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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2018
Oct. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Settlements         $ (35,700,000)
Employer matching contribution percentage     80.00%    
Maximum percentage of employee's compensation eligible for employer matching contributions     5.00%    
Additional employer annual contribution percentage     5.00%    
Charges for defined contribution plans     $ 15,300,000 $ 15,000,000.0 9,700,000
UNITED STATES          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Settlements         $ (3,200,000)
Expected return on plan assets 4.50% 5.00% 4.25%   6.50%
Decrease in rate of return on plan assets     0.75%    
Estimated inflation rate assumptions for rate of return on plan assets     2.10%    
UNITED STATES | Fixed Income Investments          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Target asset allocation     100.00%    
UNITED KINGDOM          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Settlements         $ (32,500,000)
Discontinued Operations, Held-for-sale | FMC Health and Nutrition          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Pension curtailment charge       3,900,000 3,900,000
Pensions          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accumulated benefit obligation $ 1,248,800,000   $ 1,364,200,000 1,248,800,000  
Net actuarial (gain) loss that will be amortized from AOCI into net annual benefit cost (income) during 2014     9,800,000    
Prior service cost (credit) that will be amortized from AOCI into net annual benefit cost (income) during 2014     200,000    
Curtailment loss and special termination benefits       4,300,000 $ 4,300,000
Settlements     $ (3,500,000) $ (4,400,000)  
Expected return on plan assets     4.25% 5.00% 6.50%
Other Benefits          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Net actuarial (gain) loss that will be amortized from AOCI into net annual benefit cost (income) during 2014     $ (900,000)    
Prior service cost (credit) that will be amortized from AOCI into net annual benefit cost (income) during 2014     0    
Settlements     $ 0 $ 0  
Expected return on plan assets     0.00% 0.00% 0.00%