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Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Apr. 01, 2022 | Jan. 31, 2022 | Nov. 06, 2020 | Apr. 03, 2017
Guarantee Obligations [Line Items] |  |  |  |  |  |
Letters of credit outstanding, amount | $ 469.1 |  |  |  |  |
Surety bonds amount | 1,484.9 |  |  |  |  |
Asset retirement obligations | 724.5 |  |  |  |  |
Net interest expense | 39.4 | $ 52.4 |  |  |  |
Surety Bonds Outstanding For Reclamation | 1,312.1 |  |  |  |  |
Letters of Credit Outstanding for Reclamation | 340.0 |  |  |  |  |
Surety Bond |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Transaction support agreements, additional collateral to be posted |  |  |  |  | $ 75.0 |
Transaction support agreements, additional collateral to be posted per year through 2025 |  |  |  | $ 13.0 | 25.0 |
Debt instrument, transaction support agreements, fair value of second liens on mining equipment |  |  |  |  | 200.0 |
Transaction support agreements, additional collateral term, free cash flow in any twelve-month period |  |  |  |  | 100.0 |
Transaction support agreements, additional collateral term, sale of assets benchmark (in excess of) |  |  |  |  | $ 10.0 |
Accounts Receivable Securitization Program, April 1, 2022 |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 250.0
Accounts Receivable Securitization Program, April 1, 2022 | Forecast |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 175.0 |  |  |
Accounts Receivable Securitization Program, April 1, 2022 | Secured debt |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Outstanding borrowings | 0.0 |  |  |  |  |
Net interest expense | 0.9 | $ 0.7 |  |  |  |
Accounts Receivable from Securitization | 1.6 |  |  |  |  |
Cash Collateral for Borrowed Securities | 24.7 |  |  |  |  |
Secured debt | Accounts Receivable Securitization Program, April 1, 2022 |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Letters of credit outstanding, amount | $ 161.8 |  |  |  |  |
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 | 2.10% |  |  |  |  |
Letter of Credit |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 250.0 |  |  |  |  |
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding | 103.00% |  |  |  |  |
Stated interest rate | 0.75% |  |  |  |  |
Deposit Rate, Percentage, Cash Collateral Posted | 0.0035 |  |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Transaction support agreements, additional collateral demands | $ 5.0 |  |  |  |  |

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- Definition Debt Instrument, Transaction Support Agreement, Additional Collateral Demands + 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 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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