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Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2015 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2016	Dec. 31, 2013 USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]
Environmental contingency accrual		$ 58.5	$ 39.3
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		61.0
Brazilian subsidiary labor claims
Loss Contingencies [Line Items]
Loss Contingency Accrual		54.9
Brazilian subsidiary environmental claims
Loss Contingencies [Line Items]
Loss Contingency Accrual		4.2
Brazilian subsidiary other civil contingent liabilities and other claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		1.9
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					$ 26.7
Maximum | Brazilian subsidiary judicial and administrative proceedings
Loss Contingencies [Line Items]
Maximum potential liabilitiy		830.0
Maximum | Brazilian Non Income Tax Proceedings
Loss Contingencies [Line Items]
Maximum potential liabilitiy		322.7
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A.
Loss Contingencies [Line Items]
Maximum potential liabilitiy		153.7
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases
Loss Contingencies [Line Items]
Maximum potential liabilitiy		214.0
Maximum | Brazilian subsidiary labor claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		578.7
Maximum | Brazilian subsidiary environmental claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		108.9
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		138.8
Maximum | Brazilian subsidiary indemnification of mining rights exploration costs
Loss Contingencies [Line Items]
Maximum potential liabilitiy		3.4
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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Financial assurance obligation required to support remediation costs through, but not limited to, a financial strength test or a parent guarantee.

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