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Contingencies (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract] |  |
Environmental contingency accrual | $ 189.6 | $ 197.5
Loss Contingencies [Line Items] |  |
Accrued Environmental Loss Contingencies, Noncurrent | $ 132.5 | 106.7
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Accrued liabilities |
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accrued liabilities |
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities |
Accrued Environmental Loss Contingencies, Current | $ 57.1 | $ 90.8
New Wales Phase II East Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 9.0 |
New Wales Phase II West Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 77.0 |
Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 86.4 |
Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual | 64.5 |
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 610.1 |
Maximum | Brazilian Non Income Tax Proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 700.5 |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A. |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 207.4 |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 379.6 |
Maximum | Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | $ 401.3 |

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