support Agreements, Additional Collateral Term, Sale Of Assets Benchmark + References No definition available. + Details
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