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Environmental Obligations - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
site
operable_unit
party
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 1998
USD ($)
Dec. 31, 2019
USD ($)
Environmental Exit Cost [Line Items]          
Environmental reserves, excluding recoveries $ 543.1 $ 514.6      
Environmental loss contingencies, net of expected recoveries, in excess of accrual 200.0        
Accrual for environmental loss contingencies 529.2 503.2 $ 564.4   $ 585.8
Charges to expense for new losses 104.8 65.8 53.2    
Payments for attorney fees and unpaid permit fees $ 74.5 121.8 $ 81.1    
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 47        
Middleport Litigation          
Environmental Exit Cost [Line Items]          
Settlement payment $ 11.7 14.2      
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 75.8 79.3      
Tribal permit fee       $ 1.5  
Charges to expense for new losses $ 31.5        
Discount rate 4.14%        
Estimated year three fees $ 1.5        
Expected aggregate undiscounted fees 75.0        
Middleport          
Environmental Exit Cost [Line Items]          
Accrual for environmental loss contingencies $ 108.2 $ 114.5