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Discontinued Operations (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 11, 2019 | Sep. 24, 2018 | Aug. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain related to disposition |  |  |  |  | $ 0.0 | $ 3,680.5 | $ 0.0
Elanco |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Consideration received |  | $ 4,200.0 |  |  |  |  |
Additional paid in capital |  | 629.2 |  |  |  |  |
Elanco | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain related to disposition |  |  |  | $ 3,700.0 |  |  |
Cash provided by operating activities, discontinued operations |  |  |  |  |  |  | $ 500.0
Transitional services agreement, term | 24 months |  |  |  |  |  |
Elanco | Discontinued Operations, Disposed of by Sale | Eli Lilly and Company |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposition of ownership interest | 80.20% |  |  |  |  |  |
Elanco |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 2,000.0 |  |  |  |  |
Elanco | Term Facility |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 500.0 |  |  |  |
Debt instrument, term |  |  | 3 years |  |  |  |
IPO | Elanco |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Initial public offering (in shares) |  | 72.3 |  |  |  |  |
Percentage of stock sold |  | 19.80% |  |  |  |  |
Sale of stock, price per share (in usd per share) |  | $ 24 |  |  |  |  |

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