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Acquisitions and Divestitures - Summary of Amounts Recognized for Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Jul. 31, 2019
Jul. 18, 2019
Jun. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill     $ 3,044.0 $ 2,989.6
Aratana        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 26.4    
Inventories   10.3    
Other assets and liabilities - net   4.1    
Total identifiable net assets   122.6    
Goodwill   30.7    
Settlement of existing contingent consideration liabilities   84.7    
Total consideration transferred   $ 238.0    
Average useful life   12 years 6 months    
Aratana | Marketed products        
Business Acquisition [Line Items]        
Finite lived intangibles   $ 36.7    
Aratana | Other intangible assets        
Business Acquisition [Line Items]        
Finite lived intangibles   13.2    
Aratana | In-Process Research and Development        
Business Acquisition [Line Items]        
Acquired in-process research and development   $ 31.9    
Prevtec        
Business Acquisition [Line Items]        
Cash and cash equivalents $ 0.9      
Property and equipment 0.5      
Other assets and liabilities - net (9.3)      
Total identifiable net assets 54.9      
Goodwill 10.1      
Total consideration transferred $ 65.0      
Average useful life 10 years      
Prevtec | Marketed products        
Business Acquisition [Line Items]        
Finite lived intangibles $ 58.9      
Prevtec | Other intangible assets        
Business Acquisition [Line Items]        
Finite lived intangibles 1.1      
Prevtec | In-Process Research and Development        
Business Acquisition [Line Items]        
Acquired in-process research and development $ 2.8