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Environmental Obligations Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 28, 2017
USD ($)
May 08, 2012
USD ($)
Apr. 25, 2006
USD ($)
Dec. 31, 2018
USD ($)
site
Dec. 31, 2018
USD ($)
site
party
operable_unit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2013
operable_unit
Dec. 31, 1998
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2015
USD ($)
Environmental Exit Cost [Line Items]                      
Environmental reserves, excluding recoveries       $ 529.4 $ 529.4 $ 425.7          
Environmental loss contingencies, net of expected recoveries, in excess of accrual         190.0            
Accrual for environmental loss contingencies       $ 521.5 $ 521.5 411.8 $ 360.4       $ 334.3
Number of operable units evaluated and proposed for CMAs | operable_unit         5            
Number of operable units selected for CMAs | operable_unit               3      
Charges to expense for new losses         $ 178.2 105.6 $ 80.8        
Number of sites FMC is named as a potentially responsible party | site       32 32            
Number of sites FMC may be a potentially responsible party or equivalent | site       53 53            
Non-judicial process, parties involved | party         70            
Pocatello                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies       $ 33.1 $ 33.1 35.2          
Tribal permit fee $ 1.5 $ 1.5 $ 1.5           $ 1.5    
Tribal court decision on permit fees   $ 9.0                  
Middleport                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies       180.8 $ 180.8 $ 73.9          
Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Accrual for environmental loss contingencies                   $ 29.1  
Operable units | operable_unit         11            
Charges to expense for new losses       106.3              
Cash outflow, maximum, after year 2021       10.0 $ 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  
Minimum | Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Cash outflow in 2019       20.0 20.0            
Cash outflow in 2020       20.0 20.0            
Cash outflow in 2021       20.0 20.0            
Maximum | Pending Litigation | Middleport Litigation                      
Environmental Exit Cost [Line Items]                      
Cash outflow in 2019       30.0 30.0            
Cash outflow in 2020       30.0 30.0            
Cash outflow in 2021       $ 30.0 $ 30.0