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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, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Operating Loss Carryforwards [Line Items]            
Less: Net earnings attributable to noncontrolling interest       $ 313.0 $ 591.0 $ 343.0
Transfer pricing arbitration       0.0 69.0 0.0
State income taxes, net of federal       44.0 143.0 34.0
Income tax expense (benefit)       (410.0) (1,158.0) (283.0)
Undistributed earnings $ 12.0   $ 12.0 9.0 12.0  
State tax credits 7.0   7.0 16.0 7.0  
Tax credit carryforward decrease during period           27.0
Tax credit carryforwards not expected to be realized 18.0   18.0   18.0  
Additions for tax positions taken during prior years       69.0 154.0  
Unrecognized tax benefits 181.0   181.0 222.0 181.0 27.0
Unrecognized tax benefits that would impact effective tax rate 29.0   29.0   29.0  
Additions for tax positions taken during the current year       5.0 0.0  
Reductions related to settlements with tax jurisdictions       33.0 0.0 59.0
Interest expense and penalties related to potential income taxes       (4.0) 66.0  
Deferred Tax Assets, Valuation Allowance 190.0   190.0 194.0 190.0  
Interest expense and penalties            
Interest expense and penalties related to potential income taxes       (4.0) 66.0  
Accrued interest expense and penalties            
Amount recognized in consolidated balance sheets for accrued interest and penalties related to income taxes 62.0   62.0 51.0 62.0  
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)
State Tax Authority            
Operating Loss Carryforwards [Line Items]            
Liability (refund) adjustment from settlement with taxing authority           12.0
Operating loss carryforwards       66.0    
Additions for tax positions taken during the current year           $ 5.0
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration       32.0    
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration       34.0    
Foreign Tax Authority            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards       116.0    
Tax credit carryforward valuation allowance 44.0   44.0   44.0  
Unrecognized tax benefits increase in period         26.0  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       11.0    
Deferred Tax Assets, Valuation Allowance       55.0    
Foreign Tax Authority | UNITED KINGDOM            
Operating Loss Carryforwards [Line Items]            
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       (7.0)    
Domestic Tax Authority            
Operating Loss Carryforwards [Line Items]            
Income taxes receivable 51.0   51.0   51.0  
State and Local Jurisdiction and Foreign Tax Authority            
Operating Loss Carryforwards [Line Items]            
Decrease resulting from prior period tax positions       33.0    
Point Lisas Nitrogen Limited (PLNL) | Foreign Tax Authority            
Operating Loss Carryforwards [Line Items]            
Change in enacted tax rate         12.0  
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       $ 74.0 154.0  
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