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v3.23.2

Financial Instruments and Other Guarantees - Narratives (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Apr. 14, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 06, 2020 USD ($)
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 237.2 |  |  | $ 237.2 |  |  |  |  |
Cumulative Collateral | 557.8 |  |  |  |  |  |  |  |
Net loss on early debt extinguishment | 2.0 | $ 2.3 |  | 8.8 | $ 25.8 |  |  |  |
Interest expense | 13.3 | 37.6 |  | 31.7 | 77.0 |  |  |  |
Restricted Cash | 731.4 |  |  | 731.4 |  |  |  | $ 110.3 |
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers | 533.6 |  |  | $ 533.6 |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 324.0 |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net | (65.0) |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 6.00% |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  | 0.50% |  |  |  |  |
Collateralized Letter of Credit Agreement |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | 168.2 |  |  | $ 168.2 |  |  |  |  |
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% |  |  |  |  |
Cash-collateralized Letters of Credit | $ 173.2 |  |  | $ 173.2 |  |  |  |  |
Stated interest rate | 0.75% |  |  | 0.75% |  |  |  |  |
Surety Trust Account |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted Cash | $ 558.2 |  |  | $ 558.2 |  |  | $ 566.3 | $ 0.0 |
Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Previous Maximum Borrowing Capacity | 175.0 |  |  | 175.0 |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 225.0 |  |  | 225.0 |  |  |  |  |
Accounts Receivable Securitization Program | Secured debt |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | 117.8 |  |  | $ 117.8 |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.10% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Amount |  |  |  |  |  | $ 721.8 |  |  |
Maximum | Collateralized Letter of Credit Agreement |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Transaction support agreements, additional collateral demands | 5.0 |  |  | $ 5.0 |  |  |  |  |
Surety Bond |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Transaction Support Agreements, Additional Collateral Posted | 140.5 |  |  | 140.5 |  |  |  |  |
Debt Instrument, Transaction Support Agreement, Additional Collateral Held | $ 15.0 |  |  | $ 15.0 |  |  |  |  |
Surety Agreement Liquidity Covenant, Amount |  |  |  |  |  | $ 400.0 |  |  |
Debt instrument, transaction support agreements, fair value of second liens on mining equipment |  |  |  |  |  |  |  |  | $ 200.0
Surety Bond | Maximum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net Leverage Ratio |  |  |  |  |  | 1.5 |  |  |
Surety Bond | Minimum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net Leverage Ratio |  |  |  |  |  | 1.0 |  |  |
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Funded, Percent |  |  |  |  |  | 50.00% |  |  |
Stated interest rate | 3.25% |  |  | 3.25% |  |  |  |  |
Secured debt | Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings | $ 0.0 |  |  | $ 0.0 |  |  |  |  |
Accounts Receivable from Securitization | 34.8 |  |  | 34.8 |  |  |  |  |
Interest expense | $ 0.8 | $ 0.9 |  | $ 1.9 | $ 1.8 |  |  |  |

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