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Related Party Agreements and Transactions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]          
Net transfers (to)/from Lilly   $ (69.2) [1] $ (226.3) $ 873.3 $ (129.2)
Net capital contributions from/(distributions to) Lilly [1] $ (7.0)        
Lilly          
Related Party Transaction [Line Items]          
Stock-based compensation $ 5.1 6.9 26.0 25.0 20.4
Costs of defined benefit pension plan   0.6 $ (6.3) 73.7 11.3
Lilly | TSA          
Related Party Transaction [Line Items]          
Mark-up rate 7.00%   7.00%    
Revenue from related parties     $ 28.0    
Lilly | Manufacturing Support          
Related Party Transaction [Line Items]          
Revenue from related parties   1.2 3.7 $ 6.2 $ 5.5
Director | Other activities          
Related Party Transaction [Line Items]          
Revenue from related parties $ 4.2 5.5      
Accounts receivable 1.2   2.5    
Purchases of goods and services 1.5 $ 0.8      
Accounts payable $ 0.9   $ 0.7    
[1] See Note 15: Related Party Agreements and Transactions for further discussion.