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Income Taxes (Details 4)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2022
USD ($)
Operating Loss Carryforwards [Line Items]            
Terra amended tax returns   $ 0.0   $ (24.0) $ (10.0)  
Interest income       26.0    
Income Tax Expense (Benefit)   (283.0)   (31.0) (126.0)  
Income Tax Examination, Interest Income, Net of Tax       23.0    
Reductions related to settlements with tax jurisdictions   59.0   23.0    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions       9.0    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority, Income Tax Matter $ 68.0 68.0        
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority, Withholding Tax Matter 42.0 42.0        
Less: Net earnings attributable to noncontrolling interest   343.0   115.0 153.0  
Non-deductible goodwill impairment   60.0   0.0 0.0  
Deferred tax assets, capital loss carryforwards 90.0 90.0        
Tax credit carryforward decrease during period   27.0        
Tax credit carryforwards not expected to be realized 18.0 18.0        
Liability (refund) adjustment from settlement with taxing authority 110.0 110.0        
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 21.0 21.0        
Additions for tax positions taken during the current year   0.0   0.0    
Interest expense and penalties            
Interest expense and penalties related to potential income taxes       (29.0) $ 4.0  
Accrued interest expense and penalties            
Amount recognized in consolidated balance sheets for accrued interest and penalties related to income taxes 4.0 4.0   4.0    
Terra Amended Tax Returns            
Operating Loss Carryforwards [Line Items]            
Reductions related to settlements with tax jurisdictions   19.0        
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 4.0          
Tax Year 2012 - 2016            
Operating Loss Carryforwards [Line Items]            
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions   13.0        
Subsequent Event            
Operating Loss Carryforwards [Line Items]            
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority, Withholding Tax Matter           $ 20.0
Canada Revenue Agency            
Operating Loss Carryforwards [Line Items]            
Tax assessment amount   138.0 $ 174      
Internal Revenue Service (IRS)            
Operating Loss Carryforwards [Line Items]            
Reductions related to settlements with tax jurisdictions       12.0    
Liability (refund) adjustment from settlement with taxing authority (38.0) (38.0)        
State Tax Authority            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards 37.0 37.0        
Liability (refund) adjustment from settlement with taxing authority 12.0 12.0        
Additions for tax positions taken during the current year   5.0        
Foreign Tax Authority            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards increase (decrease) valuation allowance 99.0 99.0        
Non-deductible goodwill impairment       (99.0)    
Operating loss carryforwards $ 118.0 118.0        
Foreign Tax Authority | Canada Revenue Agency            
Operating Loss Carryforwards [Line Items]            
Interest income       10.0    
Domestic Tax Authority            
Operating Loss Carryforwards [Line Items]            
Interest income       16.0    
Income Tax Expense (Benefit)       18.0    
Point Lisas Nitrogen Limited (PLNL) | Foreign Tax Authority            
Operating Loss Carryforwards [Line Items]            
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 12.0   6.0    
Interest Income | Internal Revenue Service (IRS)            
Operating Loss Carryforwards [Line Items]            
Terra amended tax returns       5.0    
interest income, net | Internal Revenue Service (IRS)            
Operating Loss Carryforwards [Line Items]            
Terra amended tax returns       4.0    
income tax benefit | Internal Revenue Service (IRS)            
Operating Loss Carryforwards [Line Items]            
Terra amended tax returns       $ 10.0