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Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
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

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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