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Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Guarantee Obligations [Line Items] |  |  |
Restricted Cash | $ 698.0 | $ 680.9 |
Deposits Assets | 127.1 | 276.7 |
Restricted cash and collateral | 825.1 | 957.6 |
Surety Trust Account |  |  |
Guarantee Obligations [Line Items] |  |  |
Restricted Cash | 398.4 | 444.0 | $ 566.3
Deposits with Regulatory Authorities |  |  |
Guarantee Obligations [Line Items] |  |  |
Deposits Assets | 127.1 | 276.7 |
Cash backed bank guarantees |  |  |
Guarantee Obligations [Line Items] |  |  |
Restricted Cash | 299.6 | $ 236.9 |
Asset Retirement Obligations |  |  |
Guarantee Obligations [Line Items] |  |  |
Surety bonds amount | 934.0 |  |
Letters of credit outstanding, amount | 52.5 |  |
Surety Bonds and Letters of Credit Outstanding for Reclamation Support | 986.5 |  |
Less: Letters of Credit in Support of Surety Bonds | 52.5 |  |
Total Obligations Supported, Net | 934.0 |  |
Asset Retirement and Other Obligations |  |  |
Guarantee Obligations [Line Items] |  |  |
Surety bonds amount | 1,042.1 |  |
Letters of credit outstanding, amount | 154.2 |  |
Total Obligations Supported, Net | 1,129.3 |  |
Total Surety Bonds and Letters of Credit Outstanding | 1,196.3 |  |
Total Letters of Credit in Support of Surety Bonds | (67.0) |  |
Other Obligations |  |  |
Guarantee Obligations [Line Items] |  |  |
Surety bonds amount | 108.1 |  |
Letters of credit outstanding, amount | 101.7 |  |
Less: Letters of Credit in Support of Surety Bonds | 14.5 |  |
Total Obligations Supported, Net | 195.3 |  |
Surety Bonds and Letters of Credit Outstanding for Other Support | 209.8 |  |
Secured debt | Accounts Receivable Securitization Program |  |  |
Guarantee Obligations [Line Items] |  |  |
Letters of credit outstanding, amount | 56.2 |  |
Letter of Credit |  |  |
Guarantee Obligations [Line Items] |  |  |
Letters of credit outstanding, amount | 98.0 |  |
Collateralized Letter of Credit Agreement |  |  |
Guarantee Obligations [Line Items] |  |  |
Letters of credit outstanding, amount | $ 116.6 |  |

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