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Discontinued Operations - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 01, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 01, 2019 | Aug. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net pretax actuarial gain and prior service credit |  | $ 4.4 | $ 5.2 |  |  |
After-tax actuarial gain and prior service credit |  | 3.6 | 4.2 |  |  |
Payments of other discontinued reserves |  | 29.9 | 24.4 | $ 27.8 |  |
Workers’ compensation, product liability, and indemnification reserves |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Payments of other discontinued reserves |  | 1.0 | 3.8 | 5.4 |  |
Postretirement medical and life insurance benefits reserve, net |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Payments of other discontinued reserves |  | 0.5 | 0.4 | 1.1 |  |
Reserves for legal proceedings |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Payments of other discontinued reserves |  | 28.4 | 20.2 | 21.3 |  |
Discontinued Operations, Disposed of by Sale | Omega 3 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash proceeds on sale |  |  |  |  |  | $ 38.0
Discontinued Operations, Held-for-sale or Disposed of by Sale | FMC Health and Nutrition |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain from disposal, before tax | $ 918.0 |  |  |  |  |
Gain on sale of FMC Health and Nutrition, net of income taxes | $ 727.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |
Discontinued Operations, Held-for-sale | FMC Health and Nutrition |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transitional services period | 24 months |  |  |  |  |
Transitional services period, optional extension | 6 months |  |  |  |  |
Livent |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Shares of common stock owned (in shares) |  |  |  |  | 123 |

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