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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average remaining contractual term of the exercisable options 9 years 9 months 18 days    
Exercisable options, aggregate intrinsic value (usd per share) $ 0.08    
Lilly's Stock-Based Compensation Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 26.0 $ 25.0 $ 20.4
Lilly's Stock-Based Compensation Program | PAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Fair value granted (usd per share) $ 71.63 $ 73.54 $ 72.00
Number of shares issued (in shares) 39,771 69,144 20,329
Unrecognized compensation cost $ 5.8    
Weighted-average remaining requisite service period 12 months    
Lilly's Stock-Based Compensation Program | SVAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Fair value granted (usd per share) $ 49.38 $ 66.25 $ 48.68
Number of shares issued (in shares) 30,195 35,063 36,071
Unrecognized compensation cost $ 3.5    
Weighted-average remaining requisite service period 20 months    
Lilly's Stock-Based Compensation Program | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Fair value granted (usd per share) $ 70.95 $ 72.47 $ 71.46
Number of shares issued (in shares) 82,025 57,224 26,468
Unrecognized compensation cost $ 12.5    
Weighted-average remaining requisite service period 20 months    
Elanco Stock Compensation Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 1.8    
Related tax benefits $ 0.4    
Elanco Stock Compensation Plans | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Fair value granted (usd per share) $ 31.09    
Number of shares issued (in shares) 18,991    
Unrecognized compensation cost $ 3.9    
Weighted-average remaining requisite service period 33 months    
Number of shares granted (in shares) 158,007    
Elanco Stock Compensation Plans | Stock Option Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Exercise price for stock option, percent 100.00%    
Expiration period 10 years