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Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Apr. 14, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash | $ 731.4 |  |  | $ 110.3
Deposits Assets | 194.0 |  |  | 77.1
Restricted cash and collateral | 925.4 |  |  | 187.4
LC Facility |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Deposits Assets | 0.0 |  |  | 28.5
Surety Trust Account |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash | 558.2 |  | $ 566.3 | 0.0
Collateralized letters of credit funding |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Restricted Cash | 173.2 |  |  | 110.3
Deposits with Regulatory Authorities |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Deposits Assets | 194.0 |  |  | 33.6
Deposits Held on Behalf of Surety |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Deposits Assets | 0.0 |  |  | 15.0
Asset Retirement Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 23.8 |  |  | 437.8
Surety Bonds and Letters of Credit Outstanding for Reclamation Support | 1,142.8 |  |  | 1,687.9
Letters of Credit in Support of Surety Bonds | (23.8) |  |  | (431.7)
Total Obligations Supported, Net | 1,119.0 |  |  | 1,256.2
Surety bonds amount | 1,119.0 |  |  | 1,250.1
Asset Retirement and Other Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 117.8 |  |  | 569.6
Total Surety Bonds and Letters of Credit Outstanding | 1,349.9 |  |  | 1,946.4
Total Letters of Credit in Support of Surety Bonds | (29.7) |  |  | (468.9)
Total Obligations Supported, Net | 1,320.2 |  |  | 1,477.5
Surety bonds amount | 1,232.1 |  |  | 1,376.8
Other Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 94.0 |  |  | 131.8
Surety Bonds and Letters of Credit Outstanding for Other Support | 207.1 |  |  | 258.5
Letters of Credit in Support of Surety Bonds | (5.9) |  |  | (37.2)
Total Obligations Supported, Net | 201.2 |  |  | 221.3
Surety bonds amount | $ 113.1 |  |  | $ 126.7
LC Facility |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Mandatory Repurchase, Percentage of Accreted Value | 95.00% |  |  |
Debt instrument, repurchase amount | $ 30.0 | $ 30.0 |  |
Secured debt | Accounts Receivable Securitization Program |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 117.8 |  |  |
Collateralized Letter of Credit Agreement |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | $ 168.2 |  |  |

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