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Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees (Details) $ in Millions, $ in Millions |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 AUD ($) | Dec. 31, 2023 AUD ($) | Apr. 14, 2023 USD ($) | Feb. 13, 2023 USD ($) | Mar. 01, 2022 USD ($)
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Interest expense, net of capitalized interest |  | $ 46.9 | $ 59.8 | $ 140.3 |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  | 682.2 | 680.9 |  |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  | 1,017.5 |  |  |  |  |  |  |
Net loss on early debt extinguishment |  | 0.0 | 8.8 | 57.9 |  |  |  |  |
Restricted cash and collateral |  | 809.8 | 957.6 |  |  |  |  |  |
Capitalized debt issuance costs related to bank guarantees |  | 1.4 |  |  |  |  |  |  |
Cash-backed bank guarantee facilities |  | 168.5 |  |  |  |  |  |  |
Surety Trust Account |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  | 394.6 | 444.0 |  |  |  |  |  |
Collateralized letters of credit funding |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  | 287.6 | 236.9 |  |  |  |  |  |
Deposits with Regulatory Authorities |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Deposits Assets |  | 127.6 | 276.7 |  | $ 205.0 | $ 404.0 |  |  |
Cash backed bank guarantees |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash included in “Restricted cash and collateral” |  |  |  |  | $ 271.0 | $ 95.0 |  |  |
Asset Retirement Obligations |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  | 925.1 |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | 55.2 |  |  |  |  |  |  |
Surety Bonds and Letters of Credit Outstanding for Reclamation Support |  | 980.3 |  |  |  |  |  |  |
Letters of Credit in Support of Surety Bonds |  | (55.2) |  |  |  |  |  |  |
Total Obligations Supported, Net |  | 925.1 |  |  |  |  |  |  |
Other Obligations |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  | 92.4 |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | 91.5 |  |  |  |  |  |  |
Surety Bonds and Letters of Credit Outstanding for Other Support |  | 183.9 |  |  |  |  |  |  |
Letters of Credit in Support of Surety Bonds |  | (0.1) |  |  |  |  |  |  |
Total Obligations Supported, Net |  | 183.8 |  |  |  |  |  |  |
Asset Retirement and Other Obligations |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Financial Instrument, Surety Bonds Amount |  | 1,017.5 |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | 146.7 |  |  |  |  |  |  |
Total Surety Bonds and Letters of Credit Outstanding |  | 1,164.2 |  |  |  |  |  |  |
Total Letters of Credit in Support of Surety Bonds |  | (55.3) |  |  |  |  |  |  |
Total Obligations Supported, Net |  | 1,108.9 |  |  |  |  |  |  |
Surety Bond |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Surety Agreement Liquidity Covenant, Amount |  | 400.0 |  |  |  |  |  |  |
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers |  | 495.5 |  |  |  |  |  |  |
Company maintain minimum liquidity |  |  |  |  |  |  | $ 237.2 |  |
Collateral amount held in trust accounts |  | 394.6 |  |  |  |  |  |  |
Collateral amount held as letters of credit |  | $ 127.4 |  |  |  |  |  |  |
Surety Bond | Maximum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument Covenant, Net Leverage Ratio |  | 1.5 |  |  | 1.5 |  |  |  |
Debt Instrument, Collateral Amount |  | $ 522.0 |  |  |  |  |  |  |
Surety Bond | Minimum |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument Covenant, Net Leverage Ratio |  | 1.0 |  |  | 1.0 |  |  |  |
3.250% Convertible Senior Notes due March 2028 | Surety Bond |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Funded, Percent |  | 50.00% |  |  | 50.00% |  |  |  |
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% |  |  |  |
Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 225.0 |
Interest expense, net of capitalized interest |  | $ 2.6 | 3.6 | 3.8 |  |  |  |  |
Line of Credit Facility, Previous Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 175.0 |
Accounts Receivable Securitization Program | Secured Debt |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.10% |  |  |  |  |  |  |
Long-term debt |  | $ 0.0 |  |  |  |  |  |  |
Interest expense, net of capitalized interest |  | 2.6 | 3.6 | $ 3.8 |  |  |  |  |
Accounts Receivable from Securitization |  | 138.4 |  |  |  |  |  |  |
Secured Debt | Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | 60.4 |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity | $ 324.0 | $ 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% |  |  |  |
Line of Credit Facility, Increase (Decrease), Net | $ 65.0 |  |  |  |  |  |  |  |
Net loss on early debt extinguishment |  |  | $ 8.8 |  |  |  |  |  |
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 |  | 115.6 |  |  |  |  |  |  |
Cash-collateralized Letters of Credit |  | $ 119.1 |  |  |  |  |  |  |

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