v3.26.3
Assets Held for Sale and Idle Facilities (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 19, 2025
USD ($)
Sep. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Long-Lived Asset, Held-for-Sale [Line Items]              
Inventories   $ 3,224.0     $ 3,224.0   $ 3,363.0
Impairment of Long-Lived Assets to be Disposed of         238.8 $ 73.0  
Asset retirement obligations   2,281.4     2,281.4   2,330.6
Deferred Proceeds from Sale of Assets $ 10.0 10.0     10.0    
Proceeds from Sale of Property, Plant, and Equipment         34.7 $ 6.0  
Idled Assets Carrying Value   0.0     0.0    
Property, plant and equipment, net of accumulated depreciation   $ 13,577.3     $ 13,577.3   13,982.6
Kronau Land Area Subject To Sale   11,858     11,858    
Long Lived Asset, Held For Sale Carrying Amount   $ 10.0     $ 10.0    
Patrocinio              
Long-Lived Asset, Held-for-Sale [Line Items]              
Accelerated Depreciation   0.0     52.0    
Operating Expenses     $ 159.0        
Contract Termination Costs     72.0        
Long-Lived Asset, Held and Used, Impairment Loss     56.0        
Inventory Write-down     21.0        
Severance Costs     10.0        
Care and Maintenance Expense   14.0     51.0    
Carlsbad              
Long-Lived Asset, Held-for-Sale [Line Items]              
Impairment of Long-Lived Assets to be Disposed of       $ 185.0      
Disposal Group, Including Discontinued Operation, Assets, Current             73.5
Disposal Group, Including Discontinued Operation, Liabilities, Current             55.3
Proceeds from Sale of Property, Plant, and Equipment         2.0    
Proceeds from the sale of an asset $ 20.0            
Accounts Receivables, Inventory and Other Assets, Net             74.4
Replacement Surety Bonds, Amount         82.0    
Guarantor Obligations, Maximum Exposure, Undiscounted   50.0     50.0    
Asset, Impairment Loss   6.2   $ 185.0 191.2    
Property, plant and equipment, net of accumulated depreciation             $ 184.1
Araxa              
Long-Lived Asset, Held-for-Sale [Line Items]              
Impairment of Long-Lived Assets to be Disposed of         (232.6)    
Disposal Group, Including Discontinued Operation, Assets, Current   96.6     96.6    
Accounts Payable and Accrued Liabilities, Current   12.6     12.6    
Asset retirement obligations   64.3     64.3    
Disposal Group, Including Discontinued Operation, Liabilities, Current   76.9     76.9    
Asset, Impairment Loss   0.0 $ 233.0        
Property, plant and equipment, net of accumulated depreciation   $ 329.2     329.2    
Kronau              
Long-Lived Asset, Held-for-Sale [Line Items]              
Proceeds from Sale of Property, Plant, and Equipment         $ 36.0