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Environmental Obligations - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 156 Months Ended
Nov. 15, 2019
USD ($)
Sep. 28, 2017
USD ($)
Apr. 25, 2006
USD ($)
Apr. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
operable_unit
party
site
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 1998
USD ($)
Dec. 31, 2014
USD ($)
Environmental Exit Cost [Line Items]                      
Environmental reserves, excluding recoveries         $ 574.7   $ 514.6 $ 574.7      
Environmental loss contingencies, net of expected recoveries, in excess of accrual             160.0        
Accrual for environmental loss contingencies         564.4 $ 521.5 503.2 564.4 $ 585.8    
Charges to expense for new losses             65.8 53.2 138.8    
Payments for attorney fees and unpaid permit fees             $ 121.8 81.1 $ 73.8    
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             47        
Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Settlement payment             $ 14.2 17.9      
Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies           29.1          
Charges to expense for new losses           106.3          
Operable units | operable_unit             11        
Cash outflow, maximum, after year 2021             $ 10.0        
Environmental Remediation Costs | Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Charges to expense for new losses           60.6          
Implementation and Completion of Selected Remedy | Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Charges to expense for new losses           45.7          
Environmental Clean-Up Costs | Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies           $ 31.1          
Pocatello                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies         117.8   79.3 117.8      
Tribal permit fee   $ 1.5 $ 1.5             $ 1.5  
Charges to expense for new losses $ 72.8       72.8   47.7        
Payments for attorney fees and unpaid permit fees       $ 10.8     $ 32.2       $ 21.4
Discount rate             1.94%        
Estimated year three fees             $ 1.5        
Expected aggregate undiscounted fees             75.0        
Middleport                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies         $ 142.7   $ 114.5 $ 142.7