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Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 03, 2017
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | $ 437,600,000 |  |  |
Asset retirement obligations | 728,200,000 | $ 752,300,000 | $ 750,200,000 |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | 1,451,900,000 | 1,401,700,000 |  |
Letters of credit outstanding for reclamation | 315,000,000.0 |  |  |
Line of credit facility, remaining borrowing capacity | 200,000 |  |  |
Interest expense | 139,800,000 | 144,200,000 | 151,300,000 |
Provision for North Goonyella equipment loss | 0 | 83,200,000 | 66,400,000 |
Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Restricted cash collateral | 323,100,000 | 323,100,000 |  |
Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  | $ 250,000,000.0
Line of credit facility, remaining borrowing capacity | 19,300,000 |  |  |
Surety Bond |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Debt principal amount | 1,633,600,000 |  |  |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 112,300,000 |  |  |
Long-term debt | 0 |  |  |
Cash collateral required | 0 |  |  |
Interest expense | $ 2,600,000 | 3,300,000 | 5,200,000 |
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 | $ 50,400,000 |

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