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Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees (Details) - USD ($) $ in Millions |  | 3 Months Ended | 11 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 14, 2023 | Feb. 13, 2023 | Mar. 01, 2022
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Asset retirement obligations |  |  |  | $ 702.8 | $ 750.0 | $ 719.8 |  |  |
Interest expense |  |  |  | 59.8 | 140.3 | 183.4 |  |  |
Restricted cash included in “Restricted cash and collateral” |  |  |  | 680.9 | 110.3 |  |  |  |
Cumulative Collateral Posted |  |  |  | 557.8 |  |  |  |  |
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers |  |  |  | 555.2 |  |  |  |  |
Company maintain minimum liquidity |  |  |  |  |  |  | $ 237.2 |  |
Net loss (gain) on early debt extinguishment |  |  |  | 8.8 | 57.9 | (33.2) |  |  |
Deposits Assets |  |  |  | 276.7 | 77.1 |  |  |  |
restricted cash and collateral |  |  |  | 957.6 | 187.4 |  |  |  |
Surety Trust Account |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  | $ 566.3 |  | 444.0 | 0.0 |  |  |  |
Collateralized letters of credit funding |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  |  |  | 172.0 | 110.3 |  |  |  |
Deposits with Regulatory Authorities |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Deposits Assets |  |  |  | 276.7 | 33.6 |  |  |  |
LC Facility |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Deposits Assets |  |  |  | 0.0 | 28.5 |  |  |  |
Deposits Held on Behalf of Surety |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Deposits Assets |  |  |  | 0.0 | 15.0 |  |  |  |
Cash backed bank guarantees |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  |  |  | 64.9 | 0.0 |  |  |  |
Asset Retirement Obligations |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | 6.0 |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  |  |  | 1,022.6 |  |  |  |  |
Surety Bonds and Letters of Credit Outstanding for Reclamation Support |  |  |  | 1,028.6 |  |  |  |  |
Letters of Credit in Support of Surety Bonds |  |  |  | (6.0) |  |  |  |  |
Total Obligations Supported, Net |  |  |  | 1,022.6 |  |  |  |  |
Other Obligations |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | 102.1 |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  |  |  | 117.3 |  |  |  |  |
Surety Bonds and Letters of Credit Outstanding for Other Support |  |  |  | 219.4 |  |  |  |  |
Letters of Credit in Support of Surety Bonds |  |  |  | (12.2) |  |  |  |  |
Total Obligations Supported, Net |  |  |  | 207.2 |  |  |  |  |
Asset Retirement and Other Obligations |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | 108.1 |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  |  |  | 1,139.9 |  |  |  |  |
Total Surety Bonds and Letters of Credit Outstanding |  |  |  | 1,248.0 |  |  |  |  |
Total Letters of Credit in Support of Surety Bonds |  |  |  | (18.2) |  |  |  |  |
Total Obligations Supported, Net |  |  |  | 1,229.8 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Amount |  |  |  |  |  |  | 721.8 |  |
Maximum | Subsequent Event |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.25% |  |  |  |  |  |
Minimum | Subsequent Event |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.50% |  |  |  |  |  |
Surety Bond |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, transaction support agreements, fair value of second liens on mining equipment |  |  |  | 200.0 |  |  |  |  |
Debt Instrument, Transaction Support Agreements, Additional Collateral Posted |  | 140.5 |  |  |  |  |  |  |
Surety Agreement Liquidity Covenant, Amount |  |  |  | $ 400.0 |  |  |  |  |
Debt Instrument, Transaction Support Agreement, Additional Collateral Held |  | $ 15.0 |  |  |  |  |  |  |
Surety Bond | Maximum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument Covenant, Net Leverage Ratio |  |  |  | 1.5 |  |  |  |  |
Surety Bond | Minimum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument Covenant, Net Leverage Ratio |  |  |  | 1.0 |  |  |  |  |
3.250% Convertible Senior Notes due March 2028 | Senior Notes |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  | $ 320.0
Stated interest rate |  |  |  | 3.25% |  |  |  |  | 3.25%
Debt Instrument, Funded, Percent |  |  |  | 50.00% |  |  |  |  |
Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 225.0 |
Line of Credit Facility, Previous Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 175.0 |
Accounts Receivable Securitization Program | Secured Debt |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0.0 |  |  |  |  |
Interest expense |  |  |  | 3.6 | 3.8 | $ 2.9 |  |  |
Accounts Receivable from Securitization |  |  |  | 90.4 |  |  |  |  |
LC Facility |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  | $ 30.0 |  | $ 30.0 |  |
Mandatory Repurchase, Percentage of Accreted Value |  |  |  |  | 95.00% |  |  |  |
Secured Debt | Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | $ 108.1 |  |  |  |  |
Secured Debt | Accounts Receivable Securitization Program | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.10% |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Exit 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% |  |  |  |  |
Debt amount incurred | $ 324.0 |  |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net | $ 65.0 |  |  |  |  |  |  |  |
Revolving credit facility, fee on unused borrowings | 6.00% |  |  |  |  |  |  |  |
Commitment fee percentage | 0.50% |  |  |  |  |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Transaction support agreements, additional collateral demands |  |  |  | $ 5.0 |  |  |  |  |
Collateralized Letter of Credit Agreement |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | 167.0 |  |  |  |  |
Cash-collateralized Letters of Credit |  |  |  | $ 172.0 |  |  |  |  |

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