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Pensions and Other Postretirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Components of net annual benefit cost (income):          
Voluntary cash contributions made to U.S. defined benefit pension plan     $ 24,000,000 $ 21,000,000  
FMC Health and Nutrition | Discontinued Operations, Held-for-sale          
Components of net annual benefit cost (income):          
Curtailment loss     3,900,000 0  
Pensions          
Components of net annual benefit cost (income):          
Service cost $ 1,700,000 $ 2,500,000 3,800,000 4,900,000  
Interest cost 11,100,000 12,500,000 22,500,000 24,900,000  
Expected return on plan assets (19,800,000) (21,500,000) (39,700,000) (42,900,000)  
Amortization of prior service cost (credit) 100,000 200,000 300,000 400,000  
Recognized net actuarial and other (gain) loss 3,800,000 10,100,000 7,800,000 20,400,000  
Recognized loss due to settlement 800,000 0 800,000 0  
Net periodic benefit cost (2,300,000) 3,800,000 (4,500,000) 7,700,000  
Other Benefits          
Components of net annual benefit cost (income):          
Service cost 0 0 0 0  
Interest cost 200,000 200,000 400,000 400,000  
Expected return on plan assets 0 0 0 0  
Amortization of prior service cost (credit) 0 0 0 0  
Recognized net actuarial and other (gain) loss (200,000) (300,000) (500,000) (500,000)  
Recognized loss due to settlement 0 0 0  
Net periodic benefit cost $ 0 $ (100,000) $ (100,000) $ (100,000)  
U.S. defined benefit pension plan | Scenario, Forecast          
Components of net annual benefit cost (income):          
Voluntary cash contributions made to U.S. defined benefit pension plan         $ 40,000,000