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Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract] |  |
Environmental contingency accrual | $ 144.2 | $ 185.5
New Wales Phase II East Stack |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 36.3 |
Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 76.8 |
Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual | 65.4 |
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 695.4 |
Maximum | Brazilian Non Income Tax Proceedings |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 606.9 |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A. |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 215.1 |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | 381.9 |
Maximum | Brazilian subsidiary labor claims |  |
Loss Contingencies [Line Items] |  |
Maximum potential liabilitiy | $ 507.2 |

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