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Discontinued Operations (Discontinued Operations in Financial Statements) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue $ 5,636.7 $ 5,585.0 $ 10,728.9 $ 10,548.8
Net income (loss) from discontinued operations 0.0 (28.3) 3,680.5 21.9
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]        
Revenue $ 0.0 $ 770.2 $ 580.0 $ 1,506.4