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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 11, 2019
Jun. 30, 2019
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on disposition of business   $ 3,680.5 $ 0.0
Elanco Animal Health Incorporated | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Noncontrolling interest, ownership percentage by parent 80.20%    
Gain on disposition of business   $ 3,700.0  
Transitional services agreement, term 24 months