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Fair Value Measurements (Details Textual)
SFr in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2006
CHF (SFr)
Business Acquisition, Contingent Consideration [Line Items]                
Asset impairment charges         $ 0.0      
Fair value measurements, changes in valuation inputs         0      
Notes payable   $ 5,931.1     $ 5,931.1   $ 5,938.2  
Contingent consideration obligations   330.5     330.5   279.0  
Future payment   0.0   $ 0.0 20.0 $ 6.7    
Notes Payable To Fumedica                
Business Acquisition, Contingent Consideration [Line Items]                
Notes payable   $ 0.0     $ 0.0   3.2 SFr 61.4
2.900% Senior Notes due 2020                
Business Acquisition, Contingent Consideration [Line Items]                
Senior Notes interest rate   2.90%     2.90%      
Notes payable   $ 1,476.2     $ 1,476.2   1,482.4  
3.625% Senior Notes due 2022                
Business Acquisition, Contingent Consideration [Line Items]                
Senior Notes interest rate   3.625%     3.625%      
Notes payable   $ 995.2     $ 995.2   994.3  
4.050% Senior Notes due 2025                
Business Acquisition, Contingent Consideration [Line Items]                
Senior Notes interest rate   4.05%     4.05%      
Notes payable   $ 1,737.4     $ 1,737.4   1,736.3  
5.200% Senior Notes due 2045                
Business Acquisition, Contingent Consideration [Line Items]                
Senior Notes interest rate   5.20%     5.20%      
Notes payable   $ 1,722.3     $ 1,722.3   $ 1,722.0  
Ionis Pharmaceuticals                
Business Acquisition, Contingent Consideration [Line Items]                
Term of collaboration agreement     10 years          
Expected contingent milestone payment                
Business Acquisition, Contingent Consideration [Line Items]                
Future payment $ (81.5)