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Retirement Benefits - Schedule of Expected Benefit Payments (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
renewal_term
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]          
Payable to Lilly (Note 19) $ 0.0   $ 268.7 $ 0.0  
Net transfers (to)/from Lilly   $ (69.2) [1] (226.3) 873.3 $ (129.2)
Acquisition amount     0.0 882.1 45.0
Boehringer Ingelheim Vetmedica, Inc.          
Related Party Transaction [Line Items]          
Acquisition amount       882.1  
Lilly          
Related Party Transaction [Line Items]          
Payable to Lilly (Note 19)     66.0    
Stock-based compensation $ 5.1 6.9 26.0 25.0 20.4
Costs/(benefits) of defined benefit pension plan   0.6 (6.3) 73.7 11.3
Lilly | MSA          
Related Party Transaction [Line Items]          
Total net assets     95.6    
Restricted cash retained     $ 202.7    
Lilly | TSA          
Related Party Transaction [Line Items]          
Mark-up rate 7.00%   7.00%    
Revenue from related parties     $ 28.0    
Lilly | Intellectual Property and Technology License Agreement          
Related Party Transaction [Line Items]          
Initial term     2 years    
Number of renewal terms | renewal_term     3    
Extension term     1 year    
Lilly | Toll Manufacturing Arrangement          
Related Party Transaction [Line Items]          
Revenue from related parties     $ 7.0    
Lilly | Manufacturing Support          
Related Party Transaction [Line Items]          
Revenue from related parties   $ 1.2 3.7 6.2 5.5
Director | Commercial Operations          
Related Party Transaction [Line Items]          
Revenue from related parties     23.5 24.8 14.3
Accounts receivable     2.5 2.0  
Purchases of goods and services     3.9 5.9 $ 7.1
Accounts payable     0.7 $ 0.4  
IPO          
Related Party Transaction [Line Items]          
Amount transferred to parent $ 4,200.0   $ 4,200.0    
[1] See Note 15: Related Party Agreements and Transactions for further discussion.