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Income Taxes Effective tax rate (Details 2) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax [Line Items]          
Increase (Decrease) in Royalties Payable       $ 10.4  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 945.8 553.5 $ (18.7)
Valuation allowance $ 1,530.5   1,530.5 584.1  
Alternative minimum tax credit carryforwards 100.4   100.4 8.6  
Undistributed earnings of non-U.S. subsidiaries 15.0   15.0 15.0  
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount     0.7 $ (15.1) (54.2)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount         $ 23.3
Undistributed earnings withholding taxes     $ 15.0    
Computed tax at the U.S. federal statutory rate     21.00% 35.00% 35.00%
Deferred Income Tax Expense (Benefit)     $ (96.4) $ 616.6 $ (111.5)
Refund of Future Alternative Minimum Tax Credits     (8.6)    
The components of earnings from consolidated companies before income taxes, and the effects of significant adjustments to tax computed at the federal statutory rate, were as follows:          
United States earnings (loss)     322.7 (82.5) (96.4)
Non-U.S. earnings     228.8 456.5 338.8
Earnings from consolidated companies before income taxes     $ 551.5 $ 374.0 $ 242.4
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation          
State and local income taxes, net of federal income tax benefit     2.00% (0.10%) (6.10%)
Percentage depletion in excess of basis     (6.70%) (13.20%) (34.40%)
Impact of non-U.S. earnings     11.80% (46.90%) (4.00%)
Change in valuation allowance     (15.20%) 148.80% 7.70%
Resolution of uncertain tax positions     (0.40%) 0.00% (34.90%)
Share-based excess cost/(benefits)     0.70% 2.00% 2.20%
Other items (none in excess of 5% of computed tax)     0.80% 6.70% 3.90%
Effective tax rate     14.00% 132.30% (30.60%)
Effective Income Tax Rate Reconciliation, Amounts          
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount     $ 1.0 $ 6.1  
Effective income tax rate reconciliation, resolution of Advanced Pricing Agreement, amount         $ (85.8)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount       7.5 $ 8.3
Foreign Tax Credit Carryforward [Member]          
Income Tax [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (30.6)    
United States          
Income Tax [Line Items]          
Deferred Income Tax Expense (Benefit)       14.9  
Peru          
Income Tax [Line Items]          
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     6.7    
United States Tax Cuts and Jobs Act Law [Member]          
Income Tax [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     30.7    
Valuation allowance 440.3   440.3 546.1  
Alternative minimum tax credit carryforwards 121.5   121.5    
Estimated impacts on deferred tax and tax expenses       457.5  
Undistributed earnings of non-U.S. subsidiaries       202.6  
Sequestration Rules, refundable alternative minimum tax     8.6    
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount 9.0   12.2 107.7  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     $ 2.3    
Computed tax at the U.S. federal statutory rate     21.00%    
Foreign Tax Authority [Member]          
Income Tax [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 11.7    
Anticipatory Foreign Tax Credit Carryforward [Member] | United States Tax Cuts and Jobs Act Law [Member]          
Income Tax [Line Items]          
Valuation allowance 361.6   361.6 440.3  
Foreign Tax Credit Carryforward [Member]          
Income Tax [Line Items]          
Tax Credit Carryforward, Amount 493.5   493.5    
Foreign Tax Credit Carryforward [Member] | United States Tax Cuts and Jobs Act Law [Member]          
Income Tax [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     30.6    
Valuation allowance 156.8   156.8 $ 105.8  
Alternative Minimum Tax Credit Carryforward [Member]          
Income Tax [Line Items]          
Tax Credit Carryforward, Amount 76.5   76.5    
Alternative Minimum Tax Credit Carryforward [Member] | United States Tax Cuts and Jobs Act Law [Member]          
Income Tax [Line Items]          
Tax Credit Carryforward, Amount 100.4   100.4    
Estimate | United States Tax Cuts and Jobs Act Law [Member]          
Income Tax [Line Items]          
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount   $ 21.2      
Tax Year 2028 Or Earlier [Member] | Foreign Tax Credit Carryforward [Member]          
Income Tax [Line Items]          
Tax Credit Carryforward, Amount $ 221.6   221.6    
Vale Fertilizantes S.A. [Member]          
Income Tax [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 956.2