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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 11, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net income from discontinued operations   $ 0.0 $ 3,680.5
Gain related to disposition   0.0 $ 3,680.5
Elanco | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue   580.0  
Net income from discontinued operations   3,680.0  
Gain related to disposition   $ 3,700.0  
Transitional services agreement, term 24 months    
Eli Lilly And Company | Elanco | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposition of ownership interest 80.20%