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Environmental Obligations - Narrative (Details)
$ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Nov. 15, 2019
USD ($)
Sep. 28, 2017
USD ($)
Apr. 25, 2006
USD ($)
Feb. 25, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
operable_unit
site
party
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 1998
USD ($)
Dec. 31, 2017
USD ($)
Environmental Exit Cost [Line Items]                        
Environmental reserves, excluding recoveries         $ 595.8     $ 574.7 $ 595.8      
Environmental loss contingencies, net of expected recoveries, in excess of accrual               170.0        
Accrual for environmental loss contingencies         585.8 $ 521.5   564.4 585.8 $ 521.5   $ 411.8
Charges to expense for new losses               53.2 138.8 178.2    
Payments for attorney fees and unpaid permit fees               $ 81.1 73.8 65.7    
Number of operable units evaluated and proposed for CMAs | operable_unit               6        
Number of sites FMC is named as a potentially responsible party | site               29        
Number of sites FMC may be a potentially responsible party or equivalent | site               47        
Non-judicial process, parties involved | party               70        
Middleport Litigation                        
Environmental Exit Cost [Line Items]                        
Settlement payment               $ 17.9 22.2      
Pending Litigation | Middleport Litigation                        
Environmental Exit Cost [Line Items]                        
Accrual for environmental loss contingencies           29.1       29.1    
Charges to expense for new losses           106.3            
Operable units | operable_unit               11        
Cash outflow, maximum, after year 2021               $ 10.0        
Minimum | Pending Litigation | Middleport Litigation                        
Environmental Exit Cost [Line Items]                        
Cash outflow in 2020               20.0        
Cash outflow in 2020               20.0        
Maximum | Pending Litigation | Middleport Litigation                        
Environmental Exit Cost [Line Items]                        
Cash outflow in 2020               30.0        
Cash outflow in 2020               30.0        
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       $ 31.1    
Pocatello                        
Environmental Exit Cost [Line Items]                        
Accrual for environmental loss contingencies         107.5     117.8 107.5      
Tribal permit fee   $ 1.5 $ 1.5               $ 1.5  
Charges to expense for new losses $ 72.8       72.8     $ 82.6        
Discount rate               1.45%        
Estimated year one fees               $ 32.2        
Estimated year two fees               1.5        
Estimated year three fees               1.5        
Estimated year four fees               1.5        
Estimated year five fees               1.5        
Expected aggregate undiscounted fees               104.5        
Pocatello | Subsequent Event                        
Environmental Exit Cost [Line Items]                        
Payments for attorney fees and unpaid permit fees       $ 20.5                
Past years' permit fees             $ 10.5          
Middleport                        
Environmental Exit Cost [Line Items]                        
Accrual for environmental loss contingencies         $ 159.4     $ 142.7 $ 159.4