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Income Taxes Income Tax Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 774.1	$ 73.4	$ 945.8
Valuation allowance	683.0	1,457.1
Tax Credit Carryforward, Valuation Allowance		49.8
Operating Loss Carryforwards, Valuation Allowance	24.1	6.8
PERU
Valuation Allowance [Line Items]
Operating Loss Carryforwards, Valuation Allowance	0.9	8.3
Foreign Tax Authority
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	32.2	9.2
United States
Valuation Allowance [Line Items]
Operating Loss Carryforwards, Valuation Allowance	3.5
United States Tax Cuts and Jobs Act Law
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		30.7
Vale Fertilizantes S.A.
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 763.5	$ 48.0	$ 956.2

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB
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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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