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Discontinued Operations Results of Operations (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations of FMC Lithium, net of income taxes |  | $ (122.1) | $ 23.9 | $ 32.7 | $ 39.4 | $ 770.5 | $ 13.6 | $ 38.8 | $ (151.4) | $ (26.1) | $ 671.5 | $ 138.3
Discontinued operations, net of income taxes, attributable to FMC Stockholders |  | $ (125.3) | $ 23.9 | $ 32.7 | $ 39.4 | $ 770.6 | 13.5 | $ 38.7 | $ (151.3) | (29.3) | 671.5 | 138.0
Restructuring and other charges (income) |  |  |  |  |  |  |  |  |  | 61.2 | 73.2 | 94.2
FMC Lithium |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations of FMC Lithium, net of income taxes |  |  |  |  |  |  |  |  |  | 117.3 | 49.8 | 57.3
Discontinued operations of FMC Health and Nutrition, net of income tax benefit (expense) of ($7.1), ($180.1) and ($43.8), respectively |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operations of FMC Lithium, net of income taxes |  |  |  |  |  |  |  |  |  | 6.0 | 683.3 | 114.7
Discontinued Operations, Disposed of by Sale | FMC Lithium |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 442.5 | 347.4 | 264.1
Costs of sales and services |  |  |  |  |  |  |  |  |  | 235.4 | 197.9 | 175.7
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  |  | 170.9 | 85.0 | 69.2
Provision for income taxes |  |  |  |  |  |  |  |  |  | 25.5 | 35.2 | 11.9
Total discontinued operations of FMC Health and Nutrition, net of income taxes, before divestiture related costs and adjustments |  |  |  |  |  |  |  |  |  | 145.4 | 49.8 | 57.3
Separation-related costs of discontinued operations of FMC Lithium, net of income taxes |  |  |  |  |  |  |  |  |  | (28.1) | 0.0 | 0.0
Discontinued operations of FMC Lithium, net of income taxes |  |  |  |  |  |  |  |  |  | 117.3 | 49.8 | 57.3
Less: Discontinued operations of FMC Lithium attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 3.2 | 0.0 | 0.0
Discontinued operations, net of income taxes, attributable to FMC Stockholders |  |  |  |  |  |  |  |  |  | 114.1 | 49.8 | 57.3
Restructuring and other charges (income) |  |  |  |  |  |  |  |  |  | 2.5 | 8.2 | 0.8
Pension settlement charges (income) |  |  |  |  |  |  |  |  |  | 4.3 | 34.5 | (0.4)
Discontinued Operations, Held-for-sale or Disposed of by Sale | Discontinued operations of FMC Health and Nutrition, net of income tax benefit (expense) of ($7.1), ($180.1) and ($43.8), respectively |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 3.8 | 562.9 | 743.5
Costs of sales and services |  |  |  |  |  |  |  |  |  | 4.0 | 370.5 | 474.9
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  |  | 2.0 | 113.7 | 158.5
Provision for income taxes |  |  |  |  |  |  |  |  |  | 3.8 | 9.7 | 43.8
Total discontinued operations of FMC Health and Nutrition, net of income taxes, before divestiture related costs and adjustments |  |  |  |  |  |  |  |  |  | (1.8) | 104.0 | 114.7
Gain on sale of FMC Health and Nutrition, net of income taxes | $ 727.0 |  |  |  |  |  |  |  |  | 0.0 | 727.1 | 0.0
Adjustment to gain on sale of FMC Health and Nutrition, net of income taxes |  |  |  |  |  |  |  |  |  | 7.8 | 0.0 | 0.0
Adjustment to FMC Health and Nutrition Omega-3 net assets held for sale, net of income taxes |  |  |  |  |  |  |  |  |  | 0.0 | (147.8) | 0.0
Discontinued operations, net of income taxes, attributable to FMC Stockholders |  |  |  |  |  |  |  |  |  | 6.0 | 683.3 | 114.7
Impairment charge, net of tax |  |  |  |  |  |  |  |  |  | $ 0.0 | 147.8 | 0.0
Discontinued Operations, Held-for-sale | Discontinued operations of FMC Health and Nutrition, net of income tax benefit (expense) of ($7.1), ($180.1) and ($43.8), respectively |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to FMC Health and Nutrition Omega-3 net assets held for sale, net of income taxes |  |  |  |  |  |  |  |  |  |  | (148.0) |
Allocated interest expense |  |  |  |  |  |  |  |  |  |  | 16.6 | 19.8
Restructuring and other charges (income) |  |  |  |  |  |  |  |  |  |  | 8.1 | $ 12.3
Pension curtailment charge |  |  |  |  |  |  |  |  |  |  | 3.9 |
Divestiture related costs |  |  |  |  |  |  | 27.9 |  |  |  |  |
Incremental tax cost |  |  |  |  |  |  | $ 14.7 |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 168.0 |
Impairment charge, net of tax |  |  |  |  |  |  |  |  |  |  | $ 148.0 |

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