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Contingencies (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract] |  |
Environmental contingency accrual | $ 231.7 | $ 203.2
New Wales Phase II East Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 21.9 |
New Wales Phase II West Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 105.0 |
Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 70.0 |
Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual | 59.3 |
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 628.3 |
Maximum | Brazilian Non Income Tax Proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 648.5 |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A. |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 220.9 |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 341.4 |
Maximum | Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | $ 430.8 |

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