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Debt - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 03, 2017
Apr. 22, 2016
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
BIVIVP            
Business Acquisition [Line Items]            
Total consideration transferred — net of cash acquired $ 882.1   $ 882.1      
Revenues         $ 216.7  
Unaudited pro forma combined revenues         $ 2,890.0 $ 3,140.0
Galliprant            
Business Acquisition [Line Items]            
Total consideration transferred — net of cash acquired   $ 88.6        
Upfront payment   45.0        
Contingent consideration   $ 43.6        
Galliprant | Development and Success-based Regulatory Milestones            
Business Acquisition [Line Items]            
Amount eligible to receive       $ 8.0    
Galliprant | Potential Sales-based Milestones            
Business Acquisition [Line Items]            
Amount eligible to receive       60.0    
Payment related to sales-based milestone       $ 15.0