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Financial Instruments and Other Guarantees (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 06, 2020
Guarantee Obligations [Line Items] |  |  |  |  |
Letters of credit outstanding, amount | $ 443,200,000 |  | $ 443,200,000 |  |
Surety bonds amount | 1,462,400,000 |  | 1,462,400,000 |  |
Asset retirement obligations | 710,200,000 |  | 710,200,000 |  |
Surety bonds issued to support asset retirement obligations | 1,293,400,000 |  | 1,293,400,000 |  |
Letters of credit issued to support asset retirement obligations | 316,100,000 |  | 316,100,000 |  |
Net interest expense | 45,500,000 | $ 34,900,000 | 143,300,000 | $ 102,300,000 |
Surety Bond |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Transaction support agreements, percentage of Participating Sureties |  |  |  |  | 99.00%
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 2025 |  |  |  |  | 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
Accounts Receivable Securitization Program, April 1, 2022 | Secured debt |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Letters of credit outstanding, amount | 133,600,000 |  | 133,600,000 |  |
Line of credit facility, maximum borrowing capacity | 250,000,000 |  | 250,000,000 |  |
Outstanding borrowings | 0 |  | 0 |  |
Accounts Receivable from Securitization | 12,600,000 |  | 12,600,000 |  |
Net interest expense | $ 1,000,000 | $ 800,000 | $ 3,000,000 | $ 2,900,000 |
Secured debt | Accounts Receivable Securitization Program, April 1, 2022 | London Interbank Offered Rate (LIBOR) Swap Rate |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |

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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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- Definition Debt Instrument, Transaction Support Agreements, Additional Collateral To Be Posted Per Year Through 2025 + References No definition available. + Details
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- Definition Debt Instrument, Transaction Support Agreements, Fair Value Of Second Liens On Mining Equipment + References No definition available. + Details
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- Definition Debt Instrument, Transaction Support Agreements, One-Time Additional Collateral To Be Posted + References No definition available. + Details
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- Definition Debt Instrument, Transaction Support Agreements, Percentage Of Participating Sureties + References No definition available. + Details
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- Definition Financial Instrument, Surety Bonds Amount + References No definition available. + Details
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- Definition Financial Instrument, Surety Bonds Amount To Support Asset Retirement Obligations + References No definition available. + Details
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- Definition Letters Of Credit Issued To Support Asset Retirement Obligations + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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