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Income Taxes (Details 4)
$ in Millions, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Operating Loss Carryforwards [Line Items]                
Less: Net earnings attributable to noncontrolling interest         $ 591.0 $ 343.0 $ 115.0  
Decrease resulting from prior period tax positions             9.0  
Liability (refund) adjustment from settlement with taxing authority             110.0  
Transfer pricing arbitration         69.0 0.0 0.0  
State income taxes, net of federal         143.0 34.0 (1.0)  
Terra amended tax returns         0.0 0.0 (24.0)  
Interest income             26.0  
Income tax expense (benefit)         (1,158.0) (283.0) (31.0)  
Interest income, net             23.0  
Income tax matter             68.0  
Withholding tax matter             42.0 $ 20.0
Undistributed earnings $ 12.0     $ 12.0 12.0 0.0    
State tax credits 7.0     7.0 7.0 29.0    
Tax credit carryforward decrease during period           27.0    
Tax credit carryforwards not expected to be realized           18.0    
Deferred tax assets, capital loss carryforwards             90.0  
Additions for tax positions taken during prior years         154.0 5.0    
Unrecognized tax benefits 181.0     181.0 181.0 27.0 81.0  
Unrecognized tax benefits that would impact effective tax rate 6.0     6.0 6.0      
Additions for tax positions taken during the current year         0.0 0.0    
Reductions related to settlements with tax jurisdictions         0.0 59.0    
Interest expense and penalties                
Interest expense and penalties related to potential income taxes         66.0   (29.0)  
Accrued interest expense and penalties                
Amount recognized in consolidated balance sheets for accrued interest and penalties related to income taxes 62.0     62.0 62.0 4.0    
Tax Year 2012 - 2016                
Operating Loss Carryforwards [Line Items]                
Decrease resulting from prior period tax positions           13.0    
Internal Revenue Service (IRS)                
Operating Loss Carryforwards [Line Items]                
Liability (refund) adjustment from settlement with taxing authority           (38.0)    
Reductions related to settlements with tax jurisdictions             12.0  
State Tax Authority                
Operating Loss Carryforwards [Line Items]                
Liability (refund) adjustment from settlement with taxing authority           12.0    
Operating loss carryforwards 33.0     33.0 33.0      
Additions for tax positions taken during the current year           5.0    
Foreign Tax Authority                
Operating Loss Carryforwards [Line Items]                
Operating loss carryforwards 114.0     114.0 114.0      
Tax credit carryforward valuation allowance 44.0     44.0 44.0      
Unrecognized tax benefits increase in period         26.0      
Foreign Tax Authority | Canada Revenue Agency                
Operating Loss Carryforwards [Line Items]                
Interest income             10.0  
Domestic Tax Authority                
Operating Loss Carryforwards [Line Items]                
Income taxes receivable 51.0     51.0 51.0      
Interest income             16.0  
Income tax expense (benefit)             (18.0)  
Point Lisas Nitrogen Limited (PLNL) | Foreign Tax Authority                
Operating Loss Carryforwards [Line Items]                
Change in enacted tax rate           $ 12.0 $ 6.0  
Canada Revenue Agency | State Tax Authority | Tax Years 2006-2011                
Operating Loss Carryforwards [Line Items]                
State income taxes, net of federal         9.0      
Canada Revenue Agency | Foreign Tax Authority                
Operating Loss Carryforwards [Line Items]                
Additions for tax positions taken during prior years         154.0      
Payments for other taxes 267.0 $ 363            
Canada Revenue Agency | Foreign Tax Authority | Tax Years 2006-2011                
Operating Loss Carryforwards [Line Items]                
Liability (refund) adjustment from settlement with taxing authority (129.0)     (129.0) (129.0)      
Foreign tax contingency         78.0      
Interest on income taxes accrued 102.0     102.0 102.0      
Income taxes paid       224.0        
Her Majesty's Revenue and Customs (HMRC) | Foreign Tax Authority                
Operating Loss Carryforwards [Line Items]                
Tax credit carryforward valuation allowance $ 24.0     $ 24.0 $ 24.0      
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