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Financial Instruments and Fair Value - Narrative (Details)
SFr in Millions, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
CHF (SFr)
Dec. 31, 2018
USD ($)
Oct. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Disclosures [Abstract]        
Cost and equity method investments   $ 15.3   $ 12.3
Net Investment Hedging | Designated as Hedging Instrument | Foreign Exchange Contract        
Business Acquisition, Contingent Consideration [Line Items]        
Derivative, term of contract 5 years      
Notional amount | SFr SFr 750      
Expected cash and contra interest per year     $ 25.0  
Loss to AOCI, net of tax   5.9    
Net Investment Hedging | Designated as Hedging Instrument | Foreign Exchange Contract | Interest Expense        
Business Acquisition, Contingent Consideration [Line Items]        
Contra interest expense   5.6    
Amortized Cost        
Business Acquisition, Contingent Consideration [Line Items]        
Long term debt   2,500.0    
Galliprant        
Business Acquisition, Contingent Consideration [Line Items]        
Contingent consideration   37.6    
Galliprant | Potential Sales-based Milestones        
Business Acquisition, Contingent Consideration [Line Items]        
Payment related to sales-based milestone   $ 15.0