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Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jul. 01, 2022 | Apr. 01, 2022 | Jan. 31, 2022 | Nov. 06, 2020 | Apr. 03, 2017
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | $ 475.1 |  | $ 475.1 |  |  |  |  |  |
Surety bonds amount | 1,453.5 |  | 1,453.5 |  |  |  |  |  |
Asset retirement obligations | 725.1 |  | 725.1 |  |  |  |  |  |
Net interest expense | 37.6 | $ 45.4 | 77.0 | $ 97.8 |  |  |  |  |
Surety Bonds Outstanding For Reclamation | 1,276.9 |  | 1,276.9 |  |  |  |  |  |
Letters of Credit Outstanding for Reclamation | 346.4 |  | 346.4 |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | 12.3 |  | 12.3 |  |  |  |  |  |
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 |  |  |  |  | $ 25.7 |  | $ 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 |  |  |  |  |  | $ 175.0 |  |  | $ 250.0
Accounts Receivable Securitization Program, April 1, 2022 | Secured debt |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings | 0.0 |  | 0.0 |  |  |  |  |  |
Net interest expense | 0.9 | $ 0.7 | 1.8 | $ 1.4 |  |  |  |  |
Accounts Receivable from Securitization | 13.5 |  | 13.5 |  |  |  |  |  |
Secured debt | Accounts Receivable Securitization Program, April 1, 2022 |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | 161.5 |  | $ 161.5 |  |  |  |  |  |
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 |  | $ 250.0 |  |  |  |  |  |
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding | 103.00% |  | 103.00% |  |  |  |  |  |
Stated interest rate | 0.75% |  | 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 |  | $ 5.0 |  |  |  |  |  |

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