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Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 24, 2016
Applicability, Impact and Conclusion of Environmental Loss Contingencies |  |  |  |
Environmental contingency accrual |  | $ 61.4 | $ 39.3 |
Brazilian subsidiary judicial and administrative proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 61.3 |  |
Brazilian subsidiary labor claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual |  | 54.4 |  |
Brazilian subsidiary other civil contingent liabilities and other claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 2.2 |  |
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] |  |  |  |
Estimated loss contingency |  | 29.0 |  |
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 800.2 |  |
Maximum | Brazilian Non Income Tax Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 354.8 |  |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 165.0 |  |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins cases |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 234.2 |  |
Maximum | Brazilian subsidiary labor claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 624.8 |  |
Maximum | Brazilian subsidiary environmental claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 18.3 |  |
Loss Contingency Accrual |  | 4.8 |  |
Maximum | Brazilian subsidiary mining claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | 3.8 |  |
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated loss contingency |  | $ 153.2 |  |
Minimum | Water loss incident |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Financial assurance to support off-site monitoring and sinkhole remediation costs |  |  |  | $ 40.0

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