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Contingencies (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 31, 2016 | Dec. 31, 2013 USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract] |  |  |  |  |
Environmental contingency accrual |  | $ 56.4 | $ 61.4 |  |
New Wales water loss incident |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number Of Cells With Sinkholes |  |  |  | 1 |
Number Of Cells In The Active Stack |  |  |  | 2 |
Brazilian subsidiary judicial and administrative proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 57.5 |  |  |
Brazilian subsidiary labor claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency Accrual |  | 51.4 |  |  |
Brazilian subsidiary environmental claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency Accrual |  | 4.4 |  |  |
Brazilian subsidiary other civil contingent liabilities and other claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 1.7 |  |  |
Uberaba gypstacks settled litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 0.3 |  |  |  |
Uberaba EHS Class Action pending litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  |  |  |  | $ 27.5
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 748.0 |  |  |
Maximum | Brazilian Non Income Tax Proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 331.2 |  |  |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A. |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 154.3 |  |  |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 217.4 |  |  |
Maximum | Brazilian subsidiary labor claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 596.5 |  |  |
Maximum | Brazilian subsidiary environmental claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 17.1 |  |  |
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 130.9 |  |  |
Maximum | Brazilian subsidiary indemnification of mining rights exploration costs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 3.6 |  |  |
Minimum | New Wales water loss incident |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Financial assurance to support off-site monitoring and sinkhole remediation costs |  | $ 40.0 |  |  |

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