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v3.25.1

Contingencies (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract] |  |
Environmental contingency accrual | $ 172.1 | $ 197.5
Loss Contingencies [Line Items] |  |
Accrued Environmental Loss Contingencies, Noncurrent | $ 102.1 | 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 | $ 70.0 | $ 90.8
New Wales Phase II East Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 8.6 |
New Wales Phase II West Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 67.6 |
Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 83.0 |
Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual | 63.1 |
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 623.1 |
Maximum | Brazilian Non Income Tax Proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 597.4 |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A. |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 208.4 |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 355.4 |
Maximum | Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | $ 410.4 |

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