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v3.25.1

Financial Instruments and Other Guarantees (Details) $ in Millions, $ in Millions | Mar. 31, 2025 USD ($) | Mar. 31, 2025 AUD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 AUD ($)
--- | --- | --- | --- | ---
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash | $ 687.3 |  | $ 682.2 |
Restricted cash and collateral | 815.3 |  | 809.8 |
Surety Trust Account |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash | 398.0 |  | 394.6 |
Deposits with Regulatory Authorities |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Deposits Assets | 128.0 | $ 204.0 | 127.6 | $ 205.0
Cash backed bank guarantees |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash |  | $ 271.0 |  | $ 271.0
Collateralized letters of credit funding |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash | 289.3 |  | $ 287.6 |
Asset Retirement Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Surety bonds amount | 931.8 |  |  |
Letters of credit outstanding, amount | 55.2 |  |  |
Surety Bonds and Letters of Credit Outstanding for Reclamation Support | 987.0 |  |  |
Less: Letters of Credit in Support of Surety Bonds | 55.2 |  |  |
Total Obligations Supported, Net | 931.8 |  |  |
Asset Retirement and Other Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Surety bonds amount | 1,024.0 |  |  |
Letters of credit outstanding, amount | 109.7 |  |  |
Total Surety Bonds and Letters of Credit Outstanding | 1,133.7 |  |  |
Total Letters of Credit in Support of Surety Bonds | (55.3) |  |  |
Total Obligations Supported, Net | 1,078.4 |  |  |
Other Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Surety bonds amount | 92.2 |  |  |
Letters of credit outstanding, amount | 54.5 |  |  |
Surety Bonds and Letters of Credit Outstanding for Other Support | 146.7 |  |  |
Less: Letters of Credit in Support of Surety Bonds | 0.1 |  |  |
Total Obligations Supported, Net | 146.6 |  |  |
Secured debt | Accounts Receivable Securitization Program |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 60.4 |  |  |
Letter of Credit |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 49.3 |  |  |
Collateralized Letter of Credit Agreement |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | $ 115.6 |  |  |

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