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Environmental Obligations - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
site
operable_unit
party
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 1998
USD ($)
Dec. 31, 2021
USD ($)
Environmental Exit Cost [Line Items]          
Environmental reserves, excluding recoveries $ 623.2 $ 601.8      
Environmental loss contingencies, net of expected recoveries, in excess of accrual 290.0        
Accrual for environmental loss contingencies 613.1 592.1 $ 529.2   $ 503.2
Charges to expense for new losses $ 116.0 152.3 $ 104.8    
Number of operable units evaluated and proposed for CMAs | operable_unit 6        
Non-judicial process, parties involved | party 100        
Number of sites FMC is named as a potentially responsible party | site 28        
Number of sites FMC may be a potentially responsible party or equivalent | site 45        
Middleport Litigation          
Environmental Exit Cost [Line Items]          
Settlement payment $ 10.0 12.5      
Pending Litigation | Middleport Litigation          
Environmental Exit Cost [Line Items]          
Operable units | operable_unit 11        
Cash outflow, maximum, after year 2021 $ 10.0        
Pocatello          
Environmental Exit Cost [Line Items]          
Accrual for environmental loss contingencies 115.9 82.9      
Charges to expense for new losses $ 28.0        
Tribal permit fee       $ 1.5  
Discount rate 4.86%        
Estimated year three fees $ 1.5        
Expected aggregate undiscounted fees 75.0        
Middleport          
Environmental Exit Cost [Line Items]          
Accrual for environmental loss contingencies $ 128.5 $ 130.8