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Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
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

X

- Definition

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

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